Abstract
Abstract The effectiveness of insecticides applied in early December to control black beetle larval populations in pasture was investigated on sand, loam, clay, and peat soils. Fensulfothion and isazophos, applied using a commercial granule spreader, gave, on average over all 10 sites larval reductions of 88% at 2 kg/ha, and 73% at i kg/ha rates. Liquid Isazophos applied by a ‘jet squirt’ techmque gave an average of 21% poorer control than broadcast granules. Diazinon granules gave poor control with average reductions of 41% at 2 kg/ha and 23% at 1 kg/ha rates. A wide range of soil moisture leve1s occurred over the 3-week post-application penod. Higher levels of control were achieved on moist organic peat soil (50% Mv) than on drier mineral sand and clay soils (15–37% Mv), with mtermediate control on podzolised loam soil (32% Mv). It was concluded that 1 kg/ha of fensulfothion or isazophos applied in November or early December when soil moisture levels are moderate will give control (e.g., 52–82% reductions) of black beetle larvae in pasture.
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