Yellow Cotton Pollen Suppresses Growth of Larvae of Tobacco Budworm 12

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Abstract
Studies were conducted over a 2-yr period to determine the effects of yellow pollen on the growth of larvae of the tobacco budworm Heliothis virescens (F.). In 1977, tobacco budworm larvae were fed cream or yellow cotton, Gossypium hirsutum L., pollen of field grown DES-24 cotton. In 1978, the study was repeated 3 times with cream and yellow pollen of DES-24 and of 4 additional cotton genotypes. In the 1977 study, after 7 days of feeding, mean larval weights were 117.1 and 134.4 mg for larvae fed yellow and cream pollen, respectively. In 1978, mean larval weights were 179.2 and 211.3 mg for yellow and cream pollen diets, respectively. This represents a significant reduction (13 and 15%) in tobacco budworm larval weights for both years.