dinâmica populacional de bemisia tabaci biótipo b em tomate monocultivo e consorciado com coentro sob cultivo orgânico e convencional population dynamic of benisua tabaci b biotype in monoculture tomato crop and consortium with coriander in organic and conventional crop system
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Abstract
Due to its high genotypic plasticity, the control of the silverleaf whitefly Bemisia tabaci B biotype (Hemiptera: Aleyrodidae), is difficult. This insect may cause severe damage to the tomato crop as a vector of several viruses. The management of the production system and the consortium with other crops may have a direct effect on this herbivore population, without the need of chemical insecticide spraying. The effect of organic and conventional production systems and the tomato-coriander consortium were evaluated in this study, in field, during May-September 2006. Adults of whitefly and its natural enemies were monitored using yellow adhesive traps installed at the edge and inside the experimental plots, and nymphs were sampled by direct observation on tomato plants. Although adult populations in the neighborhood of the different treatments were equivalent, the abundance of whitefly adults was significantly lower in the plots with the consortium tomato-coriander in both systems, conventional and organic. Significant reduction in the amount of nymphs per plant was only observed in the consortium tomato-coriander when all treatments were compared. There were more natural enemies in organic system and a negative correlation was observed between natural enemies abundance collected in the traps and whitefly nymphs' density. The association tomato-coriander and the organic management of the agroecossystem favored natural biological control of B. tabaci.
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togni2009horticulturadinmica
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| Authors | ;Pedro HB Togni;Marina R Frizzas;Maria A de Medeiros;Erich YT Nakasu;Carmem SS Pires;Edison R Sujii |
| Journal | research on biomedical engineering |
| Year | 2009 |
| DOI |
10.1590/S0102-05362009000200011
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