Effect of gamma irradiation of gravid Tetranychus desertorum, T. urticae and Oligonychus ilicis (Trombidiformes: Tetranychidae) females on the viabilities and durations of F1 life stages
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2016
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Autores IPEN
ANDRE RICARDO MACHI
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Florida Entomologist
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The objective of the study was to evaluate—as an alternative phytosanitary treatment—the effects of gamma irradiation of gravid spider mite females
on the viabilities and durations of F1 eggs and deutonymphs. The study focused on Tetranychus urticae Koch, Tetranychus desertorum Banks and
Oligonychus ilicis (McGregor) (Trombidiformes: Tetranychidae). Each mite species was identified under a stereomicroscope, and individual female
mites of each species were each taken with a fine-tipped brush and transferred to a Petri dish—i.e., 1 female mite individualized per dish with 32
dishes per species. Each dish with a Tetranychus spp. female was provided with a jack bean (Canavalia ensiformis [L.] DC) (Fabales: Fabaceae) leaf,
and each dish with an O. ilicis female was provided with a coffee (Coffea arabica L.; Gentianales: Rubiaceae) leaf. Gravid female mites were irradiated
in a Gammacell 220 cobalt-60 source—dose rate 0.486 kGy/h—with doses of 0 (control), 100, 200, 300, and 400 Gy with 32 replications per mite
species. Evaluations were made every 24 h for 22 d after irradiation by counting the numbers of eggs, deutonymphs, and adults and by recording
the mortality in each stage. Statistical analyses were done with generalized linear models with either the quasi-binomial distribution or the Gaussian
distribution—as appropriate—for analyses of mortality rates and durations (d) of the F1 eggs and deutonymphs of the 3 mite species. A 3 × 5 factorial
experimental design was used in which factor A (3 levels) pertained to the species and factor B (5 levels) pertained to the 4 radiation doses plus
the control. For Factor B polynomial regressions of dose rates on biological effects were used. The results showed progressive decreases in egg and
deutonymph viabilities that were proportional with progressive increases in radiation doses. Against O. ilicis 200 Gy prevented all F1 neonates from
developing beyond the first instar. Against T. urticae and T. desertorum 300 Gy prevented all F1 neonates from developing beyond the first instar. Irradiation
of gravid females caused the durations of the F1 egg stage and the F1 deutonymph stage to be prolonged.
Como referenciar
MACHI, ANDRE R.; ARTHUR, VALTER; SARRIES, GABRIEL A.; PIEDADE, SONIA M. de S. Effect of gamma irradiation of gravid Tetranychus desertorum, T. urticae and Oligonychus ilicis (Trombidiformes: Tetranychidae) females on the viabilities and durations of F1 life stages. Florida Entomologist, v. 99, p. 186-190, 2016. special issue 2. Disponível em: http://repositorio.ipen.br/handle/123456789/27180. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.