Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)

Insecticides may cause mortality and deleterious effects on predatory stinkbugs. For this reason, the effect of five concentrations of permethrin applied on third instar nymphs of Supputius cincticeps (Stål) (Heteroptera: Pentatomidae) was investigated on ovary activation in this predator. The nymph...

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Main Authors: W. P. Lemos, R. S. Medeiros, J. C. Zanuncio, J. E. Serrão
Format: Article
Language:English
Published: Instituto Internacional de Ecologia
Series:Brazilian Journal of Biology
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842005000200012&lng=en&tlng=en
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spelling doaj-15f66686aad6442a946a59ba158737f42020-11-25T01:20:27ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-437565228729010.1590/S1519-69842005000200012S1519-69842005000200012Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)W. P. Lemos0R. S. Medeiros1J. C. Zanuncio2J. E. Serrão3Universidade Federal de ViçosaUniversidade Federal de ViçosaUniversidade Federal de ViçosaUniversidade Federal de ViçosaInsecticides may cause mortality and deleterious effects on predatory stinkbugs. For this reason, the effect of five concentrations of permethrin applied on third instar nymphs of Supputius cincticeps (Stål) (Heteroptera: Pentatomidae) was investigated on ovary activation in this predator. The nymphs received topical application of permethrin in the following concentrations (mg a.i./ml): 10-7, 10-6, 10-5, 10-4, and 10-3. Ovary lengths and oocyte numbers were quantified following first egg mass. Ovary length of S. cincticeps varied from 5.7 mm with 10-4 mg a.i./ml, to 6.4 mm with 10-7 mg a.i./ml, with similar values for the other permethrin concentrations and for the control. The number of oocytes per female varied from 13.5 with 10-3 mg a.i./ml, to 29.2 for the control, with significant differences.The number of oocytes per female of nymphs exposed to a permethrin concentration of 10-5 mg a.i./ml was similar to that of the control.However, the lower number of oocytes per female from nymphs exposed to other concentrations of permethrin suggests that this insecticide may affect the reproductive capacity of this predator. The results obtained are discussed in relation to tolerance of Heteroptera predators to insecticides and possible hormesis occurrence.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842005000200012&lng=en&tlng=enhormesisinsecticide insect tolerancereproduction
collection DOAJ
language English
format Article
sources DOAJ
author W. P. Lemos
R. S. Medeiros
J. C. Zanuncio
J. E. Serrão
spellingShingle W. P. Lemos
R. S. Medeiros
J. C. Zanuncio
J. E. Serrão
Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
Brazilian Journal of Biology
hormesis
insecticide insect tolerance
reproduction
author_facet W. P. Lemos
R. S. Medeiros
J. C. Zanuncio
J. E. Serrão
author_sort W. P. Lemos
title Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
title_short Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
title_full Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
title_fullStr Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
title_full_unstemmed Effect of sub-lethal concentrations of permethrin on ovary activation in the predator Supputius cincticeps (Heteroptera: Pentatomidae)
title_sort effect of sub-lethal concentrations of permethrin on ovary activation in the predator supputius cincticeps (heteroptera: pentatomidae)
publisher Instituto Internacional de Ecologia
series Brazilian Journal of Biology
issn 1678-4375
description Insecticides may cause mortality and deleterious effects on predatory stinkbugs. For this reason, the effect of five concentrations of permethrin applied on third instar nymphs of Supputius cincticeps (Stål) (Heteroptera: Pentatomidae) was investigated on ovary activation in this predator. The nymphs received topical application of permethrin in the following concentrations (mg a.i./ml): 10-7, 10-6, 10-5, 10-4, and 10-3. Ovary lengths and oocyte numbers were quantified following first egg mass. Ovary length of S. cincticeps varied from 5.7 mm with 10-4 mg a.i./ml, to 6.4 mm with 10-7 mg a.i./ml, with similar values for the other permethrin concentrations and for the control. The number of oocytes per female varied from 13.5 with 10-3 mg a.i./ml, to 29.2 for the control, with significant differences.The number of oocytes per female of nymphs exposed to a permethrin concentration of 10-5 mg a.i./ml was similar to that of the control.However, the lower number of oocytes per female from nymphs exposed to other concentrations of permethrin suggests that this insecticide may affect the reproductive capacity of this predator. The results obtained are discussed in relation to tolerance of Heteroptera predators to insecticides and possible hormesis occurrence.
topic hormesis
insecticide insect tolerance
reproduction
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842005000200012&lng=en&tlng=en
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