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Susceptibility evaluation of six onion varieties to thrips tabaci lindeman 1888 thysanoptera thripidae in early crop



Susceptibility evaluation of six onion varieties to thrips tabaci lindeman 1888 thysanoptera thripidae in early crop



Cientifica 15(1-2): 79-84



The present study was carried out in order to observe the resistance to thrips in six onion [Allium cepa] varieties: Baia do Cedo, Pira Ouro, Pira Tropical, Pira Lopes, Roxa Barreiro and Texa Grano. The evaluations on thrips population were made in 15 plants per plot. Final yield was also recorded. Texas Grano and Baia do Cedo were less preferred and more productive, the first being superior. The other varieties were similar as to infestation, showing high susceptibility to the insect concerned, which resulted in lowered yield due to decreasing in numbers and average weight of commercial bulbs. The variety Pira Lopes showed once a good potential although showing a high susceptibility; its yield was equivalent to that obtained by Texas Grano and Baia do Cedo.

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