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Vargas,Robinson; Chapman,Bruce; Penman,David R.. |
The direct and residual toxicity of thuringiensin on different stages of Tetranychus urticae Koch and Panonychus ulmi (Koch), and the influence on T. urticae reproduction and population development were evaluated in laboratory bioassays. Direct toxicity was higher than residual toxicity to T. urticae for all life stages. Immature stages of T. urticae and P. ulmi were more susceptible to thuringiensin than adults. P. ulmi was more susceptible to thuringiensin than T. urticae. Fecundity of T. urticae was significantly reduced when females were exposed to residues for 2 days. Complete suppression of T. urticae population development was achieved when the F1 generation was exposed to thuringiensin residues, however, the level of suppression was concentration... |
Tipo: Journal article |
Palavras-chave: Beta -exotoxin; Miticide; Direct toxicity; Residual toxicity; Bioassay. |
Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072001000100001 |
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Tello,Víctor; Vargas,Robinson; Araya,Jaime; Cardemil,Antonieta. |
The postembryonic development, consumption and life table parameters of Cydnodromus picanus Ragusa and Phytoseiulus persimilis (Athias-Henriot) were studied at 29.44 ± 1.47 °C and 42.35 ± 5.01% of RH with a photoperiod of 14:10 h (L:D) in order to evaluate the potential of these predators for feeding on the carmine spider mite Tetranychus cinnabarinus (Boisduval). Eggs, larvae and protonymphs of T cinnabarinus may be optimal food for C. picanus, which obtained survival rates of 100%, 97% and 93%, respectively, on them. The survival of P persimilis was around 6.7% with diets based on eggs, larvae and protonymphs, showing a high mortality level by dehydration when fed with eggs. The time of the postembryonic development was significantly shorter (p <... |
Tipo: Journal article |
Palavras-chave: Biological control; Life table; Postembryonic development; Predation. |
Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200012 |
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