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Insecticide resistance monitoring and sublethal effects of an insect growth regulator on tarnished plant bug (Hemiptera: Miridae)Catchot, Beverly D. 30 April 2021 (has links)
Efforts to implement integrated pest management (IPM) strategies and improving our understanding of existing strategies are keys to achieving adequate control of tarnished plant bug, Lygus lineolaris. Insecticide applications are a part of IPM and monitoring their efficacy is critical for producers to remain profitable. Resistance to imidacloprid, thiamethoxam, and sulfoxaflor was documented, although there continues to remain variability among populations within the region. The insect growth regulator, novaluron, although only lethal to nymphs, plays an important role in management of Lygus. Sublethal impacts to adult plant bugs may be an important factor in reducing populations within the growing season. Future research to confirm the validity of using a laboratory colony as a baseline for insecticide susceptibility is needed to account for increased vigor of insects reared on artificial diet.
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Resistência a inseticidas em populações de percevejo-do-colmo do arroz Tibraca limbativentris (hemiptera: pentatomidae) / Resistance to insecticides in populations in rice stalk stink bug Tibraca limbativentris (Hemiptera: Pentatomidae)Maciel, Diogo Nery 13 September 2016 (has links)
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Previous issue date: 2016-09-13 / 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. / O aumento no uso de inseticidas para o controle do percevejo-do- colmo Tibraca limbativentris
Stal 1860 (Hemiptera: Pentatomidae) em lavouras de arroz irrigado no Brasil, associado a relatos
de produtores sobre perda de eficácia dos produtos comumente usados, embasaram a condução
desta investigação sobre a possível ocorrência de resistência aos inseticidas: bifentrina,
carbosulfan, etofenproxi, lambda-cialotrina e tiametoxan. As populações de insetos foram
coletadas em seis áreas de produção de arroz irrigado nos estados de Tocantins, Goiás e Santa
Catarina, Brasil. Insetos adultos destas populações foram estabelecidos em gaiolas teladas de
criação em casa de vegetação e em laboratório foram submetidos a concentrações discriminantes
(LC 95 s) estimadas para a população de Santo Antônio de Goiás, coletada em ambiente natural e
usada como população-padrão de susceptibilidade. As frequências de mortalidade de indivíduos
para a população de Formoso do Araguaia foi de 76% para o inseticida carbosulfan, 86% para
bifentrina, 72% para etofenproxi, 80% para L-cialotrina e de 80% para o inseticida tiametoxan.
Embora as frequências de indivíduos resistentes encontradas sejam consideradas de baixas a
moderadas, trata-se do primeiro registro de T. limbativentris resistentes a inseticidas e, já se
percebe a extensão do problema com relação ao desenvolvimento de resistência a produtos de
diferentes grupos e modos de ação, principalmente na região produtora de Formoso do Araguaia-
TO. Os resultados desta pesquisa indicam uma possível ocorrência de resistência cruzada ou
múltipla nessa população.
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Monitoring der Resistenzentwicklung des Maiszünsler (Ostrinia nubilalis), Hübner) gegenüber Bt-Mais / Monitoring of European corn borer (Ostrinia nubilalis>, Hübner) resistance to Bt-cornMeise, Thomas 06 November 2003 (has links)
No description available.
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