Abstract
Two methods of subsurface placement technology, high-pressure liquid injection (HPLI) and an adapted overseeder (OS), were used to apply isazophos (Triumph) to golf course roughs that were infested with Japanese beetle ( Popillia japonica Newman) grubs. In every instance (five trials with an emulsifiable concentrate formulation, one trial with a granular formulation), isazophos applied subsurface at 1.1 or 0.6 kg (AI)/ha performed as well or better than isazophos applied conventionally on the surface at 2.2 k (AI)/ha. This apparent enhancement of efficacy of isazophos should provide turf managers with an alternative that can reduce the amount of insecticide on turf, at least under certain field conditions. In addition, irrigation after application on plots treated with HPLI appeared to be less critical to efficacy of isazophos than on plots treated conventionally.
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