Have you ever sprayed your plants, picked bugs off the leaves, or tried everything you could think of—only to walk outside a day or two later and find even more damage?
Watch the Video
Prefer to see exactly what the damage looks like and how I identify and treat each type of garden pest? Watch the video below, then keep reading for a detailed guide, quick reference chart, and recommended products.
One of the biggest mistakes gardeners make is treating every pest the same way. The truth is, different pests feed differently, damage plants differently, and require different treatments. Once you know what signs to look for, choosing the right solution becomes much easier—and you'll stop wasting time using products that aren't designed for the pest you're fighting.
In this guide, I'll show you how to identify the three most common types of garden pests, recognize the damage they leave behind, and choose the right treatment before you lose more plants.
Curled Leaves and Sticky Residue? Check for Sap-Sucking Pests
If your leaves are curling, becoming distorted, or covered with a sticky residue called honeydew, you're likely dealing with sap-sucking insects.
Common sap-sucking pests include:
· Aphids
· Whiteflies
· Spider mites
· Leafhoppers
· Scale insects
These pests pierce plant tissue and feed on plant sap, slowly draining the plant's energy. As they feed, they reproduce rapidly and often hide underneath leaves where they're difficult to spot until populations explode.
Another clue is ants. If you've noticed ants crawling all over your plants, they're often feeding on the honeydew left behind by aphids and whiteflies. Left untreated, that sticky residue can also lead to black sooty mold growing on your leaves.
How to Treat Sap-Sucking Pests
For light infestations:
· Spray plants with a strong stream of water every couple of days.
· Gently rub heavily infested leaves if needed.
· Always check the undersides of leaves where these pests hide and lay eggs.
If the infestation is spreading from plant to plant, it's time to step things up.
I use Monterey Take Down Garden Spray, a contact spray that works quickly on aphids, whiteflies, spider mites, and other sap-sucking insects. Since it's a contact spray, you need to thoroughly coat the insects—especially underneath the leaves where they live.
I also recommend spraying in the evening to help protect beneficial insects and reduce the chance of leaf burn.
Holes in Your Leaves? You're Dealing with Leaf Chewers
If your plants have ragged holes, missing chunks, or leaves that seem to disappear overnight, you're likely dealing with leaf chewers.
Common leaf chewers include:
· Caterpillars
· Cabbage worms
· Beetles
· Grasshoppers
Unlike aphids, these pests don't suck sap—they actually eat the leaves.
Every leaf your plant loses is energy it can no longer use to grow, flower, and produce vegetables. Heavy infestations can quickly reduce plant vigor and harvests.
How to Treat Leaf Chewers
For smaller infestations:
· Hand-pick caterpillars and beetles whenever possible.
· Check underneath leaves and along stems where many pests hide.
When the damage becomes widespread, I switch to Monterey Garden Insect Spray with Spinosad.
Unlike contact sprays, Spinosad works when chewing insects feed on treated leaves. They stop feeding quickly, preventing further damage and helping protect the rest of your garden.
This is where many gardeners make a costly mistake—using the same treatment they used for aphids. Different pests require different solutions.
Overnight Damage? Look for Ground Pests
Have you ever walked outside and wondered what happened overnight?
Your plants looked perfectly fine yesterday, but now seedlings have disappeared, leaves are shredded, or you notice slime trails across the soil.
That's usually a sign you're dealing with ground pests.
Common nighttime pests include:
· Slugs
· Snails
· Earwigs
· Pill bugs
These pests hide during the day under mulch, boards, pots, and other cool, damp places before emerging at night to feed.
How to Prevent Ground Pests
The easiest way to control these pests is to make your garden less inviting.
Simple prevention steps include:
· Remove boards, pots, and unnecessary debris.
· Pull mulch slightly away from the base of plants.
· Water early in the morning so the soil surface dries before evening.
These simple changes can dramatically reduce pest activity.
How to Treat Ground Pests
Whenever I transplant seedlings or know pest pressure is high, I apply Sluggo Plus around newly planted vegetables.
Sluggo Plus helps interrupt the feeding cycle before slugs, snails, earwigs, and pill bugs can continue damaging your plants.
The Biggest Mistake Gardeners Make
The biggest mistake isn't always choosing the wrong product.
It's treating every pest the same way.
-Aphids don't feed like caterpillars.
-Caterpillars don't behave like slugs.
-Ground pests require completely different control methods than insects feeding on leaves.
Once you identify how the pest feeds, choosing the correct treatment becomes much easier—and much more effective.
Instead of guessing, you'll solve the problem faster while protecting your plants from unnecessary damage.
Frequently Asked Questions
Why isn't my pest control working?
Many gardeners correctly recognize they have pests but incorrectly identify which pest is causing the damage. Different pests require different treatments.
How do I know if I have aphids or caterpillars?
Aphids typically cause curled leaves, distorted growth, and sticky honeydew.
Caterpillars leave holes, missing sections of leaves, and ragged chewing damage.
What's eating my plants overnight?
Slugs, snails, earwigs, and pill bugs are among the most common nighttime garden pests.
What's the best organic pest control?
The best product depends on the pest you're treating. Matching the treatment to the way the pest feeds is the key to stopping damage quickly.
Quick Garden Pest Reference Guide
| If you see... | Most likely pests | Best treatment |
|---|---|---|
| Curled leaves & sticky residue | Aphids, whiteflies, spider mites, leafhoppers, scale insects | Monterey Take Down Garden Spray |
| Holes in leaves or missing chunks | Caterpillars, cabbage worms, beetles, grasshoppers | Monterey Garden Insect Spray with Spinosad |
| Overnight damage, shredded leaves & damaged seedlings | Slugs, snails, earwigs, pill bugs | Sluggo Plus |
Recommended Products
These are the same organic pest control products I use throughout the growing season to help manage common garden pests.
Monterey Take Down Garden Spray
For aphids, whiteflies, spider mites, leafhoppers, and other sap-sucking insects.
Monterey Garden Insect Spray with Spinosad
For caterpillars, cabbage worms, beetles, grasshoppers, and other leaf-chewing pests.
Monterey Sluggo Plus
For slugs, snails, earwigs, pill bugs, and other ground pests.
Save 20%
Monterey Lawn & Garden
Organic pest and disease control products we trust and use throughout the growing season.
Use code CALIKIM20 to save 20%
https://www.montereylawngarden.com
