A text-book of agricultural entomology : being a guide to methods of insect life and means of prevention of insect ravage for the use of agriculturists and agricultural students /

Mode of access: Internet.

Capacidade reprodutiva e preferência da traça-das-crucíferas para diferentes brassicáceas

O objetivo desta pesquisa foi comparar diferentes cultivares de brassicáceas em relação à capacidade reprodutiva e preferência para alimentação e oviposição da traça-das-crucíferas. Os experimentos foram realizados utilizando-se as cultivares de repolho Midori, Chato-de-Quintal, híbridos da Top Seed® - Agristar (TPC 308, TPC 681 e TPC 668), couve-flor Bola de Neve, couve brócolis Ramoso Piracicaba Precoce e couve Manteiga da Geórgia, sendo esta última utilizada como padrão de suscetibilidade. Por meio dos dados biológicos de P. xylostella foram estimados os parâmetros necessários para a construção de tabela de vida de fertilidade, para comparação das cultivares testadas em relação à capacidade reprodutiva da praga. em gaiolas de criação da traça-das-crucíferas foram colocados quatro quartos de folha, dois a dois, que justapostos formavam um círculo de 8 cm de diâmetro, confrontando-se os materiais dois a dois. As partes foram dispostas equidistantemente, para realização do teste de dupla chance de escolha (preferência para alimentação e oviposição) e de múltipla chance de escolha, confrontando todos os substratos (preferência para alimentação). As cultivares que proporcionaram melhor desenvolvimento e reprodução para a traça-das-crucíferas foram couve Manteiga da Geórgia e couve brócolis. Para preferência alimentar constatou-se alta suscetibilidade em couve Manteiga e TPC 681 e para preferência de oviposição alta preferência para couve-flor Bola de Neve. Com isso, sugere-se a divisão das cultivares estudadas em quatro classes distintas: repolho Midori como moderadamente resistente (MR); couve-flor Bola de Neve e repolho Chato-de-Quintal como suscetíveis (S); couve brócolis, TPC308, TPC681 e TPC668 como moderadamente suscetíveis (MS); e couve Manteiga como altamente suscetível (AS).

Seleção de isolados de Beauveria bassiana potenciais para o controle da traça-das-crucíferas

A traça-das-crucíferas, Plutella xylostella (Lepidoptera: Plutellidae), é considerada a principal praga das brássicas no mundo, sendo o uso de inseticidas o método mais usado para o seu controle. Assim, o objetivo desta pesquisa foi selecionar isolados de Beauveria bassiana com viabilidade para utilização no controle da traça-das-crucíferas. Dezessete isolados e um produto comercial de B. bassiana foram testados. Lagartas de segundo ínstar da traça-das-crucíferas foram pulverizadas com suspensão de conídios na concentração de 10(7) conídios mL-1. Para o bioensaio de concentração letal (CL) sete concentrações espaçadas em escala logarítmica foram testadas. Os isolados CCA/UFES-4, 18, 31 e 35 foram selecionados para o bioensaio de CL por causarem mortalidade confirmada superior a 90%. O isolado padrão ESALQ-447 e o produto comercial tiveram resultados semelhantes e também foram selecionados para o bioensaio de CL. Com base nas estimativas da CL50, os isolados CCA/UFES-4, 18, 31, ESALQ-447 e o produto comercial podem ser selecionados para utilização no controle da traça-das-crucíferas.

Resistance of squash cultivars to Aphis gossypii

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

Colonies of insects, mites, ticks, and spiders maintained in laboratories of the Entomology Research and Market Quality Research Divisions of the Agricultural Research Service, U. S. Dept. of Agriculture.

Mode of access: Internet.

Colonies of insects, mites, ticks, and spiders maintained in laboratories of the Entomology Research and Market Quality Research Divisions of the Agricultural Research Service, U. S. Dept. of Agriculture.

Mode of access: Internet.

Colonies of insects, mites, and ticks maintained in laboratories of the Entomology Research and Market Quality Research Divisions of the Agricultural Research Service, U. S. Dept. of Agriculture,

Cover title.

A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist,

Bibliographies interspersed.

Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; /

Mode of access: Internet.

A brief history of entomology at the Agricultural and Mechanical College of Texas : prior to the integration of the services in 1947 /

Mode of access: Internet.

Seasonal activity and abundance of Orosius orientalis (Hemiptera : Cicadellidae) at agricultural sites in Southeastern Australia

Orosius orientalis is a leafhopper vector of several viruses and phytoplasmas affecting a broad range of agricultural crops. Sweep net, yellow pan trap and yellow sticky trap collection techniques were evaluated. Seasonal distribution of O. orientalis was surveyed over two successive growing seasons around the borders of commercially grown tobacco crops. Orosius orientalis seasonal activity as assessed using pan and sticky traps was characterised by a trimodal peak and relative abundance as assessed using sweep nets differed between field sites with peak activity occurring in spring and summer months. Yellow pan traps consistently trapped a higher number of O. orientalis than yellow sticky traps.

Diversity of Cicadellidae in agricultural production areas in the Ovens Valley, Northeast Victoria, Australia

There is a paucity of data on the distribution of Cicadellidae (leafhoppers) in Australia. This study quantifies the relative abundance, seasonal activity and diversity of leafhoppers in the Ovens Valley region of north-east Victoria, Australia. Species diversity and abundance was assessed at four field sites in and around the field borders of commercially grown tobacco crops using three sampling techniques (pan trap, sticky trap and sweep net). Over 51 000 leafhopper samples were collected, with 57 species from 11 subfamilies and 19 tribes identified. Greater numbers and diversity of leafhoppers were collected in yellow pan traps. The predominant leafhopper collected was Orosius orientalis (Matsumura). Twenty-three leafhopper species were recorded for the first time in Victoria and eight economically important pest species were recorded. Seasonal activity of selected leafhopper species, covering two sampling seasons, is presented.

The impact of an insecticide on insect flower visitation and pollination in an agricultural landscape

1 Pesticides are considered a threat to pollinators but little is known about the potential impacts of their widespread use on pollinators. Less still is known about the impacts on pollination, comprising the ecosystem service that pollinators provide to wildflowers and crops. 2 The present study measured flower visitation and pollination in an agricultural landscape, by placing potted flowering plants (Petunia sp.) in vine fields sprayed with a highly toxic insecticide (fenitrothion). During two sampling rounds, insect visitors to the petunias were observed and measures of pollination were recorded by counting and weighing seeds. 3 In the earlier sampling round, a lower species richness of insect visitors was observed in fields that had received an early application of insecticide. No negative impacts were found from later applications. The results obtained suggest a greater potential harm to insect pollinators and flower visitation as a result of insecticide application early in the season. 4 No reduction in pollination was found in fields that received an early insecticide application. Pollination was greater with two insecticide applications between sampling rounds rather than one application. 5 In the present study system, insecticide application had a negative effect on pollinators but a possible positive effect on pollination services. In some cases, it may be that actions for conserving biodiversity will not benefit pollination services to all plants.

Book Review of Entomology at the Land Grant University: Perspectives from the Texas A&M University Department Centenary Edited by Kevin M. Heinz, Raymond Frisbie, and Carlos Bogran

This book offers the texts of twenty-four presentations given in a series of mini symposia organized to commemorate the centennial of Texas A&M's Department of Entomology. Although not stated explicitly by the editors, the central theme for these symposia seems to be the contributions of the discipline of entomology to modern society. The presentations cover a wide range of topics dealing with the importance of insects in both natural ecosystems and agricultural systems; insects as models for scientific research; challenges associated with effective management of those species that are pests in systems designed for food and fiber production; and the role of entomology departments within academic institutions, particularly land-grant universities. The list of contributors to these symposia is impressive, as are the universities and other institutions they represent across the United States as well as in Europe and Africa.