Disease develops at moderate to warm (59 to 80 F) temperatures 82 to 86 F is its optimum temperature range.Both pathogens can infect tomatoes, potatoes, peppers, and several weeds in the Solanaceae family including black nightshade ( Solanum ptycanthum), and hairy nightshade ( Solanum physalifolium).Early blight can be caused by two closely related species: Alternaria tomatophila and Alternaria solani.Fruit spots are leathery and black, with raised concentric ridges.Fruit can be infected at any stage of maturity.Stem infections on older plants are oval to irregular, dry brown areas with dark brown concentric rings. If the infection girdles the stem, the seedling wilts and dies. The stem turns brown, sunken and dry (collar rot).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |