Adriana Mascarette Labinas

Comparative biology of the whitefly Trialeurodes vaporariorum (West.) (Hemiptera - Homoptera: Aleyrodidae) on soybean and bean cultivars

With the development of greenhouse grown crops, the whitefly Trialeurodes vaporariorum (West.) has become an important pest. Aiming at verifying the effect of host on the development of this species, the biology of the whitefly was studied on bean (Phaseolus vulgaris L.) cultivars IAC-Carioca Pyata, IAPAR-57, Jalo Precoce, IAC-Bico de Ouro, IAC-Maravilha and on soybean (Glycine max L.) cultivar Cristalina. The study was conducted at the Laboratorio de Entomologia Agricola - FCA-UNESP, at 25 ± 3°C temperature, 80 ± 10% RH and 14h photophase. The biological parameters assessed were duration, viability and number of nymphal instars; male and female longevity, oviposition period, number of eggs per female and sex ratio; egg viability and incubation period and the life cycle duration. Based on data obtained, fertility life tables were constructed to allow a comparative analysis of the effect of cultivars on the biological development and consequent population growth of this species. The bean cultivars IAC-Maravilha and Jalo Precoce negatively influenced T. vaporariorum development, whereas, the other bean cultivars studied, as well as the soybean cultivar Cristalina, provided good conditions for development of this pest.

Controle de pragas do pessegueiro através do ensacamento dos frutos

Aiming to look for new options of peach bagging in the control of peach insect pests, an experiment was carried out in a treeyear-old peach crop. The cultivar Aurora 2 was accomplished in vase system with 6 m among rows and 4 m among plants. The treatments were: T1 - white and closed TNT (tissue non-tissue) bag (45g/m2), T2 - white and opened TNT bag (45g/m2), T3 - white and closed TNT bag (20g/m2), T4 - white and opened TNT bag (20g/m2), T5 - transparent polypropelene microperfurated and closed bag (1mm of diameter), T6 - transparent polypropelene microperfurated and opened bag (1mm of diameter), T7 - transparent polypropelene microperfurated and closed bags (2mm of diameter), T8 - transparent polypropelene microperfurated and opened bag (2mm of diameter), T9 - milky microperfurated polyetilene and closed bag (1mm of diameter), T10 - milky microperfurated polyetilene and opened bag (1mm of diameter), T11 - milky microperfurated polyetilene and closed bag (2mm of diameter), T12 - milky microperfurated polyetilene and opened bags (2mm of diameter), T13 - closed and waterproof paper bag, T14 - opened and waterproof paper bag, T15 - check treatment (unbagging fruits). According to the results, it may be concluded that all bags are efficient to control fruit flies and birds, but not the oriental fruit moth. The opened bags may be used in peach bagging.

Feeding substrates to black coconut bunch weevil, Homalinotus coriaceus (Gyllenhal) (Coleoptera: Curculionidae), rearing in laboratory

A broca do cacho do coqueiro, Homalinotus coriaceus (Gyllenhal), e uma praga limitante da producao de coco no Brasil, sendo que tanto as larvas como os adultos provocam a queda das flores femininas e dos frutos imaturos, pela interceptacao do fluxo de seiva ou pela alimentacao direta nas estruturas reprodutivas. Em virtude da escassez de informacoes sobre sua biologia, realizou-se esse trabalho com o objetivo de desenvolver uma metodologia mais adequada para a criacao da praga em laboratorio. Foram utilizados os parâmetros biologicos para avaliacao e comparacao dos sistemas de criacao estudados.Toletes de cana-de-acucar foram utilizados como substrato para alimentacao dos adultos coletados no campo e obtencao dos ovos. As larvas foram criadas em tres substratos alimentares no Laboratorio de Entomologia da Embrapa-CPATC (Centro de Pesquisa Agropecuaria dos Tabuleiros Costeiros), em Aracaju, SE. Os substratos alimentares estudados foram: o mesocarpo do coco, dieta para criacao da broca dos citros e dieta para criacao da broca do olho do coqueiro, sendo esta a que proporcionou o melhor desenvolvimento larval num menor tempo, com boa viabilidade, maior facilidade no preparo e manutencao.