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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.
1

Temperature and infection by Metarhizium spp. in the desert locust

Bath, Abigail Jane January 1997 (has links)
No description available.
2

A comparative study of four species of Encarsia (Hymenoptera: Aphelinidae) as potential control agents for Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae)

Avila, Aristobulo Lopez January 1988 (has links)
No description available.
3

UtilizaÃÃo de peixes larvÃfagos para o controle das formas imaturas do A. aegypti em depÃsitos domiciliares de Ãgua. / Use larvivorous fish for the control of immature forms of A. aegypti in household water tanks.

Clemilson Nogueira Paiva 06 November 2013 (has links)
nÃo hà / O dengue permanece como importante problema de saÃde pÃblica e a principal estratÃgia de controle empregada permanece sendo o uso de larvicidas contra as formas imaturas de seu principal vetor, o mosquito Aedes aegypti. Por conta das limitaÃÃes existentes com o uso desses larvicidas à importante a busca por outras alternativas de controle. O uso de peixes larvÃfagos, como mecanismo de controle biolÃgico, tem sido incentivado e desta forma, o objetivo deste trabalho foi avaliar o comportamento de oviposiÃÃo de fÃmeas gravidas de Aedes aegypti na presenÃa de peixes larvÃfagos e a possibilidade de sua utilizaÃÃo em consÃrcio com os larvicidas recomendados pelo Programa Nacional de Controle do Dengue (PNCD). Foi adaptada a fÃrmula de Kramer e Mulla (1979) para cÃlculo do Ãndice de Atividade de OviposiÃÃo (IAO), com trÃs diferentes situaÃÃes. Foram testadas trÃs espÃcies de peixe (Betta splendens, Trichogaster tricopterus e Poecilia reticulata) e trÃs diferentes larvicidas (Bti, novaluron e temefÃs). Para determinar a capacidade de repelÃncia utilizamos uma gaiola com volume de 6m3, em que foram colocados nove tambores com capacidade para 70 litros de Ãgua. Em trÃs tambores foi colocado somente Ãgua (controle), em outros trÃs um peixe e nos outros trÃs o larvicidas a ser testado. ApÃs uma semana os mosquitos postos nessa gaiola eram retirados e os ovos contados com auxÃlio de um microscÃpio entomolÃgico. Cada associaÃÃo peixe/larvicida foi repetida 5 vezes, perfazendo um total de 30 experimentos. Para avaliar a sobrevivÃncia dos peixes utilizou-se 15 caixas dâÃgua com 250 litros de Ãgua. Em 10 caixas foi colocado o peixe com o respectivo larvicida a ser testado e em outras cinco, somente o peixe (controle). Cada associaÃÃo peixe/larvicida foi repetida 4 vezes. Os peixes T. tricopterus e P. reticulata nÃo apresentaram nenhuma influÃncia na atividade de oviposiÃÃo das fÃmeas de A. aegypti, o mesmo acontecendo com os larvicida novaluron e temefÃs. Jà o peixe B. splendens apresentou repelÃncia à postura de ovos, enquanto o larvicida Bti atraiu a postura por parte das fÃmeas grÃvidas. Todos os peixes avaliados sobreviveram aos larvicidas recomendados pelo PNCD, sugerindo ser viÃvel sua utilizaÃÃo em consÃrcio, em programas integrados de controle de vetores. / Dengue remains an important public health problem and the main control strategy employed remains the use of larvicides against the immature forms its principal vector , the mosquito Aedes aegypti. Because of limitations with the use of these larvicides is important to search for other alternatives control. The use of larvivorous fish, such as biological control mechanism, has been encouraged in the world and thus the objective of this study was to evaluate the oviposition behavior of pregnant females of Aedes aegypti in the presence of larvivorous fish and usability in consortium with larvicides recommended by the Program National Control Dengue (PNCD). Was adapted formula Kramer and Mulla (1979) for calculation of Oviposition Activity Index (OAI), with three different situations. We tested three species of fish (Betta splendens , Trichogaster tricopterus and Poecilia reticulata) and three different larvicides (Bti , novaluron and temefos). To determine the repellency use a cage with a volume of 6m3, where drums were placed nine with 70 liters of water. Three barrels were placed in water only (control), one in three other fish and other three larvicides to be tested. After a week the mosquitoes put this cage eggs were removed and counted with the aid of a microscope entomological. Each association fish / larvicide was repeated 5 times for a total of 30 experiments. To evaluate the survival of fish we used 15 water tanks with 250 liters of water. In 10 cases the fish was placed with its larvicide to be tested and in five, only the fish (control). Each association fish / larvicide was repeated 4 times. Fish T. tricopterus and P. reticulata showed no influence on oviposition activity of females of A. aegypti, the same happening with the larvicide temefos and novaluron. Already the fish B. splendens showed repellency to oviposition while the larvicide Bti attracted posture on the part of pregnant females. All fish survived the evaluated recommended larvicides PNCD, suggesting feasible to use in consortium programs in integrated vector control.

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