Wd. Woodson et al., NORTHERN CORN-ROOTWORM (COLEOPTERA, CHRYSOMELIDAE) TEMPERATURE REQUIREMENTS FOR EGG DEVELOPMENT, Annals of the Entomological Society of America, 89(6), 1996, pp. 898-903
Temperature-dependent development of laboratory-wintered eggs of north
ern corn rootworm, Diabrotica barberi Smith & Lawrence, was described
using data from constant temperature laboratory experiments. Median de
velopment of postdiapause eggs at constant temperatures of 15, 18, 20,
23, 25, 27, and 30 degrees C required 59, 30, 24, 17, 15.5, 14, and 1
4 d, respectively. Linear and nonlinear models were fitted to temperat
ure versus developmental rate data. Variation in developmental rates a
cross temperatures was modeled with a cumulative Weibull distribution.
Mean developmental rate was linear between 15 and 27 degrees C, optim
al at 27 degrees C, and decreased at 30 degrees C. The thermal thresho
ld for development (10.9 degrees C) was determined by extrapolation wi
th median egg hatch occurring after 238 DD (10.9).