Resistência a inseticidas em populações de percevejo-do-colmo do arroz Tibraca limbativentris (hemiptera: pentatomidae)
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2016-09-13
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Universidade Federal de Goiás
Resumo
The increase in insecticide application for control the rice stalk stink bug Tibraca limbativentris
Stal (Hemiptera: Pentatomidae) in irrigated rice in Brazil, has been reported by producers as
responsible for loss of effectiveness of some insecticides commonly used to manage this insect and
this is the base of this investigation. The insecticides used in this study were: bifenthrin,
carbosulfan, etophenprox, λ-cyhalothrin, and thiametoxam. Six populations of insects were
collected in producing areas of the states of Tocantins, Goiás and Santa Catarina, Brazil. Insect
adults of each population were submitted to discriminant concentrations (LC95s) previously
determined for the population collected in natural habitat in Santo Antônio de Goiás, and used as
standard susceptible population. The frequency of individuals resistant in the population of
Formoso do Araguaia was 76% for carbosulfan, 86% for bifenthrin, 72% for etofenprox, 80% for
L-cyalothrin, and 80% for thyamethoxam. Although the frequencies of resistant individuals can be
considered low to moderate, it is first report of resistance of T. limbativentris to insecticides.
These results indicate the resistance development to other insecticides with different mode of
actions, with emphasis to the stink bug populations of Formoso do Araguaia-TO. These results also
indicates a possible occurrence of crossed a resistance or multiple in that population.
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MACIEL, D. N. Resistência a inseticidas em populações de percevejo-do-colmo do arroz Tibraca limbativentris (hemiptera: pentatomidae). 2016. 45 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2016.