Biology of sweetpotato bug, Physomerus grossipes Fabr. (Coreidae, Hemiptera).
The life cycle and biology of Physomerus grossipes were observed on sweet potatoes in the laboratory and field in the Philippines. Eggs were laid in groups on the underside of leaves. The eggs had an incubation period of 15.82 days: 86.8% of them hatched. There were 5 nymphal instars. Total mean developmental period was 85.45 days for males and 87.69 days for females. Adult males and females were similar in general appearance except that the last abdominal segment of the male was more pointed than that of the female and the hind leg of the male had a characteristic spine. The coreids were most abundant from January to April and least abundant from July to August. One eulophid parasitoid was observed on field-collected eggs. P. grossipes would feed on 3 species (Ipomoea aquatica, I. triloba and Bacella rubra) of 9 plants, commonly associated with sweet potato in the field, that were tested.