Anais da Sociedade Entomológica do Brasil (1997) 26, 145-152

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Ivan Cruz, Maria L.C. Figueiredo, Fernando H. Valicente and Antônio C. Oliveira (1997)
Application rate trials with a nuclear polyhedrosis virus to control Spodoptera frugiperda (Smith) on maize
Anais da Sociedade Entomológica do Brasil 26 (1), 145-152
Abstract: Different concentrations of nuclear polyhedrosis virus were applied as aqueous suspensions using a tractor mounted or a backpack-manual sprayer to control Spodoptera frugiperda (Smith) larvae on maize (Zea mays L.). Larval mortality varied with the application equipment. For the tractor-mounted sprayer application of at least 2.5 x 1012 PI.B./ha was necessary to attain a control comparable to that obtained with the backpack-manual sprayer application (70.2%). For this application method a dosage of 2.5 x 1011 P.I.B./ ha can be used, but NPV persistence was very short. A greater NPV persistence was obtained with doses over 1.25 x 1012 P.I.B./ha (93.4% mortality). The occurrence of parasitoids in the experimental area increased larval mortality rate (16.4%), independent of the application method. Among the parasitoids, the most prevalent was Campoletis flavicincta (Ashmead) (53.0%), followed by Chelonus insularis (Cresson) (31.3%), and Eiphosoma spp. (15.6%).
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Database assignments for author(s): Fernando H. Valicente, Ivan Cruz

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:

Pest and/or beneficial records:

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

Spodoptera frugiperda Maize/corn (Zea mays) Brazil (south)
Chelonus insularis (parasitoid) Spodoptera frugiperda Brazil (south)
Campoletis flavicincta (parasitoid) Spodoptera frugiperda Maize/corn (Zea mays) Brazil (south)