![]() ![]() If weather conditions are cool and wet, entire plants can collapse and die from late blight in seven to 10 days. ![]() Stems can also exhibit dark-brown to black areas. What does late blight look like? On leaves of tomato or potato, late blight begins as pale-green or olive-green areas that quickly enlarge to become brown-black, water-soaked, and oily-looking. More recently, the disease caused severe losses for fresh market tomato producers and home gardeners in Wisconsin. Historically, late blight was responsible for the Irish potato famine, which led to the death of at least one million Irish, and the emigration of another one million Irish to Great Britain, the United States, Australia, Canada and other countries. This disease also affects, although typically to a lesser extent, eggplants and peppers, as well as related weeds such as nightshade. What is late blight? Late blight is a destructive disease of tomatoes and potatoes that can kill mature plants, and make tomato fruits and potato tubers inedible. JWash Acad Sci 23: 435–446.Late blight can decimate tomatoes and potatoes in seven to 10 days if weather conditions are cool and wet.Īmanda Gevens, Anna Seidl, Brian Hudelson, UW-Madison Plant Pathology The dark ages in plant pathology in America: 1830–1870. A second world migration (and population displacement) of the potato late blight fungus? Plant Pathol 40: 422–430. Production and germination of oospores of Phytophthora infestans. A Source Book of the Genus Phytophthora infestans. Assessment of field responses of potato cultivars and breeder seedlings to potato late blight epidemics. Phytophthora infestans: The Mexican connection. The blight, the blighter, and the blighted. An alternative possible origin of the A2 Mating type of Phytophthora infestans outside Mexico. (Ed.) 1981 Compendium of Potato Diseases. Strains of Phytophthora infestans from Switzerland with A2 mating type behavior. Use of detached leaf assay for evaluating late reactions of potato and tomato. An efficient technique for prolonged storage of Phytophthora infestans. Direct detetion of gene flow and probable sexual reproduction of Phytophtora infestans in Northern North America. Migration from northern Mexico as the probable cause of recent genetic changes in populations of Phytophthora infestans in the United States and Canada. Panglobal distribution of a single clonal lineage of the Irish potato famine fungus. Genetic analyses of interspecific hybrids between Phytophthora infestans and Phytophthora mirabilis Exp Mycol 18: 20–32. A second world-wide migration (and population displacement) of the potato late blight fungus? Plant Pathol 40: 422–430. Population genetic structure of Phytophthora infestans in the Netherlands. Historical and recent migrations of Phytophthora infestans. Occurrence of A2 mating type of Phytophthora infestans in potato fields in the United States and Canada. Early reports of destructive attacks of late blight on tomatoes in England. infestans on detached and intact leaves of potato cultivars Green Mountain and Kennebec and the tomato cultivar Bonnie Best.Īllard, H.A. There were no significant differences in reactions to isolates of P. Lesion growth was determined 4, 5, and 6 days following inoculation. Leaves on intact tomato and potato plants were inoculated in a similar manner and placed in a mist chamber. The supporting hardware cloth was placed 2.5 cm above distilled water (2.5 cm deep) in 31 cm × 17 cm × 8 cm clear plastic boxes with tight fitting lids. A single disc was placed on the center of the tomato leaf. A 12.5 mm sensi-disc containing 50μl of 2 × 10 4 zoospores was placed in the centers of the terminal leaflet and the second leaflet pair of the potato leaf. The leaves in the aqua tubes were placed with abaxial sides down on galvanized metal hardware cloth (12.5 × 12.5 mm mesh). Their petioles were inserted into 14 mm × 100 mm floral aqua tubes containing 9 ml of sterilized distilled water. Primary leaves from the third to the sixth node of potato plants, and the fourth to sixth node of tomato plants were excised at the stem. ![]() We developed a detached leaf method for evaluating potato ( Solanum tuberosum L.) and tomato ( Lycopersicon esculentum Mill.) germplasm for reactions to Phytophthora infestans, the causal organism of late blight. ![]()
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