Seven biological control agents have been released on the environmental weed Chrysanthemoides monilifera in Australia and two are widely established on infestations of C. monilifera subsp. rotundata in New South Wales. Five pesticides were screened for their impact on seed production of C. monilifera and two on the survival of the agent Comostolopsis germana, a shoot tip-feeding lepidopteran. The insecticides carbaryl, carbofuran, dimethoate, fluvalinate and the fungicide benomyl had no significant effect on seed production of C. monilifera when applied over a period of four months. Numbers of C. germana larvae were readily suppressed after three months by applications of fluvalinate or a mixture of carbaryl, carbofuran and dimethoate. Shoot growth was not affected by applications of carbaryl, dimethoate and benomyl. It is concluded that exclusion by pesticides of biological control agents is a valid method of measuring the impact of agents on C. monilifera.
Biocontrol Science and Technology
Volume 9, 1999 - Issue 3
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