The role of predator‐prey size ratio in determining the efficiency of capture by <i>Anthocoris nemorum</i> and the escape reactions of its prey, <i>Acyrthosiphon pisum</i>

Abstract

Abstract Laboratory experiments are described which give the efficiency of Anthocoris nemorum in capturing its aphid prey Acyrthosiphon pisum. The efficiency of capture increases as the predator‐prey size ratio increases. The relationship holds through all the anthocorid developmental stages. Aphid escape reactions are made up of three basic components; kicking, walking or dropping off the plant. These reactions are all related to the predator‐prey size ratio. Kicking is most successful at small ratios while dropping is most successful at high ratios. Walking occupies an intermediate position but has a generally lower probability of success.