Field evaluation of three species of Trichogramma against the striped rice stem borer
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Rice, commonly known as Oryza sativa, is one of the most important crop plants in Asia continent and a broad range of pests in the most parts of the world inflict damage to this product at different stages. The striped rice-stem borer, Chilo suppressalis (Walker) is as one of the most important spices of rice pest in Iran. The best way of the successful and sustainable control of the most pests is the use of biological control and pesticides in the framework of the integrated pest management program. Trichogramma is one of the most important and effective natural enemies among natural enemies of rice stem borer. In this study, the effectiveness of three species of Trichogramma (Trichogramma brassicae, T. embryophagum and T. pintoi) and Diazinon insecticide is evaluated in the field conditions. To this end, a field experiment is conducted in the rice field in a randomized complete block design in the Gol Chub village of Babol city in two consecutive years (1394 and 1395). The results of the study show that the highest rate of parasitism (1.80 ± 67.53) is related to T.brassicae and the least rate of parasitism (4.99 ± 44.69) is related to T. pintoi in the released plots.Totalparasitism percent in the second yearT.pintoi(34.25±1.44) ،T.brassicae(42.75±2.93) and T.embryophagum(38.75±1.49). Also, the lowest percentage of infection (white heads) in the second generation is related to the diazinon insecticides with 1.20 ± 0.14 in the first year, 0.07± 1.34in the second year and then the T. brassicae with 1.40± 025 in the first year, 1.53± 0.06 in the second year .The two insecticide diazinon and T. brassicae treatment had the best performance among the calculated performance of paddy. According to the results of this study T. brassicae can be introduced as an appropriate biological control agent for pest control of stem borer that it can be compatible with conventional insecticides in the rice stem borer control (diazinon).
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