Fall yard clues

Fall is caching-and-shelter season. Squirrels pock the lawn burying acorns, skunks and raccoons tear at turf while grubs ride high, mushrooms flush after the first cool rains, and — most importantly for your house — mice, rats, and squirrels start probing for winter shelter. Fall is the season when outdoor clues most often predict an indoor problem, so a few of these are worth acting on quickly.

Common fall clues (64)

Animal Droppings Black Droppings on Your Patio: Rat, Mouse, Bat, or Bird? Black droppings on a patio most often come from mice, rats, or bats, with birds and squirrels as runners-up. Mouse droppings are about 1/4 inch with pointed ends, rat droppings run 1/2 to 3/4 inch with blunt ends, and bat droppings look mouse-sized but crumble into shiny insect fragments. Where the droppings sit — piled under the eaves versus scattered along a wall — narrows it down fast. Read the guide → Lawn Problems Brown Patches in Grass: How to Read What Killed the Turf Brown patches in your grass are most often caused by fungal disease, white grubs eating the roots, dog urine, or summer drought dormancy. The pattern is the diagnosis: circles point to fungus, turf that lifts like carpet points to grubs, and small spots ringed with dark green grass point to dog urine. Read the guide → Yard Holes Dirt Mounds in Lawn: Mole, Gopher, or Ant? Read the Shape The shape of a dirt mound is the fastest identification tool in the yard: moles build round volcano-shaped mounds with no visible hole, pocket gophers build fan- or crescent-shaped mounds with a plugged hole to one side, and ants, earthworms, and digger bees leave much smaller piles. Match your mound to one of those shapes and you've usually named the animal. Read the guide → Lawn Problems Grass Torn Up in Patches Overnight: Who's Digging and Why Grass torn up in patches — especially damage that appears overnight — is almost always an animal digging for grubs under your turf. Raccoons flip and roll back chunks of sod, skunks drill small cone-shaped holes, and crows peck and pull tufts by day. The digger is the symptom; the grubs underneath are the cause. Read the guide → Yard Holes Holes in Your Lawn Overnight? What Digs While You Sleep Holes that appear in the lawn overnight are almost always the work of nocturnal foragers — skunks, raccoons, and in the South, armadillos — hunting for grubs and worms under your turf. The shape of the damage tells you who visited, and in many cases the real fix is dealing with the grubs that attracted them. Read the guide → Home Exterior Clues Scratching Noises in Walls at Night: What's Living in There? Scratching in your walls at night most often means mice or rats, since both are nocturnal — light, fast scratching suggests mice, while heavier gnawing and movement suggests rats. If the noise happens in daylight, especially at dawn and dusk, squirrels are the likelier tenant. The time of day, the weight of the sound, and where in the house it comes from will narrow it down before you ever see the animal. Read the guide → Yard Holes Small Holes in Yard With No Mound: What's Digging? Small holes in your yard with no dirt mound are usually caused by squirrels, chipmunks, foraging birds, earthworms, or ground-nesting insects. The size of the hole, how deep it goes, the time of year, and whether the damage appeared overnight can narrow down the cause quickly. Read the guide → Yard Holes Two-Inch Holes in Yard: Chipmunk, Rat, or Something Else? A round hole about two inches across is classic burrow size, and the usual suspects are chipmunks, rats, and thirteen-lined ground squirrels. Chipmunk holes are clean with no soil pile, rat holes are worn and hug structures, and ground squirrel holes sit in open, sunny lawn — those three clues sort out most cases. Read the guide → Mushrooms & Growths White Mushrooms in Your Lawn: Why They Appear, What to Do White mushrooms popping up in a lawn are the fruiting bodies of fungi that are already living in your soil, usually feeding on decomposing roots, old stumps, or thatch. They surge after rain or heavy watering, and in most cases they're a sign of biologically healthy soil — not a lawn disease. The main job is keeping kids and pets from eating them. Read the guide → Tracks, Nests & Outdoor Clues Animal Burrow Under Your Shed? Who's Living There A burrow entrance under your shed most likely belongs to a groundhog, skunk, rabbit, or rat, and the hole itself usually names the digger: groundhogs leave a 10–12 inch opening with a fan of excavated dirt, skunks announce themselves by smell, and rat holes are only 2–3 inches across. Before evicting anyone, check the calendar — from spring into midsummer there may be babies down there, and sealing them in creates a far worse problem than the burrow. Read the guide → Lawn Problems Ant Hills All Over the Lawn: Which Ants, and What to Do A lawn dotted with ant hills is usually hosting turfgrass ants or field ants, which are more of a mowing nuisance than a threat. The critical exception is in the southern US, where dome-shaped mounds with no visible entrance hole can be red imported fire ants — an aggressive, painfully stinging species that changes the response from 'rake and relax' to 'treat and keep kids away.' Read the guide → Plant Damage Bark Stripped From Trees: Squirrels, Deer, Voles, or Birds? The height of the damage tells you the most: bark gnawed at ground level is usually voles or rabbits, shredded bark from 1 to 4 feet up is deer rubbing their antlers, and stripped patches on upper branches point to squirrels. Neat horizontal rows of shallow holes are a sapsucker's work — and any damage that circles the whole trunk (girdling) puts the tree at real risk. Read the guide → Mushrooms & Growths Black Spots on Siding Near Mulch: Artillery Fungus Explained Tiny black dots speckling your siding just above a mulch bed are most likely spore masses from artillery fungus, a mulch-dwelling fungus that literally shoots its sticky spores toward light-colored surfaces — siding, cars, downspouts, and windows. The dots look like flecks of tar, stick like glue, and are notoriously difficult to remove once cured. Importantly, it isn't a mold growing on your house: the fungus lives in the wood mulch below, and the fix is changing the mulch, not treating the wall. Read the guide → Home Exterior Clues Black Streaks on Your Roof: Algae, Moss, or Something Worse? Black streaks running down your asphalt shingles are almost always a blue-green algae called Gloeocapsa magma — a cosmetic problem, not mold and not roof failure. The streaks show up first on north-facing and shaded slopes where moisture lingers, and they darken as the algae colony spreads year after year. Moss, lichen, and chimney soot can look similar, but each behaves differently and only moss actually threatens the shingles. Read the guide → Bugs & Eggs Brown Egg Sacs on Branches: Mantis, Lanternfly, or Moth? A brown egg case on a branch is either very good news or very bad news: praying mantis egg cases (oothecae) are beneficial and should be left alone, while spotted lanternfly and spongy moth egg masses are invasive pests you should destroy — and in many states, report. Texture and shape tell them apart, so identify before you scrape. Read the guide → Home Exterior Clues Chewed Wires and Screens: Rodent Damage and Fire Risk Chewed wires, cables, and window screens are almost always rodent work — mice, rats, or squirrels, whose front teeth grow continuously and must be worn down by gnawing. The size of the tooth marks and where the damage sits tells you which rodent, and chewed electrical wiring in particular is urgent: exposed conductors inside walls are a genuine fire hazard that needs both an electrician and a pest professional. Read the guide → Lawn Problems Dark Green Circles in Your Lawn: Fairy Rings and Other Causes A dark green circle or ring in your lawn is most often a fairy ring — an underground fungus releasing nitrogen as it grows outward — or grass feeding on something buried: a decomposing stump, old roots, spilled fertilizer, or a septic drain field line. Nearly all of these are cosmetic rather than a threat to the lawn. Read the guide → Animal Droppings Droppings in the Garage: Mouse, Rat, Bat, or Squirrel? Droppings in a garage are most often from mice, with rats, bats, and squirrels as the other usual suspects. Mouse droppings are 1/4-inch pellets with pointed ends scattered along walls and shelves; rat droppings are two to three times larger with blunt ends; bat droppings pile up in one spot beneath a roost near the ceiling or wall top. Before you identify anything, know the cleanup rule: never sweep or vacuum rodent droppings dry. Read the guide → Animal Droppings Droppings in Your Shed: Mouse, Rat, or Something Bigger? Mice are by far the most common source of droppings in a shed — look for 1/4-inch pellets with pointed ends scattered along walls, shelves, and inside boxes. Larger blunt-ended pellets suggest rats, droppings the size of a small dog's point to an opossum, and a smeared brown deposit with a chalky white cap means a snake has been hunting the rodents. Whatever you find, clean it up wet, not dry. Read the guide → Animal Droppings Droppings on Your Deck Railing: What's Running the Rails? Droppings on a deck railing are most often from mice, which treat railings as elevated highways between the yard and your house, leaving 1/4-inch pointed pellets scattered along the route. White splotches point to birds perching overhead, and a small pile of crumbly dark pellets beneath the eaves suggests a bat roost above. Where the droppings sit — spread along the rail versus piled in one spot — is your best first clue. Read the guide → Animal Droppings Droppings Under Your Deck: What Animal Is Denning There? Droppings under a deck usually mean an animal is using the space as a den, not just passing through — most often a skunk, opossum, feral cat, or raccoon, and occasionally a groundhog. Skunk droppings are crumbly and full of shiny insect parts, opossum droppings are large and curved, cat droppings are often buried in loose soil, and a pile of tubular droppings in one corner is a raccoon latrine that needs professional-level caution. Timing matters: from spring into midsummer, most of these animals have babies down there. Read the guide → Tracks, Nests & Outdoor Clues Feathers Scattered in Your Yard: What Happened Here? A patch of scattered feathers in your yard usually means one of three things: a hawk plucked a caught bird there, a cat made a kill, or a bird is simply molting. The pattern is the evidence — a dense circle of feathers with no body points to a hawk's plucking post, feathers plus a partially eaten bird points to a cat or a fox, and scattered single feathers appearing over days is just late-summer molt. Read the guide → Yard Holes Golf Ball-Size Holes in Your Yard: What Dug Them? A hole about the size of a golf ball — roughly 1.5 to 2 inches across — is classic burrow-entrance territory, most often chipmunks, ground squirrels, or rats. Where the hole sits, whether there's a soil pile beside it, and what part of the country you live in will usually settle which one it is. Read the guide → Home Exterior Clues Greasy Rub Marks Along Walls: The Sign of a Rodent Runway Dark, greasy smudges running in a line along your baseboards, foundation, pipes, or rafters are most likely rub marks — oil and dirt from rodent fur deposited as the animal follows the same route night after night. Prominent, continuous marks usually mean rats; smaller, fainter smudges mean mice. Because rub marks only build up through repeated travel, finding them means a runway is established, not that an animal passed through once. Read the guide → Bugs & Eggs Green Caterpillars on Plants: Which One Is Eating Yours? The green caterpillar on your plants is most likely a cabbage worm if it's on broccoli or kale, a tomato hornworm if it's large and has a tail spike, or a sawfly larva if it's on roses. Which plant is being eaten narrows it down fast, and handpicking plus row covers handle most of them — no spraying required. Keep in mind that some green caterpillars grow up to be butterflies worth keeping around. Read the guide → Animal Droppings Green Droppings on Your Lawn: Geese, Rabbits, or the Dog? Green droppings on a lawn are almost always from Canada geese — their waste is tubular, about 2 to 3 inches long, and green to greenish-brown because their diet is nearly all grass. Small round pellets with a green tint point to rabbits feeding on fresh spring growth, and a green-tinged pile of normal dog waste usually just means a dog that's been eating grass. If you live near a pond, lake, golf course, or park, geese are the answer most of the time. Read the guide → Yard Holes Holes Around Tree Roots: Squirrels, Voles, or Wasps? Holes at the base of a tree usually belong to squirrels burying and retrieving nuts, voles working the mulch line, or rats denning in the sheltered pocket under the root flare — and sometimes to nothing living at all, since decayed old roots leave open channels in the soil. The one to identify before you get close is a yellowjacket colony nesting in a hollow among the roots. Read the guide → Yard Holes Holes in Flower Beds Overnight? Meet the Night Shift Flower beds dug up overnight are almost always animals hunting food, not making homes: skunks and raccoons dig for grubs and worms in the soft soil, squirrels bury and retrieve nuts, cats use loose beds as litter boxes, and across the South armadillos root through beds nose-first. Each leaves a different style of hole, so one careful morning inspection usually names your visitor. Read the guide → Yard Holes Holes in Lawn With Dead Grass Around Them: What It Means When holes and dead grass show up together, the dead grass is usually the underlying story: grubs kill turf roots and then skunks, raccoons, and birds dig holes going after them, while vole runways, yellowjacket ground nests, and dog urine spots each pair dying grass with their own style of hole. Figure out whether the grass died first or the digging came first, and the diagnosis usually follows. Read the guide → Yard Holes Holes in Mulch Beds: Who's Digging Through Your Mulch? Disturbed mulch usually comes down to a simple distinction: mulch flipped and scattered on top means squirrels or birds foraging through it, while an actual hole punched down into the soil beneath means a chipmunk, rat, or cat. Squirrels and chipmunks are the everyday culprits; the pattern of the mess tells you whether you're looking at snacking, caching, burrowing, or a litter box. Read the guide → Plant Damage Holes in My Tomatoes: Which Pest Is Ruining the Fruit? Holes in tomatoes are most often the work of tomato fruitworms (one clean round entry hole), hornworms (large shallow gouges), birds (peck marks in ripe fruit), slugs (rasped pits where fruit touches soil), or squirrels (single bites, fruit carried off). Sunken leathery patches on the bottom of the fruit aren't a pest at all — that's blossom-end rot. Read the guide → Yard Holes Holes in Yard After Rain: Why They Appear Overnight Holes that appear after a good rain are usually not new digging at all — rain exposes earthworm burrows, washes open old animal tunnels, and collapses settling soil, while wet weather brings crayfish and emerging cicadas to the surface. Most rain-revealed holes are harmless; the size and what surrounds each hole tells you which kind you have. Read the guide → Yard Holes Holes Near Your Foundation: Causes and When to Act Holes right along a foundation usually come from chipmunks, Norway rats, or voles, all of which like the shelter a house wall provides — but water pouring from downspouts and settling backfill soil carve foundation-line holes too. Sorting burrow from washout matters, because a rat burrow against the house is the one that needs fast professional attention. Read the guide → Yard Holes Holes Under the Fence: What's Digging In (or Out)? A hole under a fence is usually a travel gap scraped out by rabbits, skunks, or a neighborhood dog — or the edge of a real burrow if a groundhog has moved in along the fence line. The key distinction is pass-through versus home: a shallow trench under the boards means something is commuting through your yard, while a deep hole with a big dirt pile means something is living there. Read the guide → Animal Droppings Large Droppings in Your Yard: Raccoon, Coyote, Dog, or Fox? Large droppings in a yard usually come from raccoons, coyotes, neighborhood dogs, or foxes. Raccoon droppings are tubular with blunt ends and often accumulate in one repeated spot called a latrine; coyote droppings are rope-like and tapered with visible fur, bone, or seeds; fox droppings are smaller, twisted, and pointed at the ends. A raccoon latrine deserves special caution because of raccoon roundworm. Read the guide → Yard Holes Large Holes in Yard: Groundhog, Fox, Skunk, or Armadillo? A hole 6 inches across or bigger is a den entrance, and in most American yards the owner is a groundhog — an 8- to 12-inch hole with a big dirt mound is their signature. Foxes, armadillos, and skunks dig or borrow similar burrows, especially under sheds, decks, and porches, so smell, mound size, and location are what separate them. Never fill a large hole until you know it's empty. Read the guide → Lawn Problems Lawn Dying in Patches Despite Watering? Find the Real Cause If dead patches keep spreading no matter how much you water, water was never the problem — something is attacking the grass or the soil beneath it. The most frequent culprits are grubs eating roots, chinch bugs along hot sunny edges, compacted or debris-filled soil, fungal patch disease, and dog urine. Each one leaves a distinct fingerprint you can check in minutes. Read the guide → Plant Damage Leaves Chewed From the Edges: How to Read the Bite Marks Leaves eaten inward from the edges are usually caterpillars, grasshoppers, or — if the edges show neat crescent-shaped notches — adult weevils feeding at night. When whole leaf sections or stems are missing, the cut itself is the clue: a clean angled snip means rabbits, while ragged torn edges mean deer. Read the guide → Yard Holes Many Small Holes in the Lawn? Here's What's Behind Them When the lawn is peppered with dozens of small holes rather than one or two big ones, the cause is almost always foraging birds, earthworms surfacing after rain, or ground-nesting bees in spring. And before you blame wildlife at all, rule out the most overlooked explanation: leftover plugs from a recent core aeration. Read the guide → Mushrooms & Growths Mushroom Rings in Grass: What a Fairy Ring Is Telling You A circle or arc of mushrooms in your grass is a fairy ring: a single underground fungus colony that started at one point and has been expanding outward ever since, fruiting mushrooms at its edge after rain. Fairy rings are mostly cosmetic and notoriously hard to eliminate — for the vast majority of lawns, the right plan is managing the look and removing the mushrooms, not fighting the fungus. Read the guide → Yard Holes One-Inch Holes in Lawn: Identify the Digger by Size Holes about an inch wide in a lawn are most often the work of voles, young chipmunks, ground-nesting bees, or — in wet, low-lying yards — crayfish. An inch is a telling size: it's too big for most insects and too small for rats or full chipmunk burrows, so checking depth, soil, and location will usually name the digger. Read the guide → Mushrooms & Growths Orange Fungus in Mulch: Stinkhorns, Slime, and Siding Spots Orange growths in mulch are almost always fungi feeding on the wood itself — most often stinkhorns (the smelly orange fingers), orange peel fungus, or a slime mold. They're harmless to plants and people who leave them alone. The one mulch fungus that costs money is artillery fungus, which shoots tar-like black dots onto siding and cars. Read the guide → Lawn Problems Orange Powder on Grass? It's Almost Always Lawn Rust That orange dust coating your grass — and rubbing off on shoes, mowers, and the dog — is almost certainly lawn rust, a fungal disease that shows up on slow-growing, underfed lawns in late summer. It looks alarming but is harmless to people and pets, and it usually clears up with a light feeding and better mowing rather than any fungicide. Read the guide → Tracks, Nests & Outdoor Clues Pile of Sticks in a Tree: Squirrel Drey or Bird Nest? A large clump of sticks or leaves high in a tree is usually either a squirrel drey — a messy ball of leaves and twigs wedged into a fork — or a platform nest built by a hawk or crow. The quickest tell is the material and shape: dreys are leafy and roughly spherical, while raptor and crow nests are flatter platforms of bare sticks. Winter, when the leaves drop, is when most homeowners suddenly notice them. Read the guide → Bugs & Eggs Red and Black Bugs on Your House: What Are They? Red and black bugs clustered on your house are most likely boxelder bugs, which gather by the hundreds on warm, sunny walls in fall while looking for winter shelter. Milkweed bugs, firebugs, and tiny red velvet mites are the usual look-alikes. None of them bite, sting, or damage the structure — the real nuisance is the ones that slip inside, and the ones you squash can leave stains. Read the guide → Yard Holes Shallow Divots in Lawn: Foraging Damage Decoded Shallow divots — little scoops that stop within an inch or three of the surface — are foraging marks, not burrows: squirrels caching and retrieving nuts, skunks drilling for grubs at night, birds probing at dawn, or a dog freelancing. Because three of those four are hunting grubs, a lawn suddenly covered in divots is often really a message about what's living under the turf. Read the guide → Mushrooms & Growths Shelf Fungus on a Tree Trunk: A Sign of Decay Inside the Tree A shelf or bracket fungus growing from a living tree's trunk is a red flag: it means the fungus has been decaying wood inside the tree, often for years, before producing that visible 'conk.' The tree may still look healthy, but internal decay weakens its structure — so the right move is an assessment by an ISA-certified arborist, not knocking the fungus off. Read the guide → Tracks, Nests & Outdoor Clues Small Animal Tracks in Your Yard: How to Read Them Small animal tracks in your yard most often belong to rabbits, squirrels, raccoons, opossums, skunks, or a neighborhood cat or dog. Counting the toes, checking whether claw marks show, and looking at how the prints are grouped will identify the visitor faster than the shape of any single print. Read the guide → Animal Droppings Small Pellet Droppings in Yard: Rabbit, Deer, or Squirrel? Small pellet droppings scattered across a yard are most often left by rabbits, deer, or squirrels. Rabbits drop round, pea-size pellets in loose clusters on the lawn, deer leave larger oval pellets in concentrated piles of 20 or more, and squirrel droppings are barrel-shaped and scattered under trees. Where the pellets show up — open lawn versus garden edge — is as telling as their shape. Read the guide → Bugs & Eggs Small White Cocoons on Plants: Don't Destroy Them Yet Small white cocoons on your plants could be braconid wasp cocoons, mealybugs, spittlebug foam, or ordinary moth pupae — and the difference matters, because braconid cocoons are one of the best things you can find in a garden. If the white capsules are riding on the back of a fat green caterpillar, leave everything exactly where it is: tiny parasitic wasps are already destroying that pest for you. Read the guide → Plant Damage Something Digging in Potted Plants? Here's the Likely Culprit Something digging in your potted plants is most often a squirrel burying or retrieving nuts — the number one cause by far — followed by chipmunks, birds taking dust baths, raccoons hunting grubs at night, or a cat using the pot as a litter box. Daytime digging with small neat pits points to squirrels; pots trashed overnight point to raccoons. Read the guide → Lawn Problems Spongy Lawn That Lifts Up? Grubs, Thatch, or Moles Below A lawn that feels spongy underfoot or lifts up like carpet usually means one of three things: white grubs have eaten the roots, a thick thatch layer has built up under the grass, or moles are tunneling just beneath the surface. A simple tug on the turf and a look underneath will tell you which one you're dealing with. Read the guide → Animal Droppings Tiny Black Specks on Your Deck: Frass, Fungus, or Droppings? Tiny black specks on a deck usually turn out to be caterpillar frass raining down from trees overhead, artillery fungus spores that glue themselves to surfaces, spider droppings, or mouse droppings. The quickest test is whether the specks wipe away: frass and droppings brush off, while artillery fungus dots are stuck fast. Where the specks appear — under a tree canopy, near mulch, or along the house wall — points to the source. Read the guide → Bugs & Eggs Tiny White Bugs Under Leaves: What They Are, What to Do Tiny white bugs on the undersides of leaves are most often whiteflies, mealybugs, woolly aphids, or spider mites. The quickest test is to disturb the plant: whiteflies scatter into the air instantly, while mealybugs and woolly aphids stay put in cottony patches. All of them respond to gentle controls — a hard spray of water and insecticidal soap — so there's no need to reach for harsh chemicals. Read the guide → Animal Droppings Tubular Droppings in the Garden: Raccoon, Opossum, or Skunk? Tubular droppings in a garden bed most often come from raccoons, opossums, or skunks raiding for produce, grubs, and insects — though garter snakes and even toads leave surprisingly substantial droppings too. Blunt ends and berry seeds point to raccoon, tapered curves to opossum, and a crumbly texture full of shiny insect parts to skunk. Because raccoon droppings can carry roundworm eggs, droppings in a food garden also raise a produce-safety question worth taking seriously. Read the guide → Yard Holes Tunnels in Grass: Mole or Vole? How to Tell in Seconds Tunnels in a lawn come in two distinct styles: raised, spongy ridges you can feel underfoot are mole feeding tunnels just below the surface, while flat, worn trails clipped into the grass itself are vole runways. Moles hunt worms and grubs under your turf; voles eat the grass and bark on top of it — so telling them apart decides everything about what to do next. Read the guide → Home Exterior Clues Wasp Nest Under the Eaves: Which Wasp, and How Careful to Be A nest under your eaves is most likely paper wasps if you can see open honeycomb cells on an umbrella-shaped comb, bald-faced hornets if it's a fully enclosed gray papery ball, or mud daubers if it's made of dried mud tubes. Paper wasps and hornets will defend their nest, while mud daubers almost never sting. Identify the builder from a distance first — the right response ranges from leaving it alone to calling a licensed pest control professional. Read the guide → Bugs & Eggs Webs on Tree Branches: Tent Caterpillars or Webworms? Silky webs in your trees are most likely eastern tent caterpillars if it's spring and the web sits in a branch fork, or fall webworms if it's late summer and the web wraps the tips of branches. Both look alarming but rarely do lasting harm to a healthy tree — and whatever you do, never try to burn a nest out of a tree. Read the guide → Animal Droppings White Droppings on Your Fence: Which Bird (or Lizard) Was It? White droppings on a fence are almost always from birds — the white part is uric acid, which is how birds excrete waste instead of urine. The size and pattern tell you whether it's songbirds using the fence as a perch, larger birds like doves or hawks, or, in the southern U.S., geckos and anoles, whose small dark droppings carry a distinctive white tip. Light deposits are harmless; large accumulations deserve careful cleanup. Read the guide → Bugs & Eggs White Fuzzy Bugs Flying Around? Meet the 'Fairy Flies' Tiny white fuzzy bugs drifting through the air are usually woolly aphids — sometimes nicknamed 'fairy flies' or 'fluff bugs' — riding the breeze between host trees. Whiteflies that billow up when you brush a plant, hackberry woolly aphids, and waxy planthopper nymphs are the other common sources. Nearly all of them are harmless to you and only a minor stress on healthy plants. Read the guide → Home Exterior Clues Woodpecker Holes in Siding: Why They Drill and How to Stop It Holes pecked in your siding usually mean a woodpecker is foraging for insects, drumming to claim territory, or excavating a nest cavity — and rows of small holes often signal that insects like carpenter bee larvae are already living in the wood. A single clean half-inch round hole with sawdust below it, on the other hand, is typically the work of carpenter bees themselves. Because woodpeckers are federally protected, the fix is deterrence and repair, never harm. Read the guide → Plant Damage Yellow Leaves With Brown Spots: Disease, Mites, or Aging? Yellow leaves with brown spots are most often a fungal leaf spot disease, early blight (on tomatoes, with its bullseye-ringed spots), bacterial spot, or spider mite feeding that starts as fine pale stippling. A few yellowing lower leaves on an otherwise healthy plant, though, are usually just natural aging. Where the spots sit, their shape, and whether they have rings or halos point to the cause. Read the guide → Mushrooms & Growths Yellow Mushrooms in Potted Plants: Harmless or a Problem? Bright yellow mushrooms popping up in a potted plant are almost certainly Leucocoprinus birnbaumii, the flowerpot parasol — a tropical fungus that rides into your home in potting soil and fruits when conditions turn warm and moist. It won't hurt your plant at all; it lives on decaying organic matter in the mix, not on roots. The only real concern is that the mushrooms are toxic if eaten, so households with small children or pets that nibble should remove them. Read the guide → Lawn Problems Yellow Spots in Lawn: Urine, Fertilizer, or Something Fungal? Yellow spots in a lawn most often come from dog urine, fertilizer burn, lawn rust, iron deficiency, or overwatering. Scattered spots with green rings point to a dog; stripes or spots that match your spreader pattern point to fertilizer; orange dust on your shoes points to rust fungus. Read the guide →