Functional and Behavioral Responses of the Natural Enemy Anthocoris nemoralis to Cacopsylla pyri, at Different Temperatures

Abstract Anthocoris nemoralis is the dominant predator of pear sucker ( Cacopsylla pyri ) in UK. migrates into orchards spring or introduced as a biocontrol agent, reaching peak population levels July-August, contributing to effective control summer populations. However, due temperature dependent development and metabolism there are concerns that C. populations feeding rates may increase changing climatic conditions. Thus, how A. responds temperature, impacts its ability agent. Functional response assays, monitoring attack rate handling time behavioral using Ethovision tracking software occurred, assess impact on predation. Experiments were conducted at current future July-August mean temperatures, predicted RCP4.5 RCP8.5 (medium high, representative concentration pathway) emissions scenarios, 2018 UK Climate Projections (UKCP18). All treatments demonstrated Type II functional response, with female anthocorids demonstrating shorter times higher than males. Males showed longer prey 18 °C compared 23 more was spent active lower temperatures for both sexes. Females did not show significant differences temperature. Overall consumption also significantly affected by either sex. This study suggests likely remain natural enemies under non-significant consumption.