Effects of climate change on different geographical populations of the cotton bollworm Helicoverpa armigera (Lepidoptera, Noctuidae)

Abstract

The effects of climate change on pest phenology and population size are highly variable. Understanding the impacts of localized climate change on pest distribution and phenology is helpful for improving integrated pest management strategies. Here, the population dynamics of cotton bollworms (Helicoverpa armigera) from Maigaiti County, south Xinjiang, and Shawan County, north Xinjiang, China, were analyzed using a 29‐year dataset at lower latitudes and a 23‐year dataset at higher latitudes to determine the effects of climate change on the population dynamics of H. armigera. The results showed that all generations of H. armigera at both sites showed increasing trends in population size with climate warming. Abrupt changes in phenology and population number occurred after abrupt temperature changes. Climate change had a greater effect on the phenology of H. armigera at higher latitudes than at lower latitudes and led to a greater increase in population size at lower latitudes than at higher latitudes; the temperature increase at higher latitudes will cause a greater increase in the adult moth population size in the future compared to that at lower latitudes; and abrupt changes in the phenology, temperature increase, and population size at lower latitudes occurred earlier than those at higher latitudes. Thus, it is necessary to develop sustainable management strategies for Helicoverpa armigera at an early stage.

Bat activity correlated with migratory insect bioflows in the Pyrenees

“…Studies have shown high levels of pesticide resistance in this species [ 59 ], and spread of this resistance may be aided by its migratory behaviour as is the case with the diamondback moth ( Plutella xylostella ). This moth is expected to expand its range northwards and increase its populations due to climate change [ 60 ] so research into the climatic drivers of its migration could prove to have important implications for understanding and preventing its spread.…”

Suitability of Satellite Imagery for Surveillance of Maize Ear Damage by Cotton Bollworm (Helicoverpa armigera) Larvae

“…The CBW is a drought and heat-tolerant species; arid and hot weather promotes its population growth, resulting in high larval abundance [3]. Global warming has increased CBW adult populations [7,8]. Climate change has made an impact on the life cycle of CBW.…”

“…Climate change has made an impact on the life cycle of CBW. The number of days from adults' first and last appearance showed abrupt changes recently, corresponding to changes in degree days [8,9]. Therefore, as the frequency of arid years increases, more severe CBW damage is expected worldwide [10].…”