NDLI: Western corn rootworm egg hatch and larval development under constant and varying temperatures

Content Provider	Springer Nature Link
Author	Wilstermann, Anne Vidal, Stefan
Copyright Year	2013
Abstract	Predicting western corn rootworm (Diabrotica virgifera virgifera LeConte; WCR) development in the field depends on models that use experimentally determined degree-days (°D). For constant temperature regimes, this temperature sum can be reliably used to predict hatch and development of WCR larvae. In the first experiment in climate cabinets, we evaluated the effects of varying day–night (4 and 6 °C difference) temperature regimes compared to equivalent constant temperature regimes on hatch, development, and recovery of WCR larvae from a non-diapausing population. Relative to constant diurnal temperatures, varying day–night temperatures resulted in earlier larval hatch and accelerated larval development (especially when day–night temperatures differed by 6 °C) due to direct temperature effects (i.e., the Kaufmann-effect) and to enhanced plant growth. For WCR eggs, the temperature sums needed for hatch in the field are overestimated when they are determined by models based on constant experimental temperatures. Recovery of larvae from soil was not affected by temperature, but was positively associated with plant height. In a second experiment we evaluated whether the found effect of varying temperature ranges on the acceleration of larval hatch is also influenced by the level of these varying temperatures. Initial hatch started earlier by varying diurnal temperatures only under a low-temperature regime (14 ± 4 °C). For herbivorous insects like WCR, plant growth effects induced by varying temperature regimes may result in increased variation in temperature-based developmental parameters. Consideration of these effects will improve models that predict WCR hatching patterns and will improve the development and timing of control strategies.
Starting Page	419
Ending Page	428
Page Count	10
File Format	PDF
ISSN	16124758
Journal	Journal of Pest Science
Volume Number	86
Issue Number	3
e-ISSN	16124766
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-04-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diabrotica virgifera virgifera Control strategies Temperature-dependent development Kaufmann-effect Degree-days Entomology Agriculture Plant Pathology Ecology Forestry Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science Ecology, Evolution, Behavior and Systematics Insect Science Agronomy and Crop Science

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