Relationship between meteorological factors and the occurrence of ergot disease (Claviceps microcephala)of Pearl Millet

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Abstract
Using 4 meteorological factors, i.e., atmospheric temperature, relative humidity, sunshine and rainfall, an attempt was made to determine, by a curvilinear regression method, the optimum values for C. microcephala (Wallr.) Tul. on Pearl millet. The optimum values for initiation and spread of the disease were found to be 12 mm mean rainfall, 6 h/day mean sunshine, 75% mean relative humidity and 20.degree. C mean atmospheric temperature from protogyny to early flowering of pearl millet. To quantify the relative importance of these meteorological factors, the coefficient of determination was calculated and this showed that atmospheric temperature contributed 45%, relative humidity 35%, sunshine 10% and rainfall 5% towards the total variation of the ergot infection index.

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