میزان آلودگی ژنوتیپ های چغندر قند به لارو بید چغندر قند Scrobipalpa ocellatella

The sugar beet moth, Scrobipalpa ocellatella (Boyd) (Lepidoptera: Gelechiidae) is one of the most serious threats to sugar beet production worldwide. This insect is more prevalent in tropical and subtropical regions and in regions where summer is very hot. In Iran, the sugar beet moth was collected by Afshar in 1936 from Karaj and Varamin at the first time, then studies were conducted in the field of the sugar beet moth biology and control. This moth, reduces the growth and as a result reduces the quantitative and qualitative yield of the product by laying the eggs on the back of the central leaves of sugar beet and entering the larvae into the central buds and finally the tuber. Larvae feeding from the side of young leaves causes leaf intorsion and they cause corruption and rotting of the central leaves when feed from the central bud, sometimes they burrow inside the petioles and feed on the end parts of the roots or crowns of sugar beet. Therefore, in this project, eight treatments (1 = Paternity 007; 2 = Rosier; 3 = SBSI 034; 4 = 7K43; 5 = Dorothy; 6 = Ekbatan; 7 = SBSI 019 and 8 = SBSI016 (Permanent); which had different characteristics of botanical indicators including the color and arrangement of leaves, were selected and the pest damages were evaluated and compared with non-parametric evaluation. The experiment was conducted in a completely randomized block design with four replications. The results showed that the number of larvae on different treatments was not statistically difference. However, there was a significant difference in the percentage of plant infections in different treatments. For example the Predicted 007 line with 52.52 ± 5.54 percent infected and in the four varieties including 7K43 (68.42 ± 5.45), Ekbatan (67.99 ± 5.44), SBSI 019 (=69.63 ± 6.25) and SBSI016 (= 66.46 ± 5.11) had the highest rate of infection.