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A problem in the use of the fungus Metarhizium flavoviride Gams & Rozsypal to control locusts is that the locust continues eating for the first few days after the fungus has been applied. Applying a dose of 13 000 spores per locust to adult Locusta migratoria migratorioides (Reiche & Fairmaire) in 10 ppm cypermethrin (approximately LC(10), even 7 days after dosing) inhibited feeding by 50% on day 1 after treatment and advanced the onset of locust mortality from the fungus by 48 h. A similar inhibition of feeding from the cypermethrin also occurred in combination with doses of fungus as low as 375 spores per locust, but the earlier locust mortality was not then observed. It was also determined that cypermethrin was not toxic to M. flavoviride in in vitro tests.