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Exp Appl Acarol

Title:		Evaluation of airborne methyl salicylate for improved conservation biological control of two-spotted spider mite and hop aphid in Oregon hop yards
Author(s):		Woods JL; James DG; Lee JC; Gent DH;
Address:		"Department of Crop and Soil Science, Oregon State University, 109 Crop Science Building, Corvallis, OR 97331-3002, USA"
Journal Title:		Exp Appl Acarol
Year:		2011
Volume:		20111022
Issue:		4
Page Number:		401 - 416
DOI:		10.1007/s10493-011-9495-8
ISSN/ISBN:		1572-9702 (Electronic) 0168-8162 (Linking)
Abstract:		"The use of synthetic herbivore-induced plant volatiles (HIPV) to attract natural enemies has received interest as a tool to enhance conservation biological control (CBC). Methyl salicylate (MeSA) is a HIPV that is attractive to several key predators of two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), and hop aphid, Phorodon humuli (Schrank) (Homoptera: Aphididae). A 2-year study was conducted to evaluate the recommended commercial use of MeSA in hop yards in Oregon. Slow-release MeSA dispensers were stapled to supporting poles in 0.5 ha plots and these plots were compared to a paired non-treated plot on each of three farms in 2008 and 2009. Across both years, there was a trend for reduced (range 40-91%) mean seasonal numbers of T. urticae in five of the six MeSA-baited plots. Stethorus spp., key spider mite predators, tended to be more numerous in MeSA-baited plots compared to control plots on a given farm. Mean seasonal densities of hop aphid and other natural enemies (e.g., Orius spp. and Anystis spp.) were similar between MeSA-treated and control plots. Variability among farms in suppression of two-spotted spider mites and attraction of Stethorus spp. suggests that the use of MeSA to enhance CBC of spider mites in commercial hop yards may be influenced by site-specific factors related to the agroecology of individual farms or seasonal effects that require further investigation. The current study also suggests that CBC of hop aphid with MeSA in this environment may be unsatisfactory"
Keywords:		Animals *Aphids Cannabaceae/*parasitology *Insect Control Oregon Salicylates/*administration & dosage *Tetranychidae;
Notes:		"MedlineWoods, J L James, D G Lee, J C Gent, D H eng Evaluation Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Netherlands 2011/10/25 Exp Appl Acarol. 2011 Dec; 55(4):401-16. doi: 10.1007/s10493-011-9495-8. Epub 2011 Oct 22"