A trial was conducted with 12 monthly sowings from December, 1976 to November. 1977 with blackgram (CO 2) at Coimbatore to study the seasonal incidence of stem fly Ophiomyia phaseoli Tryon. The study revealed that the stem fly incidence was minimum in September. October and November sown crops and was maximum in March, July and August sown crops. The stem fly incidence on 45th day after sowing was positively corre lated with total rainfall during the corresponding period and was not correlated with other weather focrors.
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Tamil Nadu Agricultural University
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