Inhibitory Effects of Insecticides on Entomogenous Fungi Metarhizium Anisopliae and Beauveria Bassiana

Document Type

Article

Journal/Book Title/Conference

International Rice Research Institute Newsletter

Volume

9

Issue

6

Publication Date

1-1-1984

First Page

16

Last Page

17

Abstract

The effect on spores of Metarhizium anisopliae and Beauveria bassiana of insecticides recommended for the control of the brown planthopper [Nilaparvata lugens] and of insecticides that cause resurgences of this pest on rice was studied in the Philippines. The insecticides were mixed into the culture medium before planting or were surface-applied to hardened media. All insecticides significantly reduced spore germination of both fungi, M. anisopliae being the more sensitive. The recommended insecticides (monocrotophos, BPMC [fenobucarb], carbosulfan, and a mixture containing azinphos-ethyl and fenobucarb) reduced germination more than did the resurgence-causing insecticides (azinphos-ethyl, deltamethrin, parathion-methyl and MIPC [isoprocarb]), probably because a higher dose of the recommended insecticide was applied.

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