Bragantia (2009) 68, 1025-1035

Sérgio Alexandre Mottola Pereira Coelho, André Luiz Lourenção, Arlete Marchi Tavares de Melo and Eliana Aparecida Schammass (2009)
Resistência de meloeiro a Bemisia tabaci biótipo B
[Resistance of melon to Bemisia tabaci biotype B]
Bragantia 68 (4), 1025-1035
Abstract: Silverleaf whitefly B. tabaci biotype B is an important worldwide pest of many crops. Use of resistant cultivars is considered the ideal method of control. In this research, 32 cultivars of melon were evaluated under greenhouse conditions reganding resistance to silverleaf whitefly. As to adult attractiveness, 'Neve' had the lowest number of adults on the abaxial surfaces of leaves (0.6 adult/10cm²) while 'Nilo' was the more attractive (5.6 adults/10cm²). The oviposition preference was evaluated in free-choice and no-choice tests. In both, 'Neve' was less oviposited and 'Nilo' had the highest number of eggs. The silverleaf whitefly colonization was evaluated by scores varying from 0 (no colonization) to 6 (leaves completely colonized). While 'Neve' showed the lowest level of colonization, high levels were observed in 'Imperial', 'Jangada', 'Vereda', 'Deneb' and 'Nilo'. The B. tabaci biotype B egg-adult cycle varied from 24.0 ('Neve') to 25.4 days ('Jangada'), without any significant differences among the genotypes. The lowest rates of adult emergence were observed in 'Vereda' (68.2%) and 'Nilo' (69.3%), suggesting that antibiosis is the mechanism of resistance, while 'Imperial' (90.9%) and 'Deneb' (89.6%) presented the highest rates. Considering the evaluated characteristics, 'Neve' is the most resistant cultivar to silverleaf whitefly and should be tested in highly infested areas. Additionally, it might be a valuable source of resistance for breeding programs.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): André Luiz Lourencao

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Melon (Cucumis melo)