How to Treat Blackfly on Tomato Plants

Blackfly, also known as aphids, can be a common problem for tomato plants. They are small insects that feed on the sap of the plant, causing stunted growth, yellow leaves, and reduced fruit production. Fortunately, there are several methods to treat blackfly and keep your tomato plants healthy.

1. Use Natural Predators

One effective way to control blackfly is to introduce natural predators, such as ladybirds, lacewings, or parasitic wasps. These insects feed on the blackfly and help to control their populations. You can purchase these predators from garden centers or online stores, or you can attract them to your garden by growing plants that they like, such as dill, fennel, or alyssum.

2. Spray with Soap or Oil

Another method to treat blackfly is to spray the tomato plants with a solution of soap or oil. A simple recipe is to mix one tablespoon of dish soap or vegetable oil with one quart of water and spray the plants thoroughly. The soap or oil will coat the blackfly and suffocate them. Be sure to spray both the top and bottom of the leaves, and repeat the treatment every two to three days until the blackfly are gone.

3. Use a Garlic Spray

Garlic is a natural repellent for many insects, including blackfly. To make a garlic spray, blend two bulbs of garlic with one quart of water in a blender, then strain the mixture and add a few drops of dish soap. Pour into a spray bottle and apply to the tomato plants, being sure to cover both the leaves and stems. This should repel the blackfly and prevent them from returning.

4. Companion Planting

Companion planting is the practice of planting different crops together to benefit each other. In the case of blackfly, planting onions or marigolds near the tomato plants can help to repel the insects. Onions release a strong odor that repels many pests, while marigolds contain a chemical that repels blackfly. Be sure to plant these companion crops close to the tomato plants to maximize their effectiveness.

5. Remove Infested Plants

If your tomato plants are severely infested with blackfly, it may be best to remove them entirely. This will prevent the blackfly from spreading to other plants and will give you a fresh start with new, healthy plants. Be sure to dispose of the infested plants in the trash or compost bin, rather than leaving them in the garden to spread the blackfly to other areas.

In conclusion, blackfly on tomato plants can be a frustrating issue for gardeners, but there are several methods to treat and control them. By using natural predators, soap or oil sprays, garlic sprays, companion planting, or removing infested plants, you can keep your tomato plants healthy and free from blackfly damage.