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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
23/10/2009 |
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Data da última atualização: |
27/04/2011 |
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Autoria: |
NEWMAN, G. G. |
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Afiliação: |
GARY GRANT NEWMAN. |
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Título: |
The biology of Entomophthora gammae and its effect on populations of the soybean looper, Pseudoplusia includens, in South Carolina. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
1975. |
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Páginas: |
84 f. |
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Idioma: |
Inglês |
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Notas: |
Dissertação (Doutorado) - Clemson University, Clemson. |
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Conteúdo: |
Larval populations of Pseudoplusia includens (Walker) were monitored on soybeans and sweet potatoes in 1973 and on soybeans in 1974. Mortality was caused by the pathogens Entomophthora gammae (Weiser), Nomuraea rileyi (Farlow) Samson, and a nuclear polyhedrosis virus; and the parasitoids Copidosoma truncatellum (Dalman) and Lespesia alletiae (Riley). When looper populations were high, E. gammae was the most important natural control agent, often causing disease incidence exceeding 70%. In fields where looper populations were low, incidence of E. gammae was reduced.
Incidence of E. gammae infection was higher in loopers collected by the sweep-net method of sampling than in those collected by the plant-shake method. Incidence of N. rileyi was not significantly different in larvae collected by the two sampling methods.
The conidial form of E. gammae killed its host in 4 days at temperatures approximating those in the field. The resting spore form had an incubation period of 5 to 8 days. Larvae infected with the conidial form of the pathogen died within a rather precise time period of the early evening (6-10 PM). Sporulation began on fresh cadavers just prior to midnight and continued until after dawn. Larvae infected with the resting spore form died at various times.
As field epizootics of E. gammae progressed, high numbers of the conidial form gave way to high numbers of the resting spore form. Ratios of conidia to resting spores were not significantly altered when infected larvae were exposed to shortened photoperiod or to cooler temperatures. Size or age of infected larvae appeared to influence spore development, conidia being predominant in small larvae (>1.5cm) and resting spores in large larvae (<2.5 cm).
The fungus was able to sporulate at relative humidities of 80-100% but was inactivated by humidities of 50% and below. Conidia germinated at 98 and 100% RH but could not survive exposure to humidities below 75%. E gammae sporulated and germinated at 10-26.7ºC but could not survive prolonged exposure to 32.2 or 37.8ºC. When cadavers were frozen, the pathogen was inactivated in less than 1h.
Exposure to the pesticides carbaryl, methomy1, methy1, parathion, DimilinR, and benomyl caused conidial germination to be reduced. Dimilin was less inhibitory than the other chemicals. MenosLarval populations of Pseudoplusia includens (Walker) were monitored on soybeans and sweet potatoes in 1973 and on soybeans in 1974. Mortality was caused by the pathogens Entomophthora gammae (Weiser), Nomuraea rileyi (Farlow) Samson, and a nuclear polyhedrosis virus; and the parasitoids Copidosoma truncatellum (Dalman) and Lespesia alletiae (Riley). When looper populations were high, E. gammae was the most important natural control agent, often causing disease incidence exceeding 70%. In fields where looper populations were low, incidence of E. gammae was reduced.
Incidence of E. gammae infection was higher in loopers collected by the sweep-net method of sampling than in those collected by the plant-shake method. Incidence of N. rileyi was not significantly different in larvae collected by the two sampling methods.
The conidial form of E. gammae killed its host in 4 days at temperatures approximating those in the field. The resting spore form had an incubation period of 5 to 8 days. Larvae infected with the conidial form of the pathogen died within a rather precise time period of the early evening (6-10 PM). Sporulation began on fresh cadavers just prior to midnight and continued until after dawn. Larvae infected with the resting spore form died at various times.
As field epizootics of E. gammae progressed, high numbers of the conidial form gave way to high numbers of the resting spore form. Ratios of conidia to resting spores were not significantly altered when infecte... Mostrar Tudo |
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Thesagro: |
Entomologia. |
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Categoria do assunto: |
O Insetos e Entomologia |
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Marc: |
LEADER 02794nam a2200145 a 4500
001 1573021
005 2011-04-27
008 1975 bl uuuu m 00u1 u #d
100 1 $aNEWMAN, G. G.
245 $aThe biology of Entomophthora gammae and its effect on populations of the soybean looper, Pseudoplusia includens, in South Carolina.
260 $a1975.$c1975
300 $a84 f.
500 $aDissertação (Doutorado) - Clemson University, Clemson.
520 $aLarval populations of Pseudoplusia includens (Walker) were monitored on soybeans and sweet potatoes in 1973 and on soybeans in 1974. Mortality was caused by the pathogens Entomophthora gammae (Weiser), Nomuraea rileyi (Farlow) Samson, and a nuclear polyhedrosis virus; and the parasitoids Copidosoma truncatellum (Dalman) and Lespesia alletiae (Riley). When looper populations were high, E. gammae was the most important natural control agent, often causing disease incidence exceeding 70%. In fields where looper populations were low, incidence of E. gammae was reduced. Incidence of E. gammae infection was higher in loopers collected by the sweep-net method of sampling than in those collected by the plant-shake method. Incidence of N. rileyi was not significantly different in larvae collected by the two sampling methods. The conidial form of E. gammae killed its host in 4 days at temperatures approximating those in the field. The resting spore form had an incubation period of 5 to 8 days. Larvae infected with the conidial form of the pathogen died within a rather precise time period of the early evening (6-10 PM). Sporulation began on fresh cadavers just prior to midnight and continued until after dawn. Larvae infected with the resting spore form died at various times. As field epizootics of E. gammae progressed, high numbers of the conidial form gave way to high numbers of the resting spore form. Ratios of conidia to resting spores were not significantly altered when infected larvae were exposed to shortened photoperiod or to cooler temperatures. Size or age of infected larvae appeared to influence spore development, conidia being predominant in small larvae (>1.5cm) and resting spores in large larvae (<2.5 cm). The fungus was able to sporulate at relative humidities of 80-100% but was inactivated by humidities of 50% and below. Conidia germinated at 98 and 100% RH but could not survive exposure to humidities below 75%. E gammae sporulated and germinated at 10-26.7ºC but could not survive prolonged exposure to 32.2 or 37.8ºC. When cadavers were frozen, the pathogen was inactivated in less than 1h. Exposure to the pesticides carbaryl, methomy1, methy1, parathion, DimilinR, and benomyl caused conidial germination to be reduced. Dimilin was less inhibitory than the other chemicals.
650 $aEntomologia
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agropecuária Oeste. |
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Data corrente: |
08/01/2019 |
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Data da última atualização: |
08/01/2019 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
JUREMEIRA, J. S.; KURIHARA, C. H.; STAUT, L. A.; TOMAZI, M.; SILVA, C. J. da. |
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Afiliação: |
JEFERSON SOUZA JUREMEIRA, GRADUANDO EM AGRONOMIA - CENTRO UNIVERSITÁRIO DA GRANDE DOURADOS, DOURADOS; CARLOS HISSAO KURIHARA, CPAO; LUIZ ALBERTO STAUT, CPAO; MICHELY TOMAZI, CPAO; CESAR JOSE DA SILVA, CPAO. |
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Título: |
Crescimento e matéria seca da Crotalaria juncea L. em diferentes sistemas de preparo de solo. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2018, Dourados. Resumos... Brasília, DF: Embrapa, 2018. JIPE 2018. |
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ISBN: |
978-85-7035-846-2 |
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Idioma: |
Português |
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Thesagro: |
Adubação Verde; Biomassa; Crotalária; Plantio Direto; Produtividade; Solo. |
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Thesaurus NAL: |
Biomass; Green manures; No-tillage; Seed productivity. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/189941/1/ORAL11.pdf
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Marc: |
LEADER 00867nam a2200277 a 4500
001 2103260
005 2019-01-08
008 2018 bl uuuu u00u1 u #d
020 $a978-85-7035-846-2
100 1 $aJUREMEIRA, J. S.
245 $aCrescimento e matéria seca da Crotalaria juncea L. em diferentes sistemas de preparo de solo.$h[electronic resource]
260 $aIn: JORNADA DE INICIAÇÃO À PESQUISA DA EMBRAPA, 2018, Dourados. Resumos... Brasília, DF: Embrapa, 2018. JIPE 2018.$c2018
650 $aBiomass
650 $aGreen manures
650 $aNo-tillage
650 $aSeed productivity
650 $aAdubação Verde
650 $aBiomassa
650 $aCrotalária
650 $aPlantio Direto
650 $aProdutividade
650 $aSolo
700 1 $aKURIHARA, C. H.
700 1 $aSTAUT, L. A.
700 1 $aTOMAZI, M.
700 1 $aSILVA, C. J. da
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Embrapa Agropecuária Oeste (CPAO) |
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