Abstract
Granular fonofos, and granular AC 92100 [ O, O -diethyl S-( t -butylthio) methyl phosphorodithioate], each at 2 lb AI acre in-furrow, gave excellent protection of potatoes against wireworms in irrigated soils of southern Alberta. Fonofos was particularly effective over 2 consecutive years and provided better control than registered chlordane or carbofuran in-furrow broadcast. Chlordane and carbofuran were not significantly better than the checks in several tests, and HCS-3260 (alpha gamma chlordane) was no more consistent in its protection of potatoes than was chlordane. Fensulfothion, ( O, O -diethyl O-p -[(methylsulfinyl)phenyl] phosphorothioate), applied in-furrow or broadcast, gave variable tuber protection but appeared to be slightly better than chlordane or carbofuran. Fonofos, AC 92100, fensulfothion, and PP211 [ O, O -diethyl O -(2-diethyl-amino-4-methyl-6-pyrimidinyl) phosphorothioate] were as effective against the sugarbeet wireworm, Limonius californicus (Mannerheim), as against the prairie grain wireworm, Ctenicera aeripennis destructor (Brown).
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