Effect of imidacloprid granules on subterranean termite foraging activity in ground-touching non-structural wood

A field trial was conducted to examine the impact of new granular formulation ofimidacloprid on subterranean termite foraging activity and infestation in ground-touching non-structural wood and the longevity of the effect. The trial was carried out in an urban forest with high termite populations and a floor relatively free from brush or deciduous ground cover. The percentages of monitor wood blocks infested and having active termites were reduced to 50% and >33%, respectively in population control. The estimated damage rates of monitor wood blocks were also significantly lower in treated than those in control plots. The control effect can last for at least 7 months.