Acaricidal effects of biocide compound, biony (Beauveria bassiana) (Balsamo) and certain plant extracts on some biological aspects of two-spotted spider mite, Tetranychus urticae (koch.)

Document Type : Original Article

Author

Department of Pesticides Fac. of Agric., Kafr El-Sheikh, Tanta Univ., Egypt.

10.21608/jpces.2005.459498

Abstract

 


 
 




The present study evaluated the residual effects of entomopathogenic fungi, Beauveria bassiana (Balsamo) and two plant extracts (black cumin and wonnseed) on two-spotted spider mite, Tetranychus urticae (Koch.). Plant extracts were also evaluated when combined in mixtures with an acaricide fenpyroximate. Results indicated that Biofly was the highly toxic to adult female mites (LC50 48403 conidia / ml). Black cumin extract had a moderate toxicity (LC50 1861.3 ppm). Pronounced potentiation was observed when fenpyroximate mixed with the two tested plant extracts. Biofly was more toxic to older eggs than to younger ones (LCso 23531, 29061.71 and 34951 conidia / ml, for 3, 2 and I days old eggs, respectively). Black cumin and wormseed were the least toxic compounds to treated T. urticae eggs (LC50 6744, 8027, 5051, 6011, 3219 and 4949.91 ppm, respectively). Biofly had a little effect on mite fecundity, but black cumin and wormseed were highly reduced the number of eggs deposited. Black cumin had a moderate effect on egg-hatchability, while Biofly and wormseed extracts were the least effective ones. Black cumin had a moderate effect on sterility followed by wormseed and Biofly respectively. The tested plant extracts and Biofly had the ability to elongate the duration needed for all immature stages and life cycle, while they were able to decrase oviposition period and the adult female longevity.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 13, Issue 1
June 2005
Pages 29-49

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