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Abstract : |
Sixty seven cultivars/accessions from different species of Lycopersicon including L. esculentum, L. pimpinellifolium, L. peruvianum, L. parviflorum, L. hirsutum and L. pennellii were screened for resistance to Tetranychus urticae Koch using thumbtack and leaf disk bioassays. Results indicated that more number of mites remaining on the tack of L. hirsutum and L. pennellii accessions compare to the other accessions, whereas there was no significant difference among the remaining accessions/cultivars. The lowest level of oviposition rate and leaf damage score were observed in L. hirsutum and L. pennellii accessions. Among the other Lycopersicon cultivars/accessions, Punjab Chhaura (L. esculentum) supported the highest level of oviposition (158.6 eggs/10 females/3 days) and L. esculentum (TLB-193, Arka Meghali and LA 2302) displayed highest level of damage whereas L. esculentum NDTVR-73 supported the lowest level of oviposition (4.14 egg/female/3 days) and damage score. The accessions/ cultivars were classified into five groups, based on the overall performance in leaf disk and thumbtack bioassays. L. hirsutum (LA 1740, LA 1777 and LA 2860) and L. pennellii (LA 2963 and LA 2580) appeared to be highly resistant, while L. esculentum (TLB 193, LA2302, Arka alok, Punjab Chhaura) appeared to be highly susceptible to two-spotted spider mite., Sixty seven cultivars/accessions from different species of Lycopersicon including L. esculentum, L. pimpinellifolium, L. peruvianum, L. parviflorum, L. hirsutum and L. pennellii were screened for resistance to Tetranychus urticae Koch using thumbtack and leaf disk bioassays. Results indicated that more number of mites remaining on the tack of L. hirsutum and L. pennellii accessions compare to the other accessions, whereas there was no significant difference among the remaining accessions/cultivars. The lowest level of oviposition rate and leaf damage score were observed in L. hirsutum and L. pennellii accessions. Among the other Lycopersicon cultivars/accessions, Punjab Chhaura (L. esculentum) supported the highest level of oviposition (158.6 eggs/10 females/3 days) and L. esculentum (TLB-193, Arka Meghali and LA 2302) displayed highest level of damage whereas L. esculentum NDTVR-73 supported the lowest level of oviposition (4.14 egg/female/3 days) and damage score. The accessions/ cultivars were classified into five groups, based on the overall performance in leaf disk and thumbtack bioassays. L. hirsutum (LA 1740, LA 1777 and LA 2860) and L. pennellii (LA 2963 and LA 2580) appeared to be highly resistant, while L. esculentum (TLB 193, LA2302, Arka alok, Punjab Chhaura) appeared to be highly susceptible to two-spotted spider mite., |
