Sitophilus zeamais Motschulsky and Tribolium castaneum
(Herbst) are serious pests of stored products
worldwide (Rees 2004). Control of these insects depends
in large part on the application of chemical
insecticides, either as residual insecticides or as fumigants
(Subramanyam and Hagstrum 1996). The most
commonly used fumigants are methyl bromide, phosphine,
and sulfuryl ßuoride. Fumigants have a broad
spectrum of activity, penetrate deep into the grain and
leave few residues (Mueller 1990, Emekci 2010).However,
fumigation has some drawbacks; such as short
persistence, dangerous for applicators, resistant insect
populations (Bell and Wilson 1995) and damage to the
environment (Emekci 2010). Various groups of insecticides
such as organochlorines (lindane), organophosphates
(malathion), carbamates (carbaryl), and
pyrethroids (deltamethrin) are currently in use or
have been used as residual insecticides to control
stored-product insects. These insecticides are applied
Sitophilus zeamais Motschulsky and Tribolium castaneum(Herbst) are serious pests of stored productsworldwide (Rees 2004). Control of these insects dependsin large part on the application of chemicalinsecticides, either as residual insecticides or as fumigants(Subramanyam and Hagstrum 1996). The mostcommonly used fumigants are methyl bromide, phosphine,and sulfuryl ßuoride. Fumigants have a broadspectrum of activity, penetrate deep into the grain andleave few residues (Mueller 1990, Emekci 2010).However,fumigation has some drawbacks; such as shortpersistence, dangerous for applicators, resistant insectpopulations (Bell and Wilson 1995) and damage to theenvironment (Emekci 2010). Various groups of insecticidessuch as organochlorines (lindane), organophosphates(malathion), carbamates (carbaryl), andpyrethroids (deltamethrin) are currently in use orhave been used as residual insecticides to controlstored-product insects. These insecticides are applied
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