Study on the resistance components in potato, tomato, eggplant and pepper against Colorado potato beetle, Leptinotarsa decemlineata (Col.: Chrysomelidae) in field in Naghadeh region, west Azarbaijan province

Colorado potato beetle, Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae), is the most important defoliating pest of potato worldwide and is one of the dangerous pests of other solanaceous crops such as eggplant and tomato in many areas of the world. To evaluate the resistance in potato, tomato, eggplant and pepper to the pest, a field experiment was conducted. In a field choice test, the numbers of attracted beetles to the species were determined as antixenosis index. To evaluate the antibiosis, studied species were planted in pots and on each pot sleeve cages were set up, in which 15 first instar larvae were released and reared. Larval weight on the 10th day after releasing, mortality percentages of larvae and pupae and durations for these stages were considered and analyzed as the antibiosis indices. To study the tolerance of species, infested and non-infested plots were isolated and arranged based on a randomized complete block design in field. In infested plots, each plant was infested by 25 second and early third instars larvae. Chemical and mechanical methods were used for controlling of non-infested plots. At the end of the season, defoliation and yield loss in infested plots were determined and compared with non-infested plots. Analysis of variance of choice test data showed that significant difference was observed between experimental species (P