Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

The Citrus White-fly, Dialeurodes citri, in India and its Parasites, together with the Life-history of Aleurodes ricini, n.sp.

Abstract

Since mechanical means of bringing Dialeurodes citri, Ashm. (citrus white-fly) under control in California have proved unsuccessful, attempts are now being made to introduce natural enemies from the East. Internal parasites of D. citri in India are the Chalcids, Aphelinus fuscipennis, How., Prospaltella lahorensis[Encarsia lahorensis], How., and a new species of Prospaltella.
Aleurodes ricini, sp.n., is closely related to D. citri, and is also parasitized by Aphelinus fuscipennis and a species of Prospaltella. Though this Aleurodid has been previously recorded under this name, no full description of it has been published. A Coccinellid, Clanis soror, Wse., preys upon the larvae, puparia and egg-laying females, and larvae of Chrysopa spp. devour the larvae and the egg-laying females. A. ricini is a serious pest of Ricinus communis, which is so important as the food-plant of Attacus ricini [Samia cynthia ricini], Bofsd. All stages are passed on the lower surface of the leaves, where the eggs are laid in small clusters from the beginning of February. The larvae have four instars. The adults are active during the day, but become torpid with cold. All stages are found in numbers on the leaves from February to the end of November. Only in December and January does the number of adults become less. A complete life-cycle from July to September lasts 19-21 days.