Evaluating the damage of Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) on some cultivars of tomato under greenhouse condition.
Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) is the major pest of tomato plant. Since using relatively resistant cultivars may reduce the number of sprayings as well as postpone the development of the resistance to pesticides, the present study focused on evaluating the damage of T. absoluta on eleven 45-day-old tomato cultivars under greenhouse condition. Larval mines on the leaves as well as the terminal bud damage were considered. Damaged leaves, active mines and damaged terminal buds were significantly different among the cultivars. Cluster analysis using SPSS software resulted in grouping the cultivars into four categories as relatively resistant, partially resistant, partially susceptible and susceptible. The host plant's growing characteristics (height and leaflet number) were assessed and likewise the weight of the resulted pupae. Differences in vulnerability of the cultivars showed that tomato cultivars possess resistant traits and the identification and utilisation of these traits can give rise to resistant varieties.