Effect of a commercial insecticidal soap on greenhouse whitefly (Hom: Aleyrod.) and its parasitoid, <i>Encarsia formosa</i> (Hym: Euloph.)

Authors

  • G. S Puritch Pacific Forest Research Centre Environment Canada Victoria, B.C.
  • N. V. Tonks Saanichton Research Station Agriculture Canada Sidney, B.C.
  • P. Downey B.C. Ministry of Agriculture Victoria, B.C.

Keywords:

whitefly, <i>Encarsia formosa</i>, Hymenoptera, Eulophidae,

Abstract

Safer’s Insecticidal Soap (IS) was topically applied at six concentrations to all growth stages of greenhouse whitefly as well as larvae and adults of the whitefly parasitoid, the eulophid wasp <i>Encarsia formosa</i>. IS at 0.5% ai caused more than 94% mortality of all whitefly larval stages and adults, and more than 82.5% mortalitv of whitefly pupae. Adults hatched from treated pupae occasionally showed altered development. E. formosa adults were more tolerant to IS than whitefly and 81.5% survived a 0.5% IS treatment. It was concluded that IS is an effective pesticide for greenhouse whitefly and should be integrated with E. formosa in greenhouse trials.

References

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Harbaugh, B.K. and R.H. Mattson, 1976. Insecticide effects in Encarsia formosa Gahan, parasite of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood). J. Amer. Soc. Hort. Sci. 101: 298-233.

Harris, K.M. 1974. Notes from Wisley: Glasshouse whitefly. J. Royal Hort. Soc. 99:158-162.

Puritch, G.S. 1978. The biocidal effects of fatty acids on various forest pests. Symposium on the pharmacological effects of lipids. AOCS Monograph No. 5:105-112.

Puritch, G.S., P.C. Nigam, and J.R. Carrow. 1980. Chemical control of balsam woolly aphid (Homoptera: Adelgidae) on seedlings of Abies amabilis. J. Entomol. Soc. Brit. Columbia. 77:15-18.

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Published

2019-09-06

Issue

Vol. 79 (1982): Journal of the Entomological Society of British Columbia

Section

Articles

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