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If uncontrolled, early blight can cause significant yield reductions. [4] Primary methods of controlling this disease include preventing long periods of wetness on leaf surfaces [5] and applying fungicides. [6] Early blight can also be caused by Alternaria tomatophila, which is more virulent on stems and leaves of tomato plants than Alternaria ...
This group of pyrazole carboxamide fungicides are very effective against major crop pests such as Alternaria species, including early blight of tomato and potato. [ 2 ] : 416–8 [ 12 ] However, none display commercial levels of activity against oomycetes , fungal-related organisms which include important diseases like Phytophthora infestans ...
Fungicides for the control of potato blight are normally used only in a preventative manner, optionally in conjunction with disease forecasting. In susceptible varieties, sometimes fungicide applications may be needed weekly. An early spray is most effective. The choice of fungicide can depend on the nature of local strains of P. infestans.
Leaf blight occurs in areas with hot and humid weather. The spores land on onion leaves, penetrate the skin, and rapidly kill the leaf. This causes a severe reduction in bulb size, as high as 50%, and can happen in less than a week. [120] Applications of foliar fungicides can be used to control leaf blight.
Darkening lesions on tomato leaves Advanced necrosis on tomato leaf. Stemphylium solani is of greatest concern in tomatoes, potatoes, peppers, garlic, onions, and cotton, though a wide range of over 20 species have proven susceptible. In tomatoes and potatoes, the resulting disease is known as grey leaf spot. In alliums it is known as leaf ...
Alternaria alternata – Causes early blight of potato, leaf spot disease in Withania somnifera [9] Alternaria allii - causes onion leaf blight; Alternaria arborescens – causes stem canker of tomato; Alternaria arbusti – causes leaf lesions on Asian pear; Alternaria blumeae – causes lesions on Blumea aurita
A. a. f. sp. lycopersici (AAL) infects only certain cultivars of tomato plants and is often referred to as Alternaria stem canker of tomato. [3] AAL ' s main symptom is cankers in the stem. It resides in seeds and seedlings, and is often spread by spores as they become airborne and land on plants. It can also spread throughout other plants. [4]
Bacterial seedling blight of rice (Oryza sativa), caused by pathogen Burkholderia plantarii [4] Early blight of potato and tomato, caused by species of the ubiquitous fungal genus Alternaria; Leaf blight of the grasses e.g. Ascochyta species [5] and Alternaria triticina that causes blight in wheat [6]
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