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Laboratory and field evaluation of isofenphos for scarabaeid grub coleoptera scarabaeidae control in turf grass



Laboratory and field evaluation of isofenphos for scarabaeid grub coleoptera scarabaeidae control in turf grass



Journal of Economic Entomology 75(5): 906-912



Isofenphos (1-methylethyl 2-[[ethoxy[(1-methylethyl)amino] phosphinothioyl]-oxy]benzoate) was equally effective on cyclodiene-resistant and susceptible 1st-instar European chafer, Rhizotrogus majalis (Razoumowsky). Japanese beetle, Popillia japonica Newman, 1st instars were more susceptible than the European chafer. On 3rd-instar European chafers, initial action of isofenphos was slower than diazinon but eventually surpassed the latter, especially at lower temperatures. Isofenphos at rates of 1.7-2.2 kg of AI[active ingredient]/ha applied during April and May or midsummer were highly effective in controlling European chafer, Japanese beetle, and Oriental beetle, Anomala orientalis Waterhouse, grubs during the summer and fall. Second-year residues of isofenphos were present in sufficient quantities to produce significant grub mortality in some cases. In the above-ground vegetation, isofenphos residues of the 6E formulation were initially higher than with the 5G formulation, but both were nearly dissipated by 15 weeks. Soil residues in the 0- to 1.3-cm depth were 2.5 to 10 times greater than in the 1.3- to 3.8-cm depth during the 1st 15 wk.

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Accession: 005787375

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