Insecticidal and Repellent Activity of some Pesticides and Plant Oils against Alfaalfa Weevil, Hypra brunneipennis (Boheman) (Coleoptera: Curculionidea).

Document Type : Original Article

Author

Plant Protection Department, Faculty of Agriculture, Minia University, Minia, Egypt.

Abstract

The Alfaalfa weevil, Hypera brunneipennis is a major pest of alfalfa in Egypt. In this research two pesticticides (Emamectin benzoate α Neeemix) and two plant oils (Camphor α Coriander) were evaluated for their efficiency in the control of the secand larval instar and adults of  H. brunneipennis under laboratory condition.The LC50 and LC90 values of these compounds against the 2nd instar larvae and adults of Hypera brunneipennis were calculated at 24, 48, 72 and 96 hours.According to the LC50 and LC90, it could be concluded that the highest potent compound was Emamectin benzoate followed by Neemix.  On the other hand, in choice tests with adults of this pest (LC25 concentration) the highest repellency  properties was with Neemix and the plant oil of Camphor treatment (5 and 17.5% weevils in treated side, respectively), followed by Coriander plant oil (25%), But, the treatment with Emamectin benzoate have significantly less repelling properties (55.8%) after 72 hr post treatment.

Keywords

Journal of Plant Protection and Pathology
Volume 11, Issue 12
December 2020
Pages 601-606

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