Optimum timing of insecticide applications against diamondback mothPlutella xylostella in cole crops using threshold catches in sex pheromone traps

Abstract

Field trials were conducted in cabbage (Brassica oleracea var capitata), cauliflower (B oleracea var botrytis) and knol khol (B oleracea gongylodes) crops at two different locations in Karnataka State (India) to optimize the timing of insecticide applications to control the diamondback moth, Plutella xylostella, using sex pheromone traps. Our results indicate that applications of cartap hydrochloride as insecticide during a 12-24 h period after the pheromone traps had caught on average 8, 12 and 16 males per trap per night in cabbage, cauliflower and knol khol, respectively, were significantly more effective than regular insecticide sprays at 7, 9, 12 or 15 days after transplantation. This was demonstrated by estimation of the mean number of eggs and larvae per plant, the percentage of holes produced, as well as the marketable yield of the three crops at each location. A good correlation between the immature stages, infestation level, the estimated crop yield and the number of moths caught in pheromone traps was also found, indicating the usefulness of pheromone-based monitoring traps to predict population densities of the pest.

Biorational insecticides in pest management

“…100) Although in the vast majority of cases a good correlation between catches and level of damage has been noticed, [101][102][103] sometimes the number of adults caught in traps was not correlated with the number of eggs laid and larvae found in plants. 104,105) In order to get a good prediction of the damage caused by the larvae of the next generation, several features should be considered.…”

Trap effect on the capture of Plutella xylostella (Lepidoptera: Plutellidae) with sex pheromone lures in cabbage fields in Vietnam

“…The pheromone activity of the two components was improved by adding 1% of (Z)-11-hexadecenol (Z11-16: OH) (Koshihara and Yamada, 1980), and further enhanced by adding 0.01% of (Z)-11-tetradecenyl acetate (Chisholm et al, 1983;Deng and Du, 2002). DBM synthetic sex pheromone has been tested efficiently for monitoring (Baker et al, 1982;Shirai and Nakamura, 1995;Ronald, 1997;Reddy and Guerrero, 2001), mass trapping (Chisholm et al, 1979;Reddy and Urs, 1997;Reddy and Guerrero, 2000) and mating disruption (Fujiyoshi et al, 1979;Mclaughlin et al, 1994). In China, Liu et al (1984) synthesized the DBM sex pheromone components and tested the activities of lures with different ratios and loadings of components in fields (Liu et al, 1985(Liu et al, , 1987a.…”

Selectividad Del Insecticida Cartap Empleando Bioensayos Con Organismos No Destinatarios

“…La avispita T. bactrae, ha sido introducida de los campos algodoneros de Australia al Perú, y ataca al gusano rosado del algodón Pectinophora gossypiella (Saunders, 1844) (Gelechiidae) en la costa peruana, así como una gran variedad de huevos de insectos perjudiciales, especialmente microlepidóptera de la familia Gelechiidae, Pyralidae, Olethreutidae y Noctuidae, en los cultivos de arroz, algodón, caña de azúcar, frutales, hortalizas y maíz (Malik, 2001 a b). Estos parasitoides son de fácil reproducción y son una herramienta en el control biológico de plagas (Reddy & Guerrero, 2001). …”

“…El cartap es un plaguicida carbámico usado a nivel mundial en el control de plagas agrícolas como la polilla minadora del tomate Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) (Bezerril et al, 1992;Picanço et al, 1998;Reis & Souza, 1998), la polilla minadora de los cítricos Phyllocnistis citrella Stainton, 1856 (Lepidoptera: Gracillariidae) (Rae et al, 1996), la polilla de la col Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) (Reddy & Guerrero, 2001;Mohan & Gujar, 2003;Ninsin, 2004) y la polilla de la papa Phthorimaea operculella (Zeller, 1873) (Lepidoptera: Gelechiidae) . Además se ha utilizado como molusquicida sobre el gasterópodo dulceacuícola Oncomelania hupensis Gredler, 1881 para el control del hospedero intermediario de Schistosoma japonicum (Katsurada, 1904) (Digenea: Schistosomatidae) (Xia et al, 1992).…”