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Barreto,Marliton R.; Guimaraes,Cláudia T.; Teixeira,Flávia F.; Paiva,Edilson; Valicente,Fernando H.. |
The total of 22 Baculovirus isolates surveyed in different corn producing regions in Brazil were used against fall armyworm, Spodoptera frugiperda (J.E. Smith). The viruses were purified and their suspensions were used to feed fall armyworm larvae from 4th and 5th instar. The mortality rate was checked daily and the infected larvae were frost after death, what generally occurred between the 5th and 7th day after virus ingestion. The 22 Baculovirus isolates were used in six concentrations (from 10³ to 10(8) polyhedra/ml) and one check treatment with water. Mortality rate, larval period, pupal period, pupa weight and lethal concentration (LC50) were determined for all isolates. Significant differences were found among all isolates and different... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insect pathology; Fall armyworm larvae; PCR. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000100010 |
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Barreto,Marliton R.; Anjos,Norivaldo; Della Lucia,Terezinha M. C.. |
Spermologus rufus Boheman (Coleoptera: Curculionidae) is an insect which attacks cacao nuts, oleaginous pits and Araucaria angustifolia (Bert.) Kuntze seeds. In this study the reproductive behavior of S. rufus was investigated to provide useful knowledge to support control measures of this insect. Research was carried out under laboratory conditions. Twenty-two couples of newly emerged adults were individualized in Wheaton flasks containing A. angustifolia seeds for oviposition and feeding. Mating was observed every day until the insects died. Females oviposited in the seeds; 80.4% of these seeds had only one egg. Eggs were mostly found in the median and more enlarged region of the seed and at the insertion point. Pre-oviposition period was, on average,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Courtship oviposition. |
Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591999000200022 |
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