Influência de gerações de Plutella xylostella (L.) (Lepidoptera: Plutellidae) e de radiação no desempenho de isolados de Bacillus thuringiensis Berliner

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Plutella xylostella (L.) (Lepidoptera: Plutellidae): táticas para o manejo integrado em brássicas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Bacillus thuringiensis: diversidade gênica, estrutura genética de populações e eficiência no controle de Plutella xylostella (L., 1758) (Lepidoptera: Plutellidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento de Plutella xylostella (Linnaeus, 1758) (Lepidoptera: Plutellidae) em Brassicaceae ao longo de gerações

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Toxicidade e efeitos subletais de toxinas Cry de Bacillus thuringiensis Berliner em diferentes populações de Plutella xylostella (L.) (Lepidoptera: Plutellidae) em laboratório

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Virulência de micro-organismos à Plutella xylostella (L.) (Lepidoptera: Plutellidae) e compatibilidade com inseticidas

Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV

Egg parasitoids of the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), from south-east Queensland

Field surveys of egg parasitoids of the diamondback moth, Plutella xylostella, were conducted at Redlands and Gatton, south-east Queensland. Eggs of P. xylostella were present all year round in both localities, and parasitized eggs were consistently found between late spring and early winter. Percent parasitism in the range 30-75% was recorded on many occasions, although rates less than 10% were more common. The major parasitoids included Trichogrammatoidea bactrae Nagaraja and Trichogramma pretiosum Riley. Laboratory evaluation showed that the T. pretiosum from Gatton has a high capacity to parasitize P. xylostella eggs under suitable conditions. This study represents the first record of egg parasitoids of P. xylostella from Australia.

Evaluation of the impact of natural enemies on Plutella xylostella L. (Lepidoptera: Yponomeutidae) populations on commercial Brassica farms

1 Accurate assessment of the impact of natural enemies on pest populations is fundamental to the design of robust integrated pest management programmes. In most situations, diseases, predators and parasitoids act contemporaneously on insect pest populations and the impact of individual natural enemies, or specific groups of natural enemies, is difficult to interpret. These problems are exacerbated in agro-ecosystems that are frequently disrupted by the application of insecticides. 2 A combination of life-table and natural enemy exclusion techniques was utilized to develop a method for the assessment of the impact of endemic natural enemies on Plutella xylostella populations on commercial Brassica farms. 3 At two of the experimental sites, natural enemies had no impact on P. xylostella survival, at two other sites, natural enemy impact was low but, at a fifth site, natural enemies drastically reduced the P. xylostella population. 4 The calculation of marginal death rates and associated k-values allowed the comparison of mortality factors between experimental sites, and indicated that larval disappearance was consistently the most important mortality factor, followed by egg disappearance, larval parasitism and pupal parasitism. The appropriateness of the methods and assumptions made to calculate the marginal death rates are discussed. 5 The technique represents a robust and easily repeatable method for the analysis of the activity of natural enemies of P. xylostella, which could be adapted for the study of other phytophagous pests.

Suitability of Arabidopsis thaliana as a model for host plant-Plutella xylostella-Cotesia plutellae interactions

Successful pest management is often hindered by the inherent complexity of the interactions of a pest with its environment. The use of genetically characterized model plants can allow investigation of chosen aspects of these interactions by limiting the number of variables during experimentation. However, it is important to study the generic nature of these model systems if the data generated are to be assessed in a wider context, for instance, with those systems of commercial significance. This study assesses the suitability of Arabidopsis thaliana (L.) Heynh. (Brassicaceae) as a model host plant to investigate plant-herbivore-natural enemy interactions, with Plutella xylostella (L.) (Lepidoptera: Plutellidae), the diamondback moth, and Cotesia plutellae (Kurdjumov) (Hymenoptera: Braconidae), a parasitoid of P. xylostella. The growth and development of P. xylostella and C. plutellae on an A. thaliana host plant (Columbia type) were compared to that on Brassica rapa var. pekinensis (L.) (Brassicaceae), a host crop that is widely cultivated and also commonly used as a laboratory host for P. xylostella rearing. The second part of the study investigated the potential effect of the different A. thaliana background lines, Columbia and Landsberg (used in wider scientific studies), on growth and development of P. xylostella and C. plutellae. Plutella xylostella life history parameters were found generally to be similar between the host plants investigated. However, C. plutellae were more affected by the differences in host plant. Fewer adult parasitoids resulted from development on A. thaliana compared to B. rapa, and those that did emerge were significantly smaller. Adult male C. plutellae developing on Columbia were also significantly smaller than those on Landsberg A. thaliana.

Efeito de extratos aquosos de Azadirachta indica, Melia azedarach e Aspidosperma pyrifolium no desenvolvimento e oviposição de Plutella xylostella

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Relationship between predation by Podisus nigrispinus and developmental phase and density of its prey, Plutella xylostella

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Classification of crucifer cultivars based on the life-history of diamondback moth (Plutella xylostella)

We compared different cultivars and hybrids of crucifers in relation to development and life-history of diamondback moth (Plutella xylostella) to classify the plants according to their resistance to the pest. The plants used were Manteiga da Geórgia kale, Bola de Neve cauliflower, Ramoso Piracicaba Precoce broccoli, Chato-de-quintal cabbage, and the hybrid cabbages Midori, TPC668, TPC308, and TPC681. We evaluated performance daily until the pupal stage. Pupae were assessed individually to determine the pupal weight, performance, and pupal period. We determined the sex ratio, fecundity, fertility, and longevity of the emerged adults and calculated their reproductive potential. Cabbage hybrids TPC668, TPC308, and TPC681 do not support the development and reproduction of the diamondback moth. These hybrids show a level of resistance that is similar to that found the commercially available hybrid Midori and cultivar Chato de Quintal, which are known to be resistant to the diamondback moth. This finding implies that the capitata (cabbage) cultivars are the most suitable for planting because they are more resistant to pest than the cultivar's moth, acephala (kale). © 2013 Copyright Taylor and Francis Group, LLC.

Evaluación del rendimiento agronómico de doce cultivares de repollo (Brassica oleracea L) y la incidencia de Plutella xylostella L, en la Estación experimental Raul González, valle de Sébaco, Matagalpa

El estudio se realizó en la Estación experimental Raúl González del valle de Sébaco de Junio a Septiembre de 1994. Con el objetivo de determinar las características agronómicas de cada cultivar de repollo (Brasica olearacea L), para resolver algunos problemas de pequeños y medianos productores que demandan cultivares con buen rendimiento y resistente a plagas y enfermedades. Se evaluaron las variedades: Gluckstadter Mittelfrüher, Yeshen, Migthy YR, Copenhagen Market, Conquest, Izalco, Fortuna, Grenadier, Discovery, Giant, Superette YR y Glory of Enkhuizen. El diseño utilizado fue de Bloques Completos al Azar (B.C.A) con cuatro repeticiones, evaluándose las variables de crecimiento y desarrollo del cultivo, así como lo relacionado al rendimiento agronómico y la incidencia de Plutella xylostella L. Los datos obtenidos se sometieron al análisis de varianza y a la prueba de Tukey. Las variedades de mejor crecimiento y desarrollo fueron: Yeshen, Migthy YR, Superette YR, Fortuna e Izalco. En las variables de calidad no se obtuvo diferencia significativa., sin embargo, los cultivares Superette YR, Izalco y Fortuna resultaron con el mayor índice de compactación. Respecto al rendimiento los cultivares Grenadier, Izalco y Fortuna obtuvieron el mayor porcentaje de formación de cabezas así como, el mayor peso de cabeza por hectárea. Los insecticidas utilizados para el manejo de P xylostella no lograron reducir sus poblaciones durante las etapas de preformación y llenado de cabezas. Al finalizar el ciclo del cultivo se presentó Xanthomonas campestris p. y campestris resultando tolerantes los cultivares Grenadier, Discovery, Izalco, Migthy YR y Fortuna; perdiendo casi la totalidad de su población las variedades: Glory of Enkhuizen, Copenhagen Market y Conquest.

Evaluación de criterios de aplicación para el manejo de Plutella xylostella (L) en repollo (Brassica oleracea L.)

Con el objetivo de evaluar diferentes criterios de aplicación para el manejo de Plutella xylostella (L.) en el cultivo de repollo se realizó un experimento de campo en la época de primera en el Centro experimental de campos Azules (Masatepe, Departamento de Masaya), se mantuvieron diferentes niveles de esta plaga por medio de aplicaciones semanales del insecticida Chlorfluazurón (Júpiter) a una dosis de 182 cc/ha. La incidencia de la plaga no fue uniforme durante el ciclo del cultivo, oscilando por encima de los niveles establecidos a partir de los 28 DDT. La mayor incidencia fue de 1.2 larvas/planta en la etapa de formación de cabeza y de 3 3 larvas/planta para la etapa de llenado de cabeza afectando el área foliar, precio por cabeza, y los ingresos económicos. A los resultados agronómicos se les aplicó un análisis económico, resultando del aná11s1s de retorno marginal, tasas de retornos marginales