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

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%).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
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:
surveys/distribution/isolation

---

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)