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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Stink bugs on grain sorghum in Mississippi ecological relationships with host plants and crop planting dates and crop damage /

Parada Jaco, Mario Ernesto, January 2007 (has links)
Thesis (Ph.D.)--Mississippi State University. Department of Entomology and Plant Pathology. / Title from title screen. Includes bibliographical references.
12

Historia natural de Edessa rufomarginata De Geer (Heteroptera: Pentatomidae) em vegetação de cerrado = aspectos biologivos, ecologicos e comportamentais de um percevejo-do-mato / Natural history of Edessa rufomarginata De Geer (Heteroptera: Pentatomidae) in teh cerrado vegetation : biological, ecological and behavioral aspects of a stink bug

Silva, Daniel de Paiva 03 January 2010 (has links)
Orientador: Paulo Sergio Moreira Carvalho de Oliveira / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-15T12:05:44Z (GMT). No. of bitstreams: 1 Silva_DanieldePaiva_M.pdf: 1700157 bytes, checksum: d9180c7f3be18cfe31710dc9712539a6 (MD5) Previous issue date: 2010 / Resumo: Pentatomídeos são importantes pestes agrícolas que podem causar danos diretos e indiretos às plantas e à economia. Entretanto, muitos aspectos de sua biologia e ecologia em ambientes naturais ainda são desconhecidos. Este estudo apresenta informações relacionadas à biologia e ecologia do pentatomídeo Edessa rufomarginata (De Geer, 1773) sobre o pequizeiro, Caryocar brasiliense Camb. (Caryocaraceae), uma planta típica do cerrado. Fêmeas de E. rufomarginata não apresentaram cuidado maternal e ovipuseram em maior freqüência sobre plantas grandes. Entretanto, as freqüências de oviposição em plantas com botões florais/frutos não diferiram estatisticamente daquelas observadas em plantas sem tais estruturas. Ninfas de primeiro instar permanecem agrupadas e dispersam-se na planta hospedeira somente a partir do segundo ínstar. Indivíduos adultos foram mais abundantes sobre ramos maduros e novos de C. brasiliense, enquanto as ninfas foram mais abundantes sobre ramos maduros e folhas. Formigas constantemente antenavam o abdômen de ninfas de terceiro a quinto ínstar de E. rufomarginata, e por duas vezes, foram observadas consumindo seu exsudato. A interação do percevejo com inimigos naturais, como o reduvídeo Heniartes sp. também foi observada. Este é um dos primeiros estudos sobre a biologia e ecologia de E. rufomarginata em ambientes naturais, bem como um dos primeiros estudos a observar a ocorrência de interações trofobióticas destes insetos com formigas. Assim, mais estudos envolvendo este percevejo são necessários para uma melhor compreensão de sua biologia e ecologia, bem como sua interação com formigas e eventuais inimigos naturais capazes de atuar como agentes de controle biológico em ambientes agrícolas. / Abstract: Pentatomids are important crop pests that cause direct and indirect plant and economical damages. However, several biological and ecological features in natural environments remain unknown. The present study presents information concerning the biology and ecology of Edessa rufomarginata (De Geer, 1773) on C. brasiliense Camb. (Caryocaraceae), a typical plant species from the Brazilian Cerrado savanna. E. rufomarginata females did not present maternal care and preferred to laid their eggs more frequently on bigger plants. However, the oviposition frequency was not different between plants with floral buds/fruits and plants without these structures. First-instar nymphs remained aggregated and only dispersed in the second instar onwards. Adults were more abundant on mature and young stems of C. brasiliense, whereas nymphs were more abundant on mature stems and leaves. Ants frequently tapped the abdomen of E. rufomarginata nymphs with their antennae, and at least on two occasions the ants were seen consuming their honeydew. The interaction of the bug with other natural enemies, such as the predaceous reduviid Heniartes sp., was also observed. This is one of the first studies concerning the biology and ecology of E. rufomarginata in natural environments, as well as one of the first ones to observe the occurrence of trophobiotic interactions between stink bugs and ants. Therefore, further studies related to this stink bug are necessary to a better understanding of its biology and ecology, as well as its interaction with ants and natural enemies which can potentially act as agents of biological control in agricultural environments. / Mestrado / Ecologia / Mestre em Ecologia
13

Activity patterns, species composition and dietary analysis of bats on two macadamia farms in Levubu, South Africa

Mphethe, Vusani 18 September 2017 (has links)
MENVSC / Department of Ecology and Resource Management / See the attached abstract below

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