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Development of cercosporidium personatum in 3 peanut arachis hypogaea cultivar florunner canopy layers



Development of cercosporidium personatum in 3 peanut arachis hypogaea cultivar florunner canopy layers



Peanut Science 7(1): 46-49



Disease progress of late leafspot of peanut caused by C. personatum was monitored on the cultivar Florunner in unsprayed plots and in plots sprayed weekly with chlorothalonil (343 .mu.g active ingredient/ml H2O). The canopy was divided into 3 vertical semicircular leaf layers, each 15 cm high. Proportions of visible disease (xv) and defoliation (d) per leaf layer were estimated with a modified Horsfall-Barratt rating system. Total disease (xt) in each leaf layer and per plant were calculated with the equation xt = [(1-d) * xv + d]. Apparent infection rates (sensu Vanderplank) were calculated for xv, d, and xt in each leaf layer and for the total plant canopy. Rates of disease increase and defoliation on sprayed and unsprayed tissue were not significantly different (P = 0.05). Disease severity in plots sprayed with chlorothalonil usually lagged 3-5 days behind disease in unsprayed plots. The disease components xv, d, and xt were greatest in the bottom canopy layer. The rate of defoliation in the top leaf layer of unsprayed plots was significantly slower (P = 0.05) than that in the other 2 leaf layers, possibly because of dilution by the new plant growth. Chlorothalonil sprays reduced initial disease but did not reduce the rate of increase of C. personatum.

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Accession: 005132914

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