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Gaucher's disease;thirty-two years experience at Siriraj Hospital
A study of Macrobathra Meyrick from China (Lepidoptera, Cosmopterigidae)
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Factors acting on Bemisia tabaci Genn B biotype Hemiptera Aleyrodidae oviposition in tomato Fatores que Afetam a Oviposicao de Bemisia tabaci Genn Biotipo B Hemiptera Aleyrodidae em Tomateiro


Factors acting on Bemisia tabaci Genn B biotype Hemiptera Aleyrodidae oviposition in tomato Fatores que Afetam a Oviposicao de Bemisia tabaci Genn Biotipo B Hemiptera Aleyrodidae em Tomateiro



Neotropical Entomology. October-December; 314: 631-634



The aim of the present work was to determine the oviposition preference of the silverleaf whitefly on tomato (Lycopersicon esculentum). Preferred plant age and leaflet position on the plant were studied and the number of adults per plant necessary for selecting hosts was determined. Bruna VFN hybrid plants at different ages (30-, 45- and 60-days old) were offered to adult whiteflies in free choice test and 30-day old plants in no-choice test. Leaves were collected from upper and lower part of the plant; the leaflets were divided into three categories: basis (those near the steam of plant), middle and apex (terminal leaflet). The 30-day old plants were more preferred for oviposition in free choice test. In the upper part of the plant, whitefly adults preferred to oviposit on the leaflets at the apex and the middle of the leaves. However, in the lower part of the plant, the basal leaflets were preferred in relation to middle and apex. The densities of 100 or 150 adults per tomato plant were considered adequate for genotypes screening, using no-choice test.

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