Larvae Resistance
Mostrando 25-36 de 155 artigos, teses e dissertações.
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25. Evolution of insecticide resistance in non-target black flies (Diptera: Simuliidae) from Argentina
Black flies, a non-target species of the insecticides used in fruit production, represent a severe medical and veterinary problem. Large increases in the level of resistance to the pyrethroids fenvalerate (more than 355-fold) and deltamethrin (162-fold) and a small increase in resistance to the organophosphate azinphos methyl (2-fold) were observed between 1
Memórias do Instituto Oswaldo Cruz. Publicado em: 2012-06
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26. The efficacy of a chitin synthesis inhibitor against field populations of organophosphate-resistant Aedes aegypti in Brazil
The mosquito Aedes aegypti is the main focus of dengue control campaigns. Because of widespread resistance against conventional chemical insecticides, chitin synthesis inhibitors (CSIs) are considered control alternatives. We evaluated the resistance status of four Brazilian Ae. aegypti populations to both the organophosphate temephos and the pyrethroid delt
Mem. Inst. Oswaldo Cruz. Publicado em: 2012-05
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27. Performance and stress resistance of Nile tilapias fed different crude protein levels
The objective of this study was to evaluate the effect of different levels of diet crude protein on the performance and stress resistance rate (Re) of Oreochromis niloticus larvae and fingerlings. In the first experiment, 5, 15 and 25 day-old animals were submitted to 1, 5, 7, 10, 15, 20, 30 and 40 minutes of air exposure on a sieve. In the second experiment
Revista Brasileira de Zootecnia. Publicado em: 2012-02
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28. Identification of Albizia lebbeck seed coat chitin-binding vicilins (7S globulins) with high toxicity to the larvae of the bruchid Callosobruchus maculatus
Seed coat is a specialized maternal tissue that interfaces the embryo and the external environment during embryogenesis, dormancy and germination. In addition, it is the first defensive barrier against penetration by pathogens and herbivores. Here we show that Albizia lebbeck seed coat dramatically compromises the oviposition, eclosion and development of the
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-02
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29. Estudo do mecanismo de ação da atividade acaricida de Calea serrata (Asteraceae) em Rhipicephalus (Boophilus) microplus e da sua toxicidade em roedores
It has been demonstrated that the n-hexane extract of Calea serrata had acaricidal activity against larvae of R. microplus and R. sanguineus. Acetylcholinesterase (AChE), an enzyme that hydrolyses acetylcholine at cholinergic synapses, is a target for pesticides and its inhibition by organophosphates leads to paralysis and death of arthropods. Extensive uses
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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30. Biocontrol of pigeon tick Argas reflexus (Acari: Argasidae) by entomopathogenic fungus Metarhizium Anisopliae (Ascomycota: Hypocreales)
The pigeon tick Argas reflexus is a pathogen-transmitting soft tick that typically feeds on pigeons, but can also attack humans causing local and systemic reactions. Chemical control is made difficult due to environmental contamination and resistance development. As a result, there is much interest in increasing the role of other strategies like biological c
Braz. J. Microbiol.. Publicado em: 2011-12
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31. Aedes aegypti survival in the presence of Toxorhynchites violaceus (Diptera: Culicidae) fourth instar larvae
The mosquito Aedes aegypti (Linnaeus, 1762) is the main vector of dengue and yellow fever viruses. Different methods have been used to control A. aegypti, including chemical and biological tools. However, chemical control can lead to a subsequent increase in the mosquitoes' insecticide resistance, and biological control represents an important method as an a
Zoologia (Curitiba). Publicado em: 2011-08
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32. Resistance of citrus genotypes to Phyllocnitis citrella Stainton (Lepidoptera: Gracillariidae)
The development and reproduction of the citrus leafminer (CLM), Phyllocnistis citrella Stainton, were evaluated in six citrus genotypes in order to identify genotypes with resistance traits that could be applied in a program for the development of citrus varieties resistant to the citrus leafminer. Tests were conducted under controlled laboratory conditions
Neotropical Entomology. Publicado em: 2011-08
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33. Resistance to Chalkbrood Disease in Apis mellifera L. (Hymenoptera: Apidae) Colonies with Different Hygienic Behaviour
Chalkbrood disease affects the larvae of honeybees Apis mellifera L. and is caused by the fungus Ascosphaera apis. Infected larvae die when they are stretched in the cap cell and suffer a gradual hardening that ends in a very hard structure (mummie). Several studies have demonstrated that colonies that express an efficient hygienic behaviour (uncapping of ce
Neotropical Entomology. Publicado em: 2011-02
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34. Resistência anti-helmíntica em rebanhos caprinos no estado do Ceará.
Goats of 45 farms in the State of Ceará, Brazil, were treated with anthelmintics for gastrointestinal nematodes, and their resistance to the anthelmintics was evaluated. On each farm 30 kids were weighed, ear-tagged and divided into three groups of ten. The first group received oxfendazofe at 4.75mg/kg, the second levamisole at 7.5mg/kg, and the third group
Pesquisa Veterinária Brasileira. Publicado em: 2011
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35. Efeito da alimentação de Schizaphis graminum com genótipos de sorgo no desenvolvimento do predador Cycloneda sanguinea.
O pulgão Schizaphis graminum (Rondani) (Hemiptera: Aphididae) é uma das principais pragas do sorgo. O objetivo deste trabalho foi determinar o efeito da alimentação deste inseto com genótipos de sorgo resistentes e suscetíveis no desenvolvimento do predador Cycloneda sanguinea (Linnaeus) (Coleoptera: Coccinellidae). O pulgão foi criado em folhas dos g
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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36. AvaliaÃÃo do efeito dos polissacarÃdeos sulfatados extraÃdos da microalga Dunaliella tertiolecta como imunoestimulante em juvenis de camarÃo Litopenaeus vannamei / Evaluation of the effect of sulfated polysaccharides extracted from the microalgae Dunaliella tertiolecta as immunostimulant in juvenile shrimp Litopenaeus vannamei
Aquaculture is one of the activities that most expands around the world and microalgae such as shrimps cultures have a great contribution into this progress. The aim of this study was the culture of the marine microlgae Dunaliella tertiolecta and extract its sulfated polysaccharides from the biomass and from the culture medium as well as to evaluate the effe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/08/2010