Pesticidi i fitomedicina 2017 Volume 32, Issue 3-4, Pages: 217-222
https://doi.org/10.2298/PIF1704217P
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Residual efficacy of cypermethrin and pirimiphos-methyl against Sitotroga cerealella (Olivier) in wheat grain
Pražić-Golić Marijana (Institute of Pesticides and Environmental Protection, Belgrade)
Kljajić Petar (Institute of Pesticides and Environmental Protection, Belgrade)
Andrić Goran 
(Institute of Pesticides and Environmental Protection, Belgrade)
Residual efficacy of EC formulations of two insecticides: cypermethrin
supplemented with the synergist piperonyl butoxide, and pirimiphos-methyl,
against adults of the Angoumois grain moth, Sitotroga cerealella (Olivier),
was investigated in the laboratory (at 25±1°C and 55-60% r.h.) by applying
water solutions of products based either on cypermethrin (1.6 mg a.i./kg of
wheat grain) or pirimiphos-methyl (4 mg a.i./kg of wheat grain) to wheat
grain. Insect mortality on deposits of different age: 0, 7, 14, 30, 60, 90,
120, 150 and 180 days was estimated after 2, 7 and 14 days of insect exposure
to treated wheat. After 2 day exposure, cypermethrin caused mortality of up
to 46% on all deposits (age 0-180 days). After 7 days of exposure, high
efficacy (94-100%) was found only on deposits that were up to 90 days old,
while the mortality of S. cerealella adults on all deposits following 14 days
of exposure was 98-100%, and it was probably additionally enhanced by natural
mortality. Pirimiphos-methyl was 98-100% effective after 2 days of exposure
to deposits that were up to 30 days old, while it achieved maximum efficacy
(100%) after 7 days of insect exposure to deposits aging for up to 150 days,
and 94% efficacy on 180 days old deposits. After 14 days of adult exposure to
all deposit ages, there were no surviving insects (efficacy 100%). The
results show that pirimiphos-methyl was more effective against S. cerealella
adults and had a longer residual activity than cypermethrin.
Keywords: sitotroga cerealella, cypermethrin, pirimiphos-methyl, residual efficacy, wheat
Project of the
Serbian Ministry of Education, Science and Technological Development, Grant
no. III 46008