Suscetibilidade de populações de tripes a inseticidas e efeito da utilização de espinosina, piretroide e sulfoxamina em Caliothrips phaseoli (Hood) (Thysanoptera: Thripidae) na cultura da soja
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Data
2021-07-30
Autores
Souza, Suyanne Araújo de [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Caliothrips phaseoli (Hood) (Thysanoptera: Thripidae) faz parte de um grupo de espécies de tripes que são conhecidas por sua capacidade de colonizar diversas plantas. Seu curto ciclo de vida, a severidade de seus danos devido ao hábito alimentar, bem como a capacidade de transmitir viroses os tornam sérias pragas. Apesar de ser considerada praga secundária na cultura da soja, C. phaseoli possui potencial de causar danos nessa cultura. O manejo desse inseto-praga é realizado quase que exclusivamente com inseticidas e, no Brasil, não há diversidade de ingredientes ativos registrados. Dessa forma, é essencial conhecer a suscetibilidade desta praga aos produtos comerciais e implementar programas de monitoramento. O estudo buscou traçar as curvas de suscetibilidade para os ingredientes ativos mais utilizados no controle de C. phaseoli e avaliar o efeito da aplicação dos inseticidas registrados para lagartas na flutuação populacional de C. phaseoli. No primeiro experimento, foram realizados testes de suscetibilidade em tripes adultos, e no segundo, ensaios em condições de campo, a fim de avaliar o efeito da aplicação de inseticidas e do estágio fenológico da soja na flutuação populacional dos tripes. Os ingredientes ativos acefato, acetamipride, cloridrato de formetanato, espinetoram, imidaclopride e lambda-cialotrina foram testados em duas populações. A suscetibilidade, entre as populações, variou quando utilizados alguns ingredientes ativos. Em campo, a pulverização de espinosina, piretroide e sulfoxamina reduziu a população de ninfas e de adultos até, em média, o décimo dia após aplicação. O pico populacional de adultos foi observado no estágio R1. A partir dos resultados obtidos, conclui-se que foram realizados experimentos para avaliar a relação dos diferentes níveis de suscetibilidade entre as populações testadas em laboratório, o efeito da aplicação de inseticidas registrados para lagartas na supressão populacional e a influência do estágio fenológico da soja na ocorrência de picos populacionais de tripes.
Caliothrips phaseoli (Hood) (Thysanoptera: Thripidae) is part of a group of thrips species that are known for their ability to colonize many plants. Their short life cycle, the severity of their damage due to eating habits, as well as the ability to transmit viruses make them serious pests. Despite being considered a secondary pest in the soybean crop, C. phaseoli has the potential to cause damage to this crop. The management of this insect pest is carried out almost exclusively with insecticides and, in Brazil, there is no diversity of active ingredients registered. Therefore, it is essential to know the susceptibility of this pest to commercial products and implement monitoring programs. The study aimed to trace the susceptibility curves for the active ingredients most used in the control of C. phaseoli and to evaluate the effect of the application of registered insecticides for caterpillars on the population fluctuation of C. phaseoli. In the first experiment, susceptibility tests were carried out on adult thrips, and in the second, tests under field conditions, in order to evaluate the effect of the application of insecticides and the phenological stage of soybean on the population fluctuation of thrips. The active ingredients acephate, acetamiprid, formetanate hydrochloride, spinetoram, imidacloprid and lambda-cyhalothrin were tested in two populations. The susceptibility among populations varied when some active ingredients were used. In the field, the spraying of spinosine, pyrethroid and sulfoxamine reduced the population of nymphs and adults until, on average, the tenth day after application. The adult population peak was observed at stage R1. From the results obtained, it is concluded that experiments were carried out to evaluate the relationship of different levels of susceptibility between populations tested in the laboratory, the effect of the application of insecticides registered for caterpillars on population suppression and the influence of the phenological stage of soybean on occurrence of thrips population peaks.
Caliothrips phaseoli (Hood) (Thysanoptera: Thripidae) is part of a group of thrips species that are known for their ability to colonize many plants. Their short life cycle, the severity of their damage due to eating habits, as well as the ability to transmit viruses make them serious pests. Despite being considered a secondary pest in the soybean crop, C. phaseoli has the potential to cause damage to this crop. The management of this insect pest is carried out almost exclusively with insecticides and, in Brazil, there is no diversity of active ingredients registered. Therefore, it is essential to know the susceptibility of this pest to commercial products and implement monitoring programs. The study aimed to trace the susceptibility curves for the active ingredients most used in the control of C. phaseoli and to evaluate the effect of the application of registered insecticides for caterpillars on the population fluctuation of C. phaseoli. In the first experiment, susceptibility tests were carried out on adult thrips, and in the second, tests under field conditions, in order to evaluate the effect of the application of insecticides and the phenological stage of soybean on the population fluctuation of thrips. The active ingredients acephate, acetamiprid, formetanate hydrochloride, spinetoram, imidacloprid and lambda-cyhalothrin were tested in two populations. The susceptibility among populations varied when some active ingredients were used. In the field, the spraying of spinosine, pyrethroid and sulfoxamine reduced the population of nymphs and adults until, on average, the tenth day after application. The adult population peak was observed at stage R1. From the results obtained, it is concluded that experiments were carried out to evaluate the relationship of different levels of susceptibility between populations tested in the laboratory, the effect of the application of insecticides registered for caterpillars on population suppression and the influence of the phenological stage of soybean on occurrence of thrips population peaks.
Descrição
Palavras-chave
Thysanoptera, Suscetibilidade, Eficácia de controle, Flutuação populacional, Susceptibility, Control effectiveness, Population fluctuation