Walk into any garden center or ag supply store and you'll hear all three words used almost interchangeably, often by the same person in the same sentence. That's understandable — they're related, they're often shelved near each other, and the packaging doesn't always make the distinction obvious. But mixing them up when you're actually buying something can mean walking home with a product that does nothing for the problem you actually have.
Pesticide: The Umbrella Term
Pesticide is the broad category that everything else falls under. Technically, any product designed to kill, repel, or control a pest — whether that pest is a weed, an insect, a fungus, or a rodent — is a pesticide. It's the genus, not the species.
Pro tip: If a product label just says "pesticide" with no further detail, that's a red flag, not a feature. A well-labeled product will always tell you exactly which category it falls into and which pests it targets.
Herbicide: Targets Plants
A herbicide is a pesticide specifically formulated to kill or control unwanted plants — weeds, brush, invasive vines, and grasses you don't want in a particular space. Herbicides work through mechanisms that disrupt plant-specific biological processes, like photosynthesis or amino acid production, which is part of why a properly labeled herbicide generally won't harm insects or animals at recommended use rates.
Insecticide: Targets Insects
An insecticide is a pesticide formulated to kill or control insects — aphids, mites, thrips, beetles, and similar pests that damage crops or plants. Insecticides work through entirely different mechanisms than herbicides, often targeting an insect's nervous system or exoskeleton, and they generally have no effect on plants at all.
Quick Comparison
| Term | Targets | Example Use Case |
|---|---|---|
| Pesticide | Any pest (umbrella term) | General category, not a specific product type |
| Herbicide | Unwanted plants/weeds | Clearing a field, killing lawn weeds |
| Insecticide | Insects and mites | Protecting crops from aphids or thrips |
Why This Distinction Actually Matters When You're Buying
Using a herbicide on an insect problem does nothing — and vice versa. Worse, using the wrong product can waste an entire treatment window while the actual problem keeps spreading. If you've got aphids on your roses, a herbicide won't touch them; you need a product like our Abamectin 1.8% EC, formulated specifically for mites and insects. If you've got bindweed choking out a fence line, no insecticide will help — that calls for a systemic herbicide like our Ammonium Glyphosate 15%.
Watch out: Some generic "bug and weed" combo products marketed for home use are diluted so heavily that they underperform at both jobs. A dedicated herbicide and a dedicated insecticide, used for their specific purpose, will almost always outperform a do-everything combo product.
Frequently Asked Questions
Is Roundup a herbicide or a pesticide?
Both, in the sense that herbicide is a subcategory of pesticide — glyphosate-based products like this are specifically herbicides, formulated to kill plants, not insects.
Can I use insecticide and herbicide on the same plant at the same time?
Generally check both product labels for compatibility before combining, since some active ingredients can interact or one product's carrier oils can affect how the other absorbs.
Does a herbicide harm insects or pollinators?
Properly labeled herbicides used at recommended rates are formulated to target plant-specific processes and generally have minimal direct effect on insects, though always check the specific product's label and any pollinator-related precautions.
Browse our full range of herbicides built specifically for weed and vegetation control.