Effects of inoculum concentration, wetness duration and plant age on development of early blight (Alternaria solani) and on shedding of leaves in tomato plants
Tóm tắt
Effects of inoculum concentration, wetness duration and plant age on the development of tomato early blight were evaluated in relation to host susceptibility under controlled environmental conditions. The main effect of early blight was premature defoliation, which was linearly related to the percentage of leaf area showing symptoms. As ln(inoculum concentration, conidia mL−1) increased from 6·2 to 11·5, the percentages of leaf area affected and of defoliation increased linearly. Four h of leaf wetness after inoculation were sufficient to initiate the disease on plants of hybrid Skala RZ but not on those of cv. Rio Rojo, for which at least 6 h leaf wetness were needed. As wetness duration increased up to 24 h, there was an increase in the percentage leaf area showing symptoms and in the percentage of defoliation, but thereafter there was no significant increase in either parameter. Tomato plants were susceptible to
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Tài liệu tham khảo
Babadoost M, 1979, Pathogens causing Alternaria diseases of Brassica seed crops in western Washington, Plant Disease Reporter, 63, 815
Basu PK, 1974, Measuring early blight, its progress and influence on fruit losses in nine tomato cultivars, Canadian Plant Disease Survey, 54, 45
Datar VV, 1982, Conidial dispersal of Alternaria solani in tomato, Indian Phytopathology, 35, 68
Gupta RBL, 1986, Effect of age of host, inoculum concentration and duration of high relative humidity on development of purple blotch of onion, Phytophylactica, 18, 151
Jones JB, 1993, Compendium of Tomato Diseases.
Moore WD, 1942, Some factors affecting the infection of tomato seedlings by Alternaria solani, Phytopathology, 42, 399
Pound GS, 1951, Effect of air temperature on incidence and development of the early blight disease of tomato, Phytopathology, 41, 127
Rotem J, 1994, The Genus Alternaria: Biology, Epidemiology and Pathogenicity.
Rotem J, 1990, The effect of age, nutrition and soil moisture on predisposition of cotton to infection by Alternaria macrospora, Phytopathologia Mediterranea, 29, 19
Saregiannis JA, 1936, Liste (II) des maladies des plantes cultivées et autres de la Gréce, Annals Institut Phytopathologique Benaki, 2, 8
VloutoglouI 1994.Epidemiology ofAlternaria linicolaon linseed (Linum usitatissimumL.).PhD Thesis University of Nottingham UK.
Vloutoglou I, 1999, Evaluation of tomato cultivars and hybrids for resistance to Alternaria solani infection, Annals of Applied Biology, 134, 48
Waggoner PE, 1969, Epidem: A Simulator of Plant Disease written for a Computer.