نوع مقاله : مقاله پژوهشی
نویسنده
موسسه تحقیقات گیاهپزشکی کشور، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
In recent years, the population of cereal leaf beetle, Oulema melanopus, have increased in some regions of Iran. Therefore, it is essential to evaluate the population dynamics of this pest and the impact of insecticides on it and the natural enemies in wheat fields. In this study, the population of O. melanopus and some natural enemies including seven-spotted ladybird and flower fly larvae were examined in Tehran province, and also the effects of three recommended insecticides were evaluated. The results showed from the last week of April to the first week of May, there were about 2 larvae of O. melanopus per stem, with the highest number 2.4 larvae/stem observed on May 1 followed by a decline, reaching 0.5 larvae/stem by May 8. Three days after treatment with deltamethrin (0.3 ml/L), fenitrothion (1 ml/L), matrine (2 ml/L), and matrine (1.5 ml/L), the number of larvae/stem was 0.4, 0.85, 0.52, and 0.47, respectively, while untreated conditions had 2.12 larvae/stem. The population of ladybird larvae decreased under spraying conditions; however, two weeks after treatment, the population in the matrine treatment returned to levels observed in untreated plots, while in the deltamethrin and fenitrothion treatments, ladybird larvae populations were 50% lower than those in untreated plots. The flower fly larvae population remained very low during the pesticide application. Based on the results, it is recommended that field monitoring in Tehran province be conducted from mid-April to mid-May in Tehran province, with chemical control of the cereal leaf beetle using low-risk insecticides, if necessary.
کلیدواژهها [English]
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