Journal of Biological Control

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The neotropical plant Parthenium hysterophorus L. (Asteraceae) is a serious weed of agricultural fields, pastures and waste lands in most parts of India (Krishnamurthy et al., 1977). The mexican beetle Zygogramma bicolorata Pallister (Coleoptera : Chrysomelidae), releases of which were iniitiated in 1984 (Jayanth, 1987), is proving to be a promising biological control agent in and around Bangalore (Jayanth and Geetha Bali, 1990). A number of weedicides have been recommended for the control of, P.hysterophorus in India (Krishnamurthy et al., 1977 ; Muniappa et 01., 1980; Challa, 1987). In situations where chemical methods are preferred, it would be ideal to use weedicides that are least harmful to Z.bicolorata. With this in view, the impact of some commonly used weedicides were tested for their safety to the beetle.

Keywords

Zygogramma bicolorata, Parthenium hysterophorus, Biological Control, Weeds, Effect of Weedicides.
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