![]() Deivamani, Assistant Professor, Horticulture Research Station, Yercaud-636602. ![]() Close plant spacing and over-irrigation promote disease development and should be avoidedĭr.Southern blight has a wide host range, affecting over 500 plant species. and can even cause problems in temperate locations like Wisconsin during periods of warm, moist weather. This disease causes damage in the southern U.S. Crop rotations of two years or more to a non-host crop like corn or small grains will help to prevent build-up of inoculum and disease problems What is Southern blight Southern blight is a lethal fungal disease that is most common in the tropics and subtropics.Wet periods of high temperatures (85-95 ☏).Soil borne, machinery or water-moved infested soil, survives on numerous weed and crop hosts.In the case of both bacterial wilt and southern blight, unfortunately, there isn’t much that can be done for the current crop of tomatoes once you have the disease. Southern blight can affect many other types vegetable plants, including peppers, green beans, and watermelons. Slightly sunken, yellow spots develop on invaded fruit, which rapidly decay, collapse, and become covered by a white fungal mass with numerous sclerotia. As with bacterial wilt, tomato is not the only host of this disease.The use of rhizobacteria for the biological control of Southern blight disease is a potent alternative to chemical fungicides. Fungus is exceedingly destructive on ground crops and attacks the fruit where they contact the soil. Southern blight of tomato caused by Sclerotium rolfsii can cause severe plant mortality and yield losses.It has been a significant crop pest in warmer parts of the. Often the entire root system is destroyed. It was named for a Peter Henry Rolfs, who first found it in tomato fields in Florida in 1892.Mycelium often grows over the diseased tissue and surrounding soil forming a white mat of mycelial threads with the typical tan-to brown, at the crown mustard-seed-sized sclerotia.Mature plants are attacked just below the soil surface and are completely girdled.Post Harvest Diseases:: Vegetables:: Tomato
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