Formulación de un nucleopoliedrovirus con Spinosad para el control de Spodoptera frugiperda en el maíz

Spinosad™ (Dow AgroSciences) Is a neurotoxin mixture produced during fermentation of a soil actinomycete, and has high activity towards Lepidoptera. Diet surface contamination bioassays were performed with Spodoptera frugiperda multiple nucleopolyhedrovirus (SfMNPV) and Spinosad alone and in mixtures. The interaction of SfMPNV + Spinosad mixtures In S. frugiperda larvae was generally independent or slightly antagonistic In nature, although weak synergism was detected In mixtures containing 3 ppm Spinosad + 20 or 70 occlusion bodies/mm2 diet of SfMNPV. Virus concentration did not significantly affect the mean time to death, either alone or when mixed with Spinosad, whereas Increasing the concentration of Spinosad caused a highly significant decrease In the mean time to death of larvae. Threshold tolerance analysis was employed to generate time-response curves that showed two clear phases; an initial response to Spinosad until ~100 h followed by virus-induced mortality at 120 - 250 h postinoculation. A field trail was performed to assess the degree of pest control achieved by SfMNPV-Splnosad mixtures applied to maize. Recovery of S. frugiperda larvae was significantly reduced in all treatments compared to recovery from control plots. The mixture of SfMNPV with 3 ppm / Spinosad resulted In approximately 90% S. frugiperda control, which was 12.5 - 32% greater control than for plots treated with SfMNPV alone. The Impact of low concentrations of Spinosad on nontarget arthropods present in the maize crop was evaluated in a field trail. Application of 3 ppm Spinosad had very little effect on the abundance of Insect natural enemies present on maize plants, whereas the application of the product label recommended rate of 200 ppm Spinosad had effects similar to those obsen/ed following application of chlorpyrlfos. The use of low concentrations of Spinosad merits further study as a means of controlling lepidopteran pests either alone or in combination with other entomopathogens.

Bibliographic Details

Main Authors:	Méndez Alcudia, Walter Alberto autor 14122, Williams, Trevor Doctor tutor 5446, Ibarra, Jorge E. Doctor asesor 12530, Valle Mora, Javier Francisco Maestro asesor 10513
Format:	Texto biblioteca
Language:	eng
Published:	Tapachula, Chiapas, México El Colegio de la Frontera Sur 2001
Subjects:	Spodoptera frugiperda, Baculoviridae, Espinosad, Insecticidas de origen vegetal, Maíz, Control biológico de plagas,
Online Access:	https://ecosur.repositorioinstitucional.mx/jspui/handle/1017/1590
Tags:	Add Tag No Tags, Be the first to tag this record!