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Insecticide Resistance and Genetics in Spodoptera litura of Pakistan (Paperback)
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Insecticide Resistance and Genetics in Spodoptera litura of Pakistan (Paperback)
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Spodoptera litura causes enormous losses in many economically
important crops. Three years monitoring of conventional and new
chemistry insecticides revealed chlorpyrifos, quinalphos,
deltamethrin, -cyfluthrin, emamectin and indoxacarb more toxic than
other insecticides against most field populations. Cypermethrin and
deltamethrin with fipronil showed synergistic effect both at 1:1
and 1:10 in field populations. However, these populations were
highly antagonistic to organophosphates when mixed with synthetic
pyrethroids. Using single pair crosses for genetics studies,
deltamethrin and indoxacarb showed autosomal and incompletely
dominant resistance controlled by more than one locus. Enzyme
inhibitors i.e., PBO and DEF were significantly not different for
both field populations suggesting involvement of both mechanism of
resistance. Timely judgment of pest status, delimiting alternate
host crops and weeds, wise rotation of insecticides with new
chemicals and insect growth regulators with synergistic mixtures
might be an asset for management of this insect pest. Stability and
dominance of resistance and cross-resistance suggest use of
insecticides with different modes of action.
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