![]() ![]() Fungal disease of potato and tomato in the Negev desert. The critical period for the control of early blight ( Alternaria solani) of potato. Epidemiology and control of potato early blight caused by Alternaria solani. The effects of Alternaria solani and Verticillium dahliae on potatoes growing in Israel. Association of potato early blight, nitrogen fertilizer rate and potato yield. An improved grading system for measuring plant diseases. The rationale for the Horsfall-Barratt plant disease assessment scale. Fungicidal spray schedules in relation to the epidemiology of the disease. Control of potato early blight in Colorado. Lack of economic benefits by fungicides applied through center-pivot irrigation systems for control of Alternaria solani on potato. American Potato Journal 49: 1–6.Įaston, G. Screening potatoes for field resistance to early blight. Screening for field resistance to early blight ( Alternaria solani) in potatoes. Stakman Commemorative Symposium, University of Minnesota, Minneapolis, Minnesota.Ĭaligari, P. Krupa (Eds), Assessment of losses which constrain production and crop improvement in agriculture and forestry. lycopersci on potatoes and of Alternaria porri f. Host and biotic factors affecting sporulation of Stemphylium botryosum f. Chlorothalonil has been withdrawn, mancozeb is likely to be withdrawn (in 2023 or 2024).Bashi, E. However, against Alternaria species, fungicides available include: QoI (strobilurin fungicides) and alternatively, hydrogen peroxide, potassium bicarbonate or copper-containing products such as Bordeaux Mixture for organic crops. Most potato ‘blight’ information actually relates to ‘late blight’ caused by Phytophthora infestans. There are reports of differences in susceptibility of varieties to early blight but resistance information is currently not included in the AHDB potatoes variety database.įungicides: According to the label, these usually need to be reapplied every 7-14 days. Remove Solanum species such as nightshade and potato volunteers. Increase row separation slightly to improve ventilation. Irrigate crops early in the day so the leaves remain wet for as short a period as possible or use drip irrigation. If possible add mulch to prevent dispersal of spores. Removal of as much crop debris as possible after harvest and leave at least a 3-year separation in cropping of potatoes on the same land. It can also be encouraged by hedgerow plants or weeds such as nightshade ( Solanum family). The disease can be spread to new locations on infected seed tubers. solani (above, right) have a long tail, compared to those of Alternaria alternata (above, left) which are much shorter and rounder and also infect potato crops. Symptoms appear in 2-6 days after infection depending on temperature. In particularly warm and wet conditions (20-30☌), this can take only a few hours. The spores germinate to infect crops in wet conditions via wounds, stomata and direct penetration of leaves. These are produced in humid, damp conditions, typically close to the ground or on diseased leaves during prolonged wet or humid weather, and are dispersed by wind and rain. The fungus survives in soil and crop debris and is spread by many cycles of infection by asexually-produced spores (conidia). On potato tubers, lesions appear as dark, dry, shrunken patches on the skin, extending into the tuber. Girdling of the stem by this kind of lesion can cause death of the plant. On stems, lesions appear as dark patches of collapsed tissue giving a darker, shrunken zone. Symptoms often appear first on older leaves near the ground as dark brown spots surrounded by a zone of yellowing or chlorosis. Early blight is caused by the fungus Alternaria solani, which infects both potato and tomato crops, along with other species of the Solanum family, causing yield losses due to reduction in green leaf area (early senescence) and direct infections of fruits and tubers. ![]()
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