Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Influence of honeydew of citrus mealybug (Planococcus citri) on searching behaviour of its parasitoid, Anagyrus pseudococci.

Abstract

Laboratory experiments were conducted in 1991-92 to investigate the foraging behaviour of Anagyrus pseudococci, a parasitoid of Planococcus citri, on leaves contaminated with honeydew and clean leaf surfaces of tomato. The presence of honeydew increased the searching activity of the parasitoid. On encountering the honeydew-contaminated area, A. pseudococci walked more slowly and stopped frequently. The proportion of time spent moving and net walking speed of the parasitoid was lower on honeydew-contaminated leaves than on clean ones. Parasitoids turned more often per unit distance on honeydew-contaminated areas than on clean areas. On losing contact with honeydew-contaminated areas, A. pseudococci returned quickly to the previous area, a klinokinetic response. Inexperienced parasitoids walked more slowly and remained in the contaminated areas longer than experienced individuals.