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Evaluation of wild species and cultivars of peanut for resistance to the Enneothrips flavens Moulton

In Brazil, various pests are reported to infest peanut crop, being the thrips Enneothrips flavens the most important. Accesses of wild peanut species, anfidiploide and peanut cultivars were evaluated in field conditions at Pindorama, São Paulo State, at the agricultural year of 2007/2008. The experiment consisted of a complete ramdomized block design with 48 treatments and five replications. The material was sown in small bags under greenhouse conditions. Plantings were carried out in October/November 2007. Starting at 30 days after planting in the field, evaluations were done at 15-day intervals, in five closed leaves of each plant. The following data were obtained: presence or absence of thrips in each leaf; symptoms of thrips damage in recently opened leaves, based on a 1-5 scale where 1 = without damage, 2 = 1 to 25% of the leaf surface with damage (grooves and deformations), 3 = 26 to 50%, 4 = 51 to 75% and 5 = 76 to 100% of damage symptoms. The accesses with the least damages and insect presence were: VS 14957 (A. gregoryi), V13832 (A. stenosperma), V8979 (A. kuhlmannii), V9912 (A. kuhlmannii), V7639 (A. kuhlmannii) e VMiIrLbGv14309 (A. villosa). The most sensitive accesses were V12549 (A. hypogaea), Ac2562 (A. hypogaea) and the commercial A. hypogaea genotypes IAC Caiapó and IAC Runner 886.

Thripidae; Enneothrips flavens; host plant resistance; oilseeds


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