Estimating temperature effects on Drosophila suzukii life cycle parameters

Abstract

Drosophila suzukii is an invasive, polyphagous pest of soft-skinned fruits, having huge impact on fruit production in Asia, North and South America and Europe including Germany. 2 To investigate the effect of temperature on oviposition, egg-to-adult development success and duration, as well as immature heat survival and adult cold survival for a German D. suzukii population several experiments were conducted under different constant temperatures in the laboratory. The resulting life cycle data were described mathematically as functions of temperature and compared with experimental results of other researchers in a summary table. 3 Curve fittings used herein revealed that minimum, optimum and maximum temperatures are: 13.2, 26.7 and 33.6 ∘ C for oviposition, 14.1, 22.6 and 30.0 ∘ C for egg-to-adult development success, and 9.6, 27.3 and 35.7 ∘ C for egg-to-adult development duration. Eggs and larvae of D. suzukii showed a reduced heat survival within the tested temperature range of 29 to 41 ∘ C and exposure durations from 1 to 8 h. A cold survival rate of 50% was measured at e.g. −6 ∘ C for 4 h in summer morph adults and at e.g. −6 ∘ C for 45 h in winter morph adults confirming that the latter are more cold tolerant. 4 Results obtained in this study for a German population of D. suzukii are similar to those obtained for populations of other origins such as Canada, Japan, Spain and USA. Thus, presumably, present data based on a German D. suzukii population can be used for a new or fine-tune of already existing population dynamics models of D. suzukii in order to support an effective pest management strategy.

Modeling-informed Engineered Genetic Incompatibility strategies to overcome resistance in the invasive Drosophila suzukii

“…In a recent analysis of >10,000 wild SWD, targetable regions can be found with SNP frequencies <0.1% for single targets and could be expected at ≤ 0.2% for 2 targets ( 26 ). However, as evidence grows for SWD overwintering, the population replacement behavior of EGI in the late season may allow the treatment of a field one year to seed such genotypes in the next ( 33 , 34 ). In warmer climates, with year round SWD populations, enduring resistance would be even more damaging to the efficacy of EGI.…”

Invasive Pest and Invasive Host: Where Might Spotted-Wing Drosophila (Drosophila suzukii) and American Black Cherry (Prunus serotina) Cross Paths in Europe?

“…Future climate change might weaken the filtering effect of freezing (i.e., decreased mortality due to the freezing of body fluids) [64]. Additionally, winter temperature has been observed to be one of the key factors affecting the life history of our target species [37,[65][66][67][68]. For example, the phenotype of this pest insect can be altered by exposure to low temperatures in winter [69].…”

“…Climatic conditions have major effects on the development, reproduction, phenology, and behavior of spotted-wing drosophila [2,[35][36][37]. Climatic conditions might play a major role in determining the potential range of spotted-wing drosophila.…”

The use of insect life tables in optimizing invasive pest distributional models

“…These data were collected from http://worldclim.org and used to fit our ecological niche models. We focused on variables associated with temperature because temperature is the primary driver of physiological processes in D. suzukii (Wiman et al 2014, Winkler et al 2021). However, we also collected data on annual precipitation (BIO12), which affects D. suzukii distribution (Winkler et al 2020).…”