Study on Population Fluctuation of Thrips tabaci (L.) on Cluster Cultivars in Ultra Narrow System in the Field’s Cotton Golestan Province of Iran

Abstract

In the planting system, very narrow row spacing with spacing of rows between 20 and 40 cm is considered. This planting method increases production. Experiments to study and compare the population thrips on 3 cluster variety and one check cultivar, using the method of narrow planting distance of 20 × 20 and 20 × 80 cm in the form of factorial design in the form of a randomized complete block design with 3 replications in Hashemabad cotton research station in Gorgan during the two years 2018-2019 was evaluated. Statistics of different stages of the thrips pest it was recorded weekly in the tested treatments and recorded in special tables. Based on studies the results of combined analysis of variance show that the yield in the cultivars tested in Sajedi® cultivar with a distance of 80 cm with an average yield of 1696 gr in the plot and Golestan® cultivar 80 cm with 1622.9 gr in the plot with the highest yield and T2® cultivar with a distance of 20 cm, 847.2 gr in plot had the lowest yield. Infestation rate of cluster cultivars tested in very narrow cultivation thrips population density in Golestan® cultivars with a distance of 80 cm and Sajedi® with a distance of 20 cm, 1.723 thrips per leaf with the most infestation and Golestan® cultivar with a distance of 20 cm, 1.388 thrips least infestation was measured in leaves. Therefore Golestan® cultivar with an average yield and thrips population infestation, the lowest cotton cultivation in agriculture ultra-narrow row 20 centimeters had in the cotton fields.