부산대학교 도서관

Background: Yield of pigeon pea, besides other management practices, highly relies on variety and pollinators. Again, different insecticides are also known to immensely influence the abundance of these pollinators. Hence, the current study was conducted with objectives to record diversity of flower visitors and abundance of insect pollinators, to work out pollination efficiency of major pollinators and to evaluate the effect of different varieties and insecticidal treatments on the pollinator behaviour, yield and yield attributes of pigeon pea in order to reduce the ecological impact of chemicals as well as to increase the productivity of pigeon pea. Methods: The experiment was designed in a Split plot arrangement replicated thrice. The varieties were assigned in main plots and had four levels such as UPAS-120, PA-406, PA-421 and PA-441. Types of insecticides applied were taken in the sub plots and it also had four levels viz. Quinalphos 25 EC (325 g a.i./ha), Lufenuron 5.4 EC (30 g a.i./ha), Deltamethrin 2.8 EC (12.5 g a.i./ha) and Indoxacarb 15.8 EC (50 g a.i./ha). Result: Outcomes emanated from the study revealed that Megachile disjuncta, Xylocopa latipes and Megachile bicolor were the three most important pollinator bee species on kharif pigeon pea in the tarai region of Uttarakhand. Among the varieties, UPAS-120 and PA-441 had better cross pollination potential over the PA-406 and PA-421. Insecticides had overall negative impact on the insect pollinators. However, Deltamethrin 2.8 EC at recommended dose was found to have least impact on the insect pollinators. Quinalphos 25 EC and Lufenuron 5.4 EC were observed to be more deleterious on pollinators. The ultimate impact on the pollinator insects were profound on the yield and yield attributes of pigeon pea. [ABSTRACT FROM AUTHOR]