Environmental Entomology (1994) 23, 1224-1234

G.J.R. Judd and H.L. McBrien (1994)
Modeling temperature-dependent development and hatch of overwintered eggs of Campylomma verbasci (Heteroptera: Miridae)
Environmental Entomology 23 (5), 1224-1234
Abstract: Temperature-dependent development of laboratory- and field-wintered eggs of Campylomma verbasci (Meyer) was described using data from constant-temperature laboratory experiments. Time required for hatch of overwintering eggs declined throughout winter until the end of February, after which increasing exposure to cold conditions had no effect on median hatching time. Developmental rates of nondiapausing overwintered eggs were compared at 5.0, 8.8, 9.4, 12.9, 15.0, 18.0, 20.9, 23.0, and 25.8°C. Variation in developmental rates across temperatures was modeled (R² = 0.99) with a cumulative Weibull distribution. A nonlinear, six-parameter developmental model with low- and high-temperature inhibition accurately described (R² = 0.99) median developmental rates of all temperatures. Least-squares linear regression (rate = -0.05017 + 0.00545 [temp]) described development in the linear region (12.9-20.9) of the development curve. The lower developmental threshold (9.2 ± 0.1°C) was determined by extrapolation of the linear regression through the x-axis. This relationship predicted that median (50%) development required 183 ± 1.2 degree days above the base temperature. The linear degree-day model and a stochastic simulation model incorporating the Weibull distribution and nonlinear development model were validated using field phenology data from several sites and years. Using daily air-temperature minima and maxima and a starting date of 1 January, the degree-day model was 5.2 ± 4.3 d late and the simulation model -0.5 ± 3.4 d early in predicting median hatch of overwintered eggs. Both models were more accurate than a (6.6 ± 5.0 d late) previously developed empirical index. This article discusses the use of phenology models in the management of C. verbasci.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Campylomma verbasci		Canada (west)