Potato blight

Escape Shorter crop growth period and/or early ripening to be able to avoid the critical infestation period, or to have enough yield before the infestation becomes too severe (potato/late blight onion/downy mildew carrot/carrot fly) One or more monofactorial and multifactorial, durable resistance traits against pest and disease affecting yield and/or quality (scab/apple, late blight/potato, lettuce/downy mildew, yellow and brown leaf rust/wheat) weed competition by an allelochemical ability... 

Cause Late blight. Potatoes -have dark, purplish blotches on skin dark, corky areas ) flesh. 

In the early 1970 s, it was proposed that spina bifida and anencephaly in humans resulted from a teratogen present in blighted potatoes (Renwick, 1972). This suggestion raised suspicion that potato alkaloids such as solanidine, which contains a C-27 cholestane skeleton with a tertiary amino group shared by rings E... 

Tin compoimds used to be available for killing spores which fell on the soil before they reached the tubers, but are now no longer approved. To reduce the risk of spores spreading from the leaves to the tubers, the haulms should be destroyed when about 70% have been killed by blight this is especially important if heavy rain is expected (Table 6.2). It is also important to think about preventative measures to stop the spread of blight. Potato dumps and volunteers in neighbouring fields are important sources. Reject and waste potatoes should be deeply buried and volunteers should be killed off in other crops before they become a source of iirfection. 

CioHgC NOiS. A protective non-systemic fungicide used principally for the control of potato blight. M.p. 160-161 C. It is relatively non-toxic to most animal life although it is harmful to hsh. 

The most serious disease problems encountered in organic crops are blight in potatoes and seedbome diseases in cereals. Plant breeders are improving blight resistance in potatoes. As organically grown cereal seed cannot be treated, it is very important that it is tested for seed-borne diseases such as fusarium and smut. Foliar diseases in organic... 

Potatoes Blight Phytophthora infestans Bordeaux mixture, copper oxychloride, copper sulphate + sulphur... 

Andrivon, D., Lucas, J.M. and Ellisseche, D. (2003). Development of natural blight epidemics in pure and mixed plots of potato cultivars with different levels of partial resistance , Plant Pathology, 52, 586-596. 

Daayf, F., Adam, L. and Fernando, W.G.D. (2003). Comparative screening of bacteria for biological control of potato late blight (strain US-8), using in-vitro, detached-leaves, and whole-plant testing systems , Canadian Journal of Plant Pathology, 25 (3), 276-284. 

Kuepper, G. and Sullivan, P. (2004). Organic alternatives for late blight control in potatoes , in Pest Management Technical Note, http //attra.ncat.org/attra-pub/lateblight.html... 

Lapwood, D.H. (1977). Factors affecting the field infection of potato tubers of potato tubers of different cultivars by blight (Phytophthora infestans), Annals of Applied Biology, 85, 23 -2. 

Leifert, C. and Wilcockson, S.J. (2005). Blight-MOP Development of a systems approach for the management of late blight (caused by Phytophthora infestans) in EU organic potato production. Final Report, Newcastle University, UK. 

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