Milkweed
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Aleopatia de fungos fitopatogÃnicos sobre plantas invasoras das culturas de soja e milho / Allelopathy of plant pathogenic fungi on invasive plants on the cultures of soybean and corn
Invasive plants can cause problems to the exploitation of agriculture worldwide. The chemical control of these plants has generated several environmental problems, such as the contamination of natural resources, the compromising the food quality, the poisoning of farmers, the development of the weedâs resistance, among others. An alternative to reduce the u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2011
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2. Respostas a herbivoria em Asclepias curassavica (Apocynaceae: Asclepiadoideae) : defender, crescer ou reproduzir / Responses to herbivory in Asclepias curassavica (Apocynaceae: Asclepiadoideae) : to defeat, grow or reproduce
A produção de defesas contra a herbivoria é essencial para o sucesso reprodutivo das plantas, no entanto pode ser custosa. Esses custos resultam da redução de investimento em outras partes do metabolismo, como o crescimento e a reprodução. Nesse estudo, usamos Asclepias curassavica (Apocynaceae: Asclepiadoideae) como modelo para avaliar como uma plant
Publicado em: 2008
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3. Corn pollen deposition on milkweeds in and near cornfields
The density of corn pollen on leaves of milkweed plants inside and outside of cornfields was measured in several studies from different localities. The purpose was to obtain a representative picture of naturally occurring pollen densities to provide a perspective for laboratory and field studies of monarch larvae feeding on milkweed leaves with Bt corn polle
The National Academy of Sciences.
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4. Temporal and spatial overlap between monarch larvae and corn pollen
To assess the likelihood that monarch larvae will be exposed to Bacillus thuringiensis (Bt) pollen, we studied milkweed and monarch densities in habitats which comprise much of the land available to breeding monarchs, e.g., cornfields, cornfield edges, other agricultural fields, and nonagricultural areas, in four regions of the monarch breeding range. We fou
The National Academy of Sciences.
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5. Impact of Bt corn pollen on monarch butterfly populations: A risk assessment
A collaborative research effort by scientists in several states and in Canada has produced information to develop a formal risk assessment of the impact of Bt corn on monarch butterfly (Danaus plexippus) populations. Information was sought on the acute toxic effects of Bt corn pollen and the degree to which monarch larvae would be exposed to toxic amounts of
The National Academy of Sciences.
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6. Monarch larvae sensitivity to Bacillus thuringiensis- purified proteins and pollen
Laboratory tests were conducted to establish the relative toxicity of Bacillus thuringiensis (Bt) toxins and pollen from Bt corn to monarch larvae. Toxins tested included Cry1Ab, Cry1Ac, Cry9C, and Cry1F. Three methods were used: (i) purified toxins incorporated into artificial diet, (ii) pollen collected from Bt corn hybrids applied directly to milkweed lea
The National Academy of Sciences.
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7. Insect Feeding Deterrents in Endophyte-Infected Tall Fescue †
The presence of an endophytic fungus, Acremonium coenophialum, in tall fescue (Festuca arundinacea) deterred aphid feeding by Rhopalosiphum padi and Schizaphis graminum. Both species of aphid were unable to survive when confined to endophyte-infected tall fescue plants. Feeding deterrents and toxic factors to R. padi and Oncopeltus fasciatus, large milkweed
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8. Assessing the impact of Cry1Ab-expressing corn pollen on monarch butterfly larvae in field studies
Survival and growth of monarch larvae, Danaus plexippus (L.), after exposure to either Cry1Ab-expressing pollen from three Bacillus thuringiensis (Bt) corn (Zea mays L.) events differing in toxin expression or to the insecticide, λ-cyhalothrin, were examined in field studies. First instars exposed to low doses (≈22 grains per cm2) of event-176 pollen gain
The National Academy of Sciences.