Protect your tomatoes from pests using physical barriers like fine mesh or organza bags placed over individual fruits, and deter insects with organic sprays like neem oil. Maintain healthy plants by mulching, proper spacing, and pruning to naturally resist pest attacks.
Popular DIY Remedies: Garlic Spray: Blend garlic cloves with water and a splash of liquid soap. Spray it on your plants to repel aphids and caterpillars. Neem Oil Spray: Extracted from neem tree seeds, this spray is effective against aphids, spider mites, and whiteflies.
Planting herbs, flowers, and alliums around your tomatoes is a highly effective, natural way to deter pests.
Plant your tomatoes in the full sun (8+ hours) at least 3-4 feet apart, leaving space between plants. This will discourage slugs, which cannot withstand the sun and avoid open ground. Apply BT spray, which is also approved for organic gardening, if tomato hornworms or other caterpillars attack your plants and fruits.
Using Dawn soap on tomato plants can be risky. While DIY soapy water acts as a contact pesticide, Dawn is a heavy-duty detergent. It can strip the protective waxy layer from tomato leaves, leading to leaf burn, wilting, and increased water loss.
The best homemade insecticide depends on your pest, but a highly effective, all-purpose spray is Soapy Water. It smothers soft-bodied insects like aphids and mites. Mix 1 teaspoon of mild liquid dish soap (like castile soap) with 1 cup of water or vegetable oil.
Gardeners use baking soda around tomato plants primarily to prevent fungal diseases, deter pests, and potentially sweeten the fruit by adjusting soil acidity.
Coffee grounds are added to tomato plants because they provide a slow-release source of nitrogen, improve soil structure, and can help deter pests like slugs and snails. They are best used in moderation or mixed into compost rather than piled thickly, as too many can compact the soil.
Never plant fennel, brassicas (like cabbage, broccoli, and kale), potatoes, or corn near tomatoes. These plants can stunt tomato growth, compete aggressively for nutrients, or spread devastating diseases and pests.
Planting specific flowers with your tomatoes repels pests through natural scents, root secretions, and by attracting beneficial predator insects.
Regardless of what you might read or see in nursery promotions, planting tomatoes in October or November is not a fruitful experience, literally. The night temperatures are too low for the flowers to set fruit. Tomatoes planted in August or early September will grow quickly in the warm soil, warm nights and long days.
No, Dawn is not an insecticidal soap. Dawn is a synthetic detergent designed as a heavy-duty degreaser. True insecticidal soaps are made of potassium salts of fatty acids and are specially formulated to target pests without damaging plants.
Tiny black bugs on tomato plants are usually flea beetles (which jump like fleas and leave small round holes in leaves) or aphids (pear-shaped, soft-bodied insects that cluster on stems). To treat them, wash plants with a strong stream of water or spray with organic Neem Oil.
The best natural pesticide depends on your specific pest: Neem oil is highly effective against soft-bodied insects (like aphids and mites), while Bacillus thuringiensis (Bt) targets caterpillars. For heavy infestations, Spinosad is a broad-spectrum, naturally derived choice.
Hydrogen peroxide can be highly beneficial for tomato plants if used correctly. It is a cheap, effective, and readily available remedy used to control fungal diseases, manage pests, and aerate waterlogged soil. However, because it is a strong oxidizer, using too much can damage your plants.
To grow bigger tomatoes, maximize the fruit's size by pruning excess branches, restricting the plant to just one or two main stems, and plucking off early blossoms. This diverts the plant's energy into sizing up the remaining tomatoes rather than spreading resources across too many fruits.
The U.S. Department of Agriculture recommends using baking soda to prevent fungal diseases in tomato plants. Mix 1 tablespoon of baking soda, 1 teaspoon of vegetable oil, a small amount of dish soap, and a gallon of water to make a solution to spray on the plants throughout the season.
To keep bugs off your plants safely and effectively, use a diluted mixture of dish soap and a carrier oil (like olive oil or neem oil). For existing pests, use targeted commercial treatments like Bonide Neem Oil.
As a bug deterrent, WD-40 is surprisingly effective when used the right way. Before diving into the rest of the article, WD-40 is not a bug killer. The chemicals in WD-40 are designed for lubrication, not shorting out the nervous system of an insect.
Using Dish Soap as Insecticide
Soapy water for aphids is one of the most common uses, but it also works on other soft-bodied insects like whiteflies, thrips, and mites. However, it doesn't work on larger pests like caterpillars and beetles. But this also means it is safe for most pollinators and large insects!
The best homemade insect spray for tomato plants is a DIY Neem Oil or Soap Spray, which effectively targets soft-bodied pests like aphids, mites, and whiteflies. Because it physically smothers and dehydrates insects, it won't harm the plant, though you should avoid spraying directly on beneficial pollinators.
To get rid of bugs on your tomato plants quickly, manually remove large insects by hand and wash tiny pests off with a strong blast from your garden hose. Follow up by spraying the foliage with organic insecticidal soap, Neem oil, or a homemade DIY garlic and soap spray.
Encourage the natural enemies of aphids in your garden, such as ladybirds, ground beetles, hoverflies, parasitoid wasps and earwigs. In spring, aphid populations increase before the natural enemies are active in sufficient numbers – so if you wait a while, they'll often give the control.