β Scribed by Timothy H Sanders; Daniel W Gorbet; Fred M Shokes; E Jay Williams; Jack L McMeans
No coin nor oath required. For personal study only.
Yield, disease rating, seed quality and seed size parameters were determined from four peanut (Arachis hypogaea L ) genotypes with different levels of resistance to leajipot to evaluate the eflects of' controlling peanut leqfipot with chlorothalonil. In 1981 and 1983, main plot treatments were (i) no fungicide applications, (ii) applications of chlorothalonil(1242 g ai h a -' ) at 14-day intervals, and (iii) applications of chlorothalonil (1242 g ai h a -' ) at 20-day intervals. After shelling, a narrow seed size range (<8.33 mm< 7.14 mm width) was used to reduce maturity effects in analyses of ,free jatty acids, total curbonyls, carbohydrates, oil content, and fatty acid profile. Oil content increased signi$cantly with spray jiequency in both years only in Southern Runner, and treatment differences in all genotypes were no more than 1.7%. Oleic and linoleic acid decreased and increased, respectively., with increased spray frequency in Florunner (susceptible) and the resistant genotype with the highest unsprayed disease rating. Florunner median seed size for the unsprayed treatment (8.07 mm) was signijicantly smaller than the median sizes for the 20-day interval (8.15 mm) and 14-day interval(8.16 mm) treatments.
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