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Host Stage Structure and Baculovirus Transmission in Mamestra brassicae L. (Lepidoptera: Noctuidae) Larvae: a Laboratory Examination of Small Scale Epizootics Neotropical Entomology
VASCONCELOS,SIMÃO D.; CORY,JENNIFER S.; SPEIGHT,MARTIN R.; WILLIAMS,TREVOR.
The effects of stage structure and host density on baculovirus horizontal transmission were examined in the laboratory using larvae of the cabbage moth, Mamestra brassicae L. (Lepidoptera: Noctuidae). Insects were reared at three instar combinations and three host densities in closed containers with infected larvae. Insects were observed daily and the number of deaths and time to death were recorded. Levels of virus mortality were marginally higher in the containers where a higher density of hosts was introduced. Larvae appeared to have a greater risk of infection when late instar combinations were used. Final levels of mortality of older larvae were significantly higher than those of younger larvae. Mean times to death of larval populations were longer...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epizootiology; Nucleopolyhedrovirus; Cabbage moth; Host density; Biological control.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000300007
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Mortality of Plutella xylostella larvae treated with Aspidosperma pyrifolium ethanol extracts PAB
Trindade,Roseane Cristina Prédes; Silva,Paulo Pedro da; Araújo-Júnior,João Xavier de; Lima,Ivanildo Soares de; Paula,José Elias de; Sant'Ana,Antônio Euzébio Goulart.
The objective of this work was to assess the effects of Aspidosperma pyrifolium ethanol extracts on cabbage moth (Plutella xylostella) larvae. The ethanol extracts of the stem bark, fruits and roots of A. pyrifolium were obtained by classical phytochemical methods, and the resulting subfractions were tested on P. xylostella, using 4 and 5 mg L-1. The crude ethanol extract of the stem bark was more lethal. The alkaloid-rich aqueous subfraction derived from the stem bark extract caused 100% larval mortality at 4 mg L-1. Insecticidal activity was associated with the presence of the monoterpenoid indole alkaloids aspidofractinine, 15-demethoxypyrifoline, and N-formylaspidofractinine. These alkaloids presented excellent insecticidal properties against P....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alkaloids; Cabbage moth; Insecticidal activity; Organic extracts; Pereiro-do-sertão.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001200024
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