Investigation on the Efficacy of Chemical Control of Elm Leaf Beetle, Xanthogaleruca luteola Mull. by Trunk Injection
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Article Type:
Research/Original Article (بدون رتبه معتبر)
Abstract:
Elm Leaf Beetle (ELB), Xanthogaleruca luteola (Coleoptera: Chrysomelidae) is one of the important pests of elm trees (Ulmus spp.). This experiment was performed in order to evaluate two chemical control methods of this pest on the elm trees in the 22nd district of Tehran in 2014. The experiment was designed in a randomized complete block with four replications and 13 treatments. Treatments included injection of imidacloprid SC35% (with doses of 6, 12 and 18 g/ tree), oxydemeton-methyl EC 25% (with doses of 6, 12 g formulated/tree), azadirachtin EC 0.03 % (with doses of 6, 12 g formulated/tree), hexaflumuron EC 10% ( with doses of 6, 12 g formulated/tree), fenoxycarb and lufenuron ( Lufox® EC10.5%; with doses of 6, 12 g formulated/tree), control (water injection) and foliage application with diazinon EC60% with concentration of 2ml formulated/L as a conventional control method. Sampling was conducted 14 times until the end of the summer season. Results show that the mean efficacies of imidacloprid (83%) and Lufox® (91%) at high concentrations were the same as diazinon treatment (84.25%) and all of them were ranked in one group. Mean efficacies of azadirachtin (51%), hexaflumuron (33%), and oxydemeton-methyl (23%) injections were significantly less in comparison with the mentioned treatments. Mean damage percentage on sampled leaves and apparent color of the tree crown showed that the trees treated with Lufox® and imidaclopride had the least damage percentage (25.3%), while the control (55%) and azadirachtin (65%) had the highest percentage. Therefore, injection method of imidacloprid and lufox against elm leaf beetle could be applied in the central parts of the cities or places with high risks of contamination and where the tree crown is very high.
Language:
Persian
Published:
Journal of Pesticide in Plant Protection Sciences, Volume:5 Issue: 1, 2019
Pages:
32 to 42
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