Abstract
Herbivorous and carnivorous feeding by Geocoris punctipes (Say) on nectaried and nectariless cotton with and without Heliothis virescens (F.) eggs was measured using the radionuclides of carbon (14C) and phosphorus (32P). Leaf material ingested by C. punctipes was measured as percentage of leaf sample disintegrations per min and was significantly greater for insects on nectaried cotton without eggs (12.08%) than on plants in the other treatments. Plant feeding was not significantly different on nectaried cotton with eggs (3.34%), nectariless cotton with eggs (1.97%), and nectariless cotton without eggs (0.35%). G. punctipes egg ingestion was not significantly different on the nectaried or nectariless cottons.
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