بررسی اثر حشره کش های جدید روی تریپس پیاز ‭Thrips tabaci ‬در مزارع سیر

Onion thrips is one of important pests of onion, garlic and other Allium species that various insecticides are used to its control in Iran and the world. Here, we compared efficiency of 7 new or current insecticides, as following: 1. Imidachlopride (Confidor) SC 350, 0.5 lit/ha 2. Regent (Fibronil) G 0.2%, 60 k/ha 3. Spinosad (Tracer) (bioinsecticide), 50 g-ai/ha 4. Diazinon (Trade formulation), 1.5 lit/ha (recommended by Plant Protection Organization) 5. Imidachlopride SC350, 500 ppm concentration, 100 cc/plant by irrigation 6. Deltametrin (Decis) EC 2.5, 300 cc/ha 7. Kingbo SL 6%, 1 lit/ha 8. Control (water) Garlic was planted in 3*3 plots on farm of Agriculture and Natural Resources Research Center of Tehran Province on early November in 2007 and 2008. The trial was conducted as Randomized Complete Blocks Design with 8 treats and 4 blocks (replicates). Sprays were done when thrips population reached over 100 per plant at 15 and 21 May in 2008 and 2009 respectively. Sampling were done in 1 day before and 5, 10, 20 days after spraying by entering whole sampled plant into plastic pocket and 3 rough bits. 5 samples were taken from each plot in each sampling date and then nymphs and adults of thrips counted in laboratory. Results showed that, treats 6 and 5 had more effects than the others, and the first had prolonged effect than the second. Treats 7 and 2 had lesser but prolonged effects than the two first respectively. Treat 3 was effective only in wet condition. The two other treats were less effective and not recommended. Key Word : Thrips tabaci, Garlic, Chemical Control