Appraisal of Different Tomato Genotypes against Scirtothrips dorsalis (Thysanoptera: Thripidae) Infestation with Reference to Morphological Plant Characters
Appraisal of Different Tomato Genotypes against Scirtothrips dorsalis (Thysanoptera: Thripidae) Infestation with Reference to Morphological Plant Characters
Amjad Usman1*, Arshad Khan1, Ruidar Ali Shah2 and Toheed Iqbal3
ABSTRACT
Scirtothrips dorsalis is a devastating pest of tomato. The objective of this study was to screen commercially available tomato genotype and to identify the morphological plant characters responsible for resistance against S. dorsalis. For this purpose, five commercially cultivated tomato genotypes (Riogrande, Riogrande H, Bombino, Roma VF and Roma) were evaluated against thrips (S. dorsalis) at A.R.I. Tarnab, Peshawar, Pakistan during spring 2017 in randomized complete block design with three replications. Trichome study was also carried out to know the type of trichomes responsible for resistance. Results revealed that genotypes differed significantly in response to S. dorsalis populations. S. dorsalis infestation started on April 3rd and peak population (11.73+0.55) was noted on May 1st on Bambino then population declined in the proceeding weeks, no S. dorsalis were recorded after June 22nd. In general, Roma supported lowest no. (4.16±0.23) of S. dorsalis plant-1 and Riogrande supported the highest (4.89±0.25) S. dorsalis plant -1 and were found comparatively resistant and susceptible respectively. There were more glandular trichomes than non-glandular trichomes on leaves. Among the glandular trichomes, Type IV was the most abundant followed by Type VI whereas Type I and VII were rarely found on the leaf of the tested genotypes. Among the non-glandular trichomes, Type V was most abundant compared to II, III VIII. RomaVF had higher trichome density (52.58±0.49 and 62.48±2.7 per mm2) followed Bambino (48.60±1.95 and 49.71±71 per mm2) and Roma (45.82±2.11 and 51.65±2.47 per mm2) on adaxial and abaxial leaf surfaces respectively. Negative relationship between S. dorsalis density with trichome density and type was observed in the tested tomato genotype. Morphological plant characters like glandular trichomes taking part in resistance against S. dorsalis can be used as an important tool in an integrated pest management model.
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