The best insect spray for tomato plants is a combination of insecticidal soap and horticultural oil. If you have a problem with aphids, whiteflies or other common garden pests, this is the spray for you.

Insecticidal soap and horticultural oil are both naturally derived substances that are safe for use on tomatoes and other plants. You can buy them in a ready-to-use spray form from most garden centers or hardware stores.

They work by coating the leaves of your plants with a thin layer of oil that suffocates insects. The soap acts as an emulsifier, which helps the oil stay on your plant’s leaves longer than it would otherwise.

Tomato plants are beautiful, productive, and delicious, but they’re also vulnerable to bugs. If you have a garden full of tomato plants, you may be wondering what the best insect spray for tomato plants is. Although there are many types of insects that can threaten your tomatoes, there are some simple steps you can take to protect them from these common pests:


Aphids are soft-bodied insects that suck plant sap. They are usually green, yellow, black, or a combination of these colors. Aphids feed on the leaves, stems, and flowers of plants. They are usually found on the undersides of leaves. Aphids may also transmit viruses and bacteria to your tomato plants. If you notice aphids on your tomatoes at any time during their growth cycle, it is important to treat them right away before they reproduce in large numbers and cause serious damage to your tomato crop.

Fungus Gnats

Fungus gnats are small, black flies (1/16 inch long) that live in the soil and feed on plant roots. These pests can cause damage to your tomato plants by feeding on the root system and leave behind fungal spores that will cause root rot. Fungus gnats are attracted to the soil in pots or planters and can be difficult to get rid of if you don’t know what steps to take

There are several ways you can control fungus gnat populations:

  • Use a product containing pyrethrin insecticides such as Cutter Advanced Carpenter Ant & Fly Control. This is an aerosol spray containing Pyrethrin which kills flying insects on contact while repelling mosquitoes, ticks and spiders too. You should use this after watering your plants; however make sure not to over water as it could kill off any beneficial bugs that may be living there too.
  • Soil drenches using products such as Diazinon 14 G Super Concentrate Insecticide Dust or Merit 25 WSP Insecticide Powder allow direct contact with insects below ground level where they reside without having any harmful effects on other life forms above ground level like pets or humans

Blister Beetles

Blister beetles are a common pest of tomatoes, and can be identified by their shiny black shell and orange or yellow markings. They are about 1/4 to 3/8 inch long, and the larvae feed on roots. Blister beetles lay their eggs in the soil during spring or fall. When these eggs hatch later in the season, they feed on plant roots until they become adults.

The damage caused by blister beetles can be difficult to see at first because it often happens underground where you won’t see it right away. The first sign of this pest is wilted leaves on your tomato plants that have brown spots on them; once you notice these symptoms it’s best to act quickly.

Tomato Hornworms

You may have noticed that your tomato plants are getting eaten by caterpillars. If you’re seeing white or green caterpillars with a stripe down their back, you’ve found the culprit: tomato hornworms. These caterpillars will munch on your tomato plant’s leaves, causing harm to both fruit and foliage.

Tomato hornworms are the larvae form of tobacco hornworms and can be identified by their long bodies, which grow up to 5 inches in length. The worm has a yellow body with green stripes running along its sides, as well as large red eyes that look like they belong on a cartoon character (hence “hornworm”).

The best way to keep these pests from ruining your harvest is by using Bt (Bacillus thuringiensis) insecticides that target specific pests such as tomato hornworms without harming beneficial insects like bees or butterflies; however, if you find yourself with an infestation in your garden it’s important for you not only identify but also treat these invaders before they do any more damage.


Thrips are tiny insects that feed on the leaves and stems of tomato plants. These pests are difficult to see with the naked eye, but they can be seen under a microscope. Thrips are more common in hot, dry weather when tomato plants are most vulnerable to damage.

Thrips do not damage tomatoes directly; however, they can spread viruses that cause blossom drop and leaf curl diseases if left untreated. Planting resistant varieties will help you reduce your chances of having thrips problems on your tomato plants

Colorado Potato Beetles

Colorado potato beetles are green and have yellow or brown stripes on their bodies. They also have black spots on their backs, which is how they got the name Colorado.

They’re particularly fond of eating holes in leaves, but they can also eat the roots at night when it’s cooler and then return to eat new leaves during the day.

Colorado potato beetles are a threat to potatoes, eggplants, peppers and tomatoes. You’ll usually notice them first because of their habit of sucking juices from your plants’ stems, they’ll target young plants first, so if you see this happening in spring it could mean that you’ve got some Colorado potato beetles on your hands.

Spraying your tomato plants with a solution of dish soap and water can help keep these bugs at bay.

Spraying your tomato plants with a solution of dish soap and water can help keep these bugs at bay. To make this spray, mix together 2 teaspoons of liquid hand soap and 1/2 teaspoon of vegetable oil in a spray bottle filled with water. Spray the mixture on the top and underside of your tomato leaves every week during the growing season (when bugs are most active).

Spray early in the morning or late in the evening when temperatures are cooler.

Even if you don’t have a green thumb, it’s easy to take care of your plants. With some care, the right tools, and a little bit of know-how, anyone can grow tomatoes in their backyard or garden.

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