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Abstract
A statistical analysis of weekly mean meteorological factors like minimum temperature, maximum temperature, relative humidities, sunshine hours, rainfall and seasonal index of the yearly percentage infestation of spotted bollworm (earias spp.) in cotton crop grown at Surat in Gujarat State during 1962-80 is done by applying simple and multi-correlation regression techniques. Sunshine hours during squaring period, relative humidity and rainfall during flowering period, minimum and maximum temperatures at the time of boll formation play an important role in the infestation. Flower buds and bolls are most vulnerable parts of the crop. Heavy incidences occur in parts of west Uttar Pradesh, Vidarbha, Gujarat, north Interior Karnataka and Andhra Pradesh during months of September to November which is mostly boll-formation stage period lor the crop growth.
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