Data/hora: 11/06/2024 07:07:43

Provedor de dados: | Acta Agronómica
País: | Colombia
Título: | Efficacy of microencapsulated nucleopolyhedroviruses from Colombia as biological insecticides against Spodoptera frugiperda (Lepidoptera: Noctuidae)
Autores: | Barrera-Cubillos,Gloria Patricia; Gómez-Valderrama,Juliana Andrea; Rivero,Laura Fernanda Villamizar.
Data: | 2017-06-01
Ano: | 2017
Palavras-chave: | Microencapsulation; Baculovirus; Spodoptera frugiperda; Biological control; Maize.
Resumo: | Abstract: Wettable powder formulations by microencapsulation of viral occlusion bodies (OBs) of both Spodoptera frugiperda multiple nucleopolyhedrovirus from Colombia (SfCOL) and a genotypic variant (SfCOL-A) were evaluated for controlling the fall armyworm S. frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in maize crops. Microencapsulation preserved OBs activity after three months of storage at 35ºC, where insecticidal activity loss was not greater than 12%. Additionally, the formulation protected the OBs against inactivation caused by UV-B radiation, retaining its insecticidal activity after 6 hours of UV laboratory exposure, in contrast to unformulated viral suspensions, which presented an Original Activity Remaining (OAR) between 12.1 and 50%. Under greenhouse conditions, the insect mortality was greater than 80% with microencapsulated viruses. In field trials, treatments reduced the percentage of damaged plants to levels below the economic injury level (35%) when the formulated and unformulated virus were applied at 8x1011 OBs/ha (800g/ha) dose, while the damage in the control treatment was close to 60%. Microencapsulation of SfCOL and SfCOL-A OBs provides useful advantages related to half-life and photostability of both viruses, which showed the same efficacy under field conditions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200267
Editor: | Universidad Nacional de Colombia
Relação: | 10.15446/acag.v66n2.54354
Formato: | text/html
Fonte: | Acta Agronómica  v.66 n.2 2017
Fonte: | info:eu-repo/semantics/openAccess