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The resistance of 11 tomato cultivars (Ps-6515, Berlina, Poolad, Petoprid-5, Zaman, Matin, Golsar, Sandokan-F1, Golshan-616, Sadeen-95 and Sadeen-21) to the tomato moth, Tuta absoluta (Meyrick) (Lepidoptera:Gelechiidae) was investigated under field conditions. A randomized complete block design was used with three replications. Data analysis indicated that there were significant differences (P < 0.05) among cultivars regarding leaflet damage, leaf damage, overall plant damage, number of mines per leaf, number of holes on the stem, and fruit. Our findings revealed that the cultivars Berlina, Golsar, Poolad, and Zaman were less suitable cultivars, suggesting that they are more resistant to the tomato moth than the other cultivars. The high density of leaf trichomes present in the cultivars Berlina, Zaman, and Golsar can be one of the possible causes of resistance to T. absoluta. Knowledge of the extent of susceptibility or resistance of cultivars to a pest on a crop is one of the fundamental components of integrated pest management (IPM) programs for any crop.

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The two-spotted spider mite (TSSM), Tetranychus urticae Koch is one of the most important pests of peach trees in Iran. The reproduction, survival, and life table parameters of TSSM on three peach cultivars: Redtap, G.H.Hale and Kardi, were studied at 27 ± 1°C, 50 ± 10 % RH and a photoperiod of 12L:12D. The average developmental time from egg to female adult on the cultivars was 10.3 ± 0.303, 9.431 ± 0.176 and 9.9 ± 0.166, respectively. Intrinsic rates of increase (rm) were 0.07 ± 0.02, 0.21 ± 0.01 and 0.18 ± 0.008, respectively. Based on some biological and demographic parameters of T. urticae on the different peach varieties, along with the significant differences between Redtap and the other 2 varieties, it was concluded that the Redtap variety is not as suitable a host as the other two varieties.