Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effects of sinigrin on host selection by aphids.

Abstract

An account is given of studies on the feeding response of six species of aphids to sinigrin, a mustard oil glucoside,. Sinigrin was a strong phagostimulant for Hyadaphis erysimi (Kalt.) and Brevicoryne brassicae (L.), which feed mainly on Cruciferae. H. erysimi was induced to feed on ten species of plants that it does not normally attack when the leaves were treated systemically with sinigrin. To a lesser degree, Myzus persicae (Sulz.) was induced to feed on leaves of plants not normally attacked by treating the leaves with sinigrin. Two polyphagous species, Aphis fabae Scop. and Aulacorthum solani (Kalt.), which do not attack Cruciferae, and Acyrthosiphon pisum (Harris), which is restricted to Leguminosae, were deterred from feeding on the leaves of broad bean (Vicia faba) when these had been treated with sinigrin; the greatest response was shown by A. pisum.Detailed studies with H. erysimi indicated that sinigrin affects several phases of feeding behaviour. Initially, water vapour arrests flight activity of the alates and stimulates test probing. Alates detected sinigrin (applied topically to leaves of V. faba) during test probes and subsequent behaviour was similar to that on the usual food-plants. Studies on the penetration of the stylets through Parafilm membranes into various solutions and electronic monitoring of the feeding activity of apterae on sinigrin-treated leaves of plants not normally attacked suggested that sinigrin acts as a stimulant for stylet penetration and assists the finding of the phloem sieve elements.