ارزیابی لاین های امیدبخش دیپلوئید (بومی) نسبت به آفات و بیماری های مهم پنبه

In this research, 5 promising lines of diploid and native cotton, both hybrid and selected, and native varieties were selected in the form of randomized complete block design with 4 replications at Sabzevar Agricultural Research Station (Razavi Khorasan Province) during the years 1400-1401 accomplished. The studied treatments are: two strains of KD-9211, KD-9217 and KD-9219 along with two controls including the native stand of Goze Red (Kashmar) and the native Sabzevar (Aria). The studied treatments were cultivated in four 6-meter lines with a planting pattern of 20 x 70. Vegetative and reproductive traits of plant height, number of bolls, weight of 30 bolls and yield along with boll-weevil and bollworm pests and diseases of seedling death and verticillium wilt were measured and analyzed with SAS 9.1 statistical software and averaged by Duncan's test. were evaluated. In order to investigate the density of bollworm pest, at the beginning of cotton budding, 10 to 15 random plants are selected in the experimental plot and marked by a marker. The number of bolls and the number of infected bolls with signs of larval feeding will be counted. In order to investigate the relative abundance of cotton boll-weevil pests in the marked plants, the bolls with signs of nutrition (black spots) were periodically counted and the number of spots was cumulatively counted (the number of black spots in total random plants in each plot) and is subtracted from the previously noted number. The number of pods that have fallen and have black marks on the plant and at the base of the plant are also counted as damage symptoms of this pest. Recording of the percentage of seedling growth and death was done during periods of 7,14,21 and 30 days after planting and at the end the percentage of green plants in each plot was counted. The severity of verticillium wilt disease was investigated four months after planting and the disease index was determined. Based on the average comparison, the lowest rate of seedling death was related to the KD-9211 line and the highest was related to the Arya native (control).The lowest index of verticillium wilt disease was related to Aria native and the highest was related to Goze Red (control). There was no significant difference in the resistance of the lines to each other against boll-weevil and other pests. In case of the KD-9211 plots, the lowest level of contamination was also observed with the larvae of the roundworm. KD-9211 line compared to other lines, in addition to the height of the plant, high number of bolls and relatively high yield, has shown the highest tolerance among other cultivars against bollworm infection.