Clean out the dead plant material and use a variety of tomato companion plants in your garden that repel aphids, such as catnip, garlic, or chives. If you deal with aphids in your garden, consider using organic sprays or natural predators. Most tomato pests are managed with healthy soil, proper planting techniques, and crop rotation. Mites and aphids are two common predators that place added stress and damage on the plant, causing yellowing leaves as one result. Testing soil can pinpoint the fertilizer type and nutrients your tomato garden needs most. As always, make sure the plants are well watered before and after fertilizing.įor the best results in your garden, consider having your soil tested. If you have tomatoes in containers, you may need to fertilize them every two to four weeks. How often will you need to fertilize? Young tomatoes will need fertilization every two weeks before you can start cutting back. Pro tip: Epsom salts can be used to treat yellowing leaves caused by magnesium deficiency. These small changes can help prevent many causes of yellowing leaves. Also, look at a fertilizer's micronutrients like calcium, magnesium, and copper. Pay attention to the fertilizer you use and consider switching to organic fertilizer for better results and improved soil health. A lack of these nutrients leads to yellowing leaves, referred to as chlorosis. Two of the primary ingredients in fertilizer include nitrogen and potassium. Tomatoes need several nutrients from the soil, including: walkerone / ShutterstockĪnother cause of yellow leaves on tomato plants is nutritional deficiencies. This tomato is suffering from a lack of nitrogen. That’s why prevention tactics are vital to avoiding diseases that can harm your tomato leaves. Poorly drained soils put your plants at risk of various diseases, and by the time you notice, there isn’t much you can do. Avoid watering after a rainstorm and consider increasing watering with scorching temperatures. If you don't want to purchase a drip irrigation system, pay more attention to the weather in your region. Using drip irrigation also reduces the likelihood of tomato diseases. Drip irrigation systems are 90% efficient, compared to only 65% to 75% efficiency with sprinkler systems. Watering from above increases the chances of sun damage and disease.Ĭonsider installing a drip irrigation system in an outdoor garden to deliver water more efficiently to the plant roots.
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