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Population Dynamics in the Squash Bug (Heteroptera: Coreidae)-Squash Plant (Cucurbitales: Cucurbitaceae) System in Oklahoma1
- Source :
- Journal of Economic Entomology. 81:1073-1079
- Publication Year :
- 1988
- Publisher :
- Oxford University Press (OUP), 1988.
-
Abstract
- The population dynamics of the squash bug, Anasa tristis (DeGeer), and the seasonal development of the squash plant, Cucurmta pepo L. variety ‘Hyrific,’ were monitored during 1984 and 1985. Numbers of squash bugs increased dramatically throughout the season. Overwintered adults and subsequent oviposition occurred soon after plant emergence. The development of first-generation nymphs and adults slowly increased the total number of squash bugs in the field. The development of a second generation caused a pronounced increase in the total numbers present. The numbers of nymphs, adults, and eggs in the field increased at an exponential rate beginning about Julian date 192 (10 July). Late in the season the rate of oviposition decreased. Squash bugs complete two to three generations per year in Oklahoma. Our data suggest that early-season control of squash bugs is essential to prevent high densities of insects from occurring late in the year. Mean plant leaf area and the number of leaves followed a sigmoid-shaped growth curve, increasing slowly early in the season, becoming faster through midseason, and slowing again late in the season. The numbers of flower buds, flowers, and immature and mature fruit also followed a sigmoid-shaped growth curve throughout the season.
Details
- ISSN :
- 1938291X and 00220493
- Volume :
- 81
- Database :
- OpenAIRE
- Journal :
- Journal of Economic Entomology
- Accession number :
- edsair.doi...........1cc24337e3c635d42ddc48ffb450704f
- Full Text :
- https://doi.org/10.1093/jee/81.4.1073