Studies on development of a novel trunk injection agent against the pine wilt disease, Part 2. Development of a water-soluble preparation of emamectin benzoate and its preventative effect against the wilting of pot-grown pine trees inoculated with the pine wood nematode, Bursaphelenchus xylophilus

Water-soluble preparations have been investigated to develop a trunk inject ion agent based on the poorly water-soluble anti-nematode emamectin benzoat e. Following tests on the photoxicity of some solvents and solubilizers and demonstration of the ability of some solubilizers to dissolve emamectin be nzoate in water, acetone +methanol was selected as the solvent and Polysorb ate 80 as the solubilizer. This water-soluble preparation of emamectin benz oate prevented the wilting of pot-grown 4-year-old trees of the Japanese bl ack pine, Pinus thunbergii, artificially inoculated with the pine wood nema tode, Bursaphelenchus xylophilus, at a dose of 20 g emamectin benzoate per cubic metre of pine tree. (C) 2001 Society of Chemical Industry.