Cucumber Beetle Seasonality in Coastal South Carolina1

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Abstract
In 1985 and 1986, adult striped cucumber beetles (STRCB) of both sexes became active in April at Charleston, S.C., and first-generation adults appeared in mid-June or mid-July. Overwintering STRCB were reproductive immediately after migration to host plants. Reproductivity of female STRCB declined in October, and more males than females were found throughout the season. Overwintering spotted cucumber beetles (SPCB) became active and oviposited on suitable hosts in late winter, and first-generation adults appeared in May; SPCB females entered diapause in October. Sex ratio of SPCB fluctuated during the year, with mostly females in winter and a greater proportion of males in summer. Densities of banded cucumber beetles (BCB) were lower during both years than the other species. Spring and early summer populations of BCB were low and gradually increased during the season. Reproductivity of BCB females did not decline in the fall, and more males than females were found. Densities of all three species were higher on zucchini squash than cucumber.

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