Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effect of buprofezin on Icerya purchasi and Planococcus citri.

Abstract

Icerya purchasi and Planococcus citri nymphs were exposed to aqueous suspensions of 25% wettable buprofezin powder [an insect growth regulator] (0.0008-0.05% a.i.) in the laboratory. Dipping lemons in 0.002, 0.01 and 0.05% a.i. resulted in 91-99% nymphal mortality of P. citri, while 100% mortality was recorded when I. purchasi crawlers or 2nd-instar nymphs were exposed to 0.05% sprays; 3rd-instar I. purchasi nymphs were less susceptible (51% mortality). Death of the early stages occurred mainly during moulting to the 2nd instar. At 0.05%, sprays applied to adults slightly reduced fecundity and decreased egg hatch to 31% for I. purchasi and to 7-49% for P. citri, depending on the exposure period of the females. At 0.05%, buprofezin showed strong ovicidal activity on P. citri, resulting in over 80% inhibition of egg hatch.