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EFFECT OF THURINGIENSIN ON CUTICLE DEVELOPMENT OF IMMATURE STAGES OF Tetranychus urticae Koch. (ACARINA: TETRANYCHIDAE) Agricultura Técnica
Vargas,Robinson; Chapman,Bruce; Penman,David R..
The effect of thuringiensin on the ultrastructure of Tetranychus urticae Koch cuticle was studied using an transmission electron microscope (TEM). Thuringiensin was found to affect epicuticle synthesis in larvae, protonymphs and deutonymphs. Its disruptive effects on larval cuticle formation were observed from 12 h onwards, indicating that the effect of the exposure time of mites to thuringiensin is related to the stage of cuticle development. The results suggest that the effects of thuringiensin occur in a relatively short time.
Tipo: Journal article Palavras-chave: Thuringiensin; B -exotoxin; Cuticle; Thuringiensin; B -exotoxin.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200003
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FACTORS INFLUENCING THE RESPONSES OF Tetranychus urticae Koch (ACARINA: TETRANYCHIDAE) TO THURINGIENSIN Agricultura Técnica
Vargas,Robinson; Chapman,Bruce; Penman,David R..
The effects of temperature, host plant, active ingredient mobility, surfactant, residue age and larval age on the response of Tetranychus urticae Koch to thuringiensin were evaluated in laboratory bioassays. T. urticae larvae were significantly more susceptible to thuringiensin at 13°C than at 28°C. A significantly different response of T. urticae larvae to thuringiensin residues was found on peach and apple leaves. Older T. urticae larvae were significantly more susceptible than younger larvae when exposed to thuringiensin residues. No systemic or translaminar effects of thuringiensin were detected; the leaf surface (upper or lower) and the addition of Silwet L-77 surfactant did not affect the efficacy of thuringiensin. The use of thuringiensin in spider...
Tipo: Journal article Palavras-chave: Beta -exotoxin; Miticide; Bioassay; Pesticide; Residue age; Surfactant; Translocation.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000100001
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TOXICITY OF THURINGIENSIN ON IMMATURE AND ADULT STAGES OF Tetranychus urticae KOCH AND Panonychus ulmi (KOCH) (ACARINA: TETRANYCHIDAE) Agricultura Técnica
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
Registros recuperados: 3
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