Comparitive Effects of Abamectin, Sulfur wp., Volk oil and Detergent on Colomerus vitis Pagenstecher (Acari: Eriophyidae) in Vineyards of Urmia

Grape erineum mite (GEM) Colomerus vitis (Pagenstecher), is one of the major pests of grapevine which directly and indirectly influences the quality and quantity of grape annually. Hence to reduce and control the leaf infestation, a research was conducted in a completely randomized block design in an experimental vineyard in Urmia city, West-Azerbaijan province, Iran during 2016 to 2017 with 10 treatments including abamectin, volk oil, detergent, abamectin+ volk oil+ detergent, abamectin+ volk oil, abamectin+ detergent, volk oil+ detergent, sulfur 3.5 and 4.5% wp., water (testifier) with 70 replicates. Abamectin (0/5 l/1000 l of water, 1.8% EC), volk oil (2.5 l/100 l of water, 80% L), detergent (0.5 l/1000 l of water) and sulfur (3.5 and 4.5%) applied with the mentioned concentrations. Spraying operation organized in three and sampling in seven times with biweekly intervals. Percentage of efficiency, calculated with Henderson-Tilton formula then corrected with GLM. According to results, all treatments including abamectin in first spraying stage (late winter) showed ≥ 90% efficacy whereas; other treatments without abamectin like volk oil and detergent in first spraying stage showed 57-91 and 55-88% mortality, respectively. Sulfur 3.5 and 4.5% wp. in both second and third spraying stages by 48-69 and 51-65%, respectively controlled the GEM less than abamectin. To control this pest around economic threshold and also less adverse impacts to the nature, applying volk oil (2.5 l/100 l of water) with detergent (0.5 l/1000 l of water) in late winter is advisable.