Anais da Sociedade Entomológica do Brasil (2000) 29, 361-366

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J.J. Carbonari, J.F.S. da Martins, J.D. Vendramim and M. Botton (2000)
Relação entre Flutuação Populacional de Oryzophagus oryzae (Costa Lirna) (Coleoptera: Curculionidae) e Período de Perfilhamento de Cultivares de Arroz Irrigado
[Relationship between populational fluctuation of Oryzophagus oryzae (Costa Lima) (Coleoptera: Curculionidae) and the tillering period of irrigated rice cultivars]
Anais da Sociedade Entomológica do Brasil 29 (2), 361-366
Abstract: The synchronism between infestation period of Oryzophagus oryzae (Costa Lima) larvae and tillering period, was evaluated in four cultivars of irrigated rice (Bluebelle, BR-IRGA 410, BR-IRGA 414 and Dawn), which differ on degree of resistance to the insect and the duration of its development cycle. The experiments were carried out in the field, during 1994 and 1995 rice seasons. The number of larvae and tillers were registered weekly from 10 to 85 days after rice plants inundation (DAI). The first larvae were found 10 DAI, while the peak of larval population occurred 31 DAI, regardless of the cultivars. The cultivars BR-IRGA 414 and Bluebelle (early cycle) produced tillers up to 45 DAI, while the cultivars BR-IRGA 410 and Dawn (medium cycle) produced tillers up to 68 DAI. The tillering period of early and semi-early cultivars lasted respectively 14 and 37 days, after the populational peak of larvae occurred. Medium cycle cultivars have shown higher capacity of recovering damaged roots after larval attack, thus becoming potentially more tolerant to insect damage.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): José Djair Vendramim

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

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Oryzophagus oryzae Rice (Oryza)