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Development and preventative effect against pine wilt disease of a novel liquid formulation of emamectin benzoate

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Injection of the poorly water-soluble emamectin benzoate (EB) into pine trunks required the development of an efficient liquid formulation. For injection into big trees in forests a good rate of injection and a high active content were required. Tests on the viscosity and EB-solubilizing ability of 14 various solubilizers in diethylene glycol monobutyl ether (DGMBE) led to the selection of Sorpol SM-100PM as the solubilizer of the formulation. Relationships between the solubilizing ability and amounts of Sorpol SM-100PM and DGMBE relative to that of EB, and between the concentration of the latter and the viscosity or the injection rate of the formulation led to a novel 40 g litre-1 emamectin benzoate formulation (Shot Wan Liquid Formulation), which was composed of EB (40), Sorpol SM-100PM (120), DGMBE (160) and distilled water (50 g litre-1) in methanol. Injection of this formulation at a dose of 10 g EB per unit volume of pine tree prevented over 90% of the trees from wilting caused by pine wood nematode, and this preventative effect continued for 3 years. Neither discolouration of the leaves nor injury around the injection hole on the trees was observed after injection of the formulation.

© 2003 Society of Chemical Industry
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Keywords: Bursaphelenchus xylophilus; emamectin benzoate; pine wilt disease; preventative effect; solubilizer; trunk injection agent

Document Type: Research Article

Affiliations: 1: * 2: Laboratory of Bioresources Chemistry, Faculty of Agriculture, Okayama University, Okayama 700-8530, Japan

Publication date: 2003-03-01

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