9/11/2023 0 Comments Late blight disease cycleEarly blight symptoms are more circular, larger and darker than late blight marking and have a definite concentric ( zonate) margins. Late blight is sometimes confused with early blight ( Alternaria solani). Late blight symptoms can be mistaken for several other diseases. Infected potato tubers exhibit wet and dry rots. In moist weather, a white downy fungal growth may appear on the affected fruit-rot surface. On tomato fruit, grey green watery spots can develop on the upper half of the fruit, which later spread and turn greasy brown and bumpy. Note scorched appearance of leaves, stems and fruits. Stems can also develop elongated, greyish watery brown lesions. In dry weather, affected foliar parts may appear dry and shrivelled. In moist conditions, a downy white greyish mould usually develops near the margin of leaf spots on the underside of leaves. The spots may enlarge rapidly until entire leaflets are killed. Leaf spot margins often are pale green or water-soaked. On leaves, pale green to brown spots, sometimes with a purplish tinge, appear on the upper surface of leaves. In potatoes, tubers can also be infected. ![]() Late blight symptoms can develop on leaves, stems, branches, and in case of tomatoes on both green and ripe fruits. When conditions favour development of late blight and there are no steps taken to suppress the disease, it can completely destroy the above-ground parts of plants (stems, leaves, tomato fruits) and can also affect potato tubers. It is known as the most devastating disease of potatoes. Late blight of potatoes or tomatoes can be devastating with dramatic and disastrous economic consequences. Late blight is a fungal disease that can affect many vegetables of the Solanum species, mainly potatoes and tomatoes, but also eggplants.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |