The efficacy of some insecticides to control onion thrips, Thrips tabaci Lindeman (Thy.: Thripidae), in Azarbaijan-e-Sharghi province
Subject Areas :
Keywords: insecticide, onion, Efficacy, Thrips, Azarbaijan-e-Sharghi,
Abstract :
In order to investigate the efficacy of some insecticides and grading for the most effective one against onion thrips, an experiment was carried out in randomized complete block design with 7 treatments along with a control in 4 replications during years of 2006-2007. Treatments were including: Imidacloprid (Confidor SC 350, 0.5 Lit/ha), fipronil (Regent G 2, 20 Kg/ha), spinosad (Tracer SC 240, 50 gr AI/ha), thiodicarb (Larvin DF 80, 1.5 Kg/ha), imidacloprid (Confidor SC 350, 0.5 Lit/ha as soil application), deltametrin (Decis EC 2.5, 0.3 Lit/ha), oxymatrin (Kingbo SL 6, 1 Lit/ha) and the control (water). Number of spraying was 2 times in each year, and in each time, one day before and 10 days after spraying 5 onion plants were sampled randomly. Then the numbers of live thrips (adults and nymphs) were recorded. In addition to the percentages of mortality caused by the insecticides, yield and size of bulbs in different treatments were recorded and analyzed statistically. The results showed that imidacloprid (as soil application) with %86 mortality, had the highest effect on onion thrips population. This was followed by spinosad and imidacloprid (as spraying). Fipronil had the least efficiency on the pest. Imidacloprid (as soil application), thiodicarb, oxymatrin and imidacloprid (as spraying) treatments resulted the highest yield of onion. The smallest amount of the yield was obtained in fipronil. The highest size of onion (65 millimeter) was in the imidacloprid (as soil application), 0xymatrin and imidacloprid (as spraying). The least of onion size was observed in fipronil that showed no significant difference with other treatments except imidacloprid (as soil application).
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