Controle de Spodoptera frugiperda em milho por tratamento de sementes
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Data
2019-07-12
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Universidade Federal de Viçosa
Resumo
Neste trabalho avaliou-se o potencial de controle populacional de Spodoptera frugiperda (Lepidoptera: Noctuidae) com inseticidas em tratamento de sementes para proteção de plantas de milho, considerando o hábito fitófago das larvas e o tempo após emergência das plantas de milho. Em casa de vegetação, os resultados dos experimentos mostraram que todos os inseticidas testados (ciantraniliprole, clorantraniliprole e tiodicarbe+imidaclopride) causaram mortalidade de larvas de 3º instar superior a 80% do 1º ao 11º dia após a emergência das plantas e protegeram-nas contra injúrias das lagartas advindas de infestação no cartucho. Resultado semelhante foi obtido para larvas de 5º ínstar (hábito de lagarta rosca), das quais os inseticidas, entre 2 e 8 dias após a emergência das plantas, causaram mortalidade acima de 80% e protegeram contra injúria das lagartas que se alimentaram na base da planta. Esses resultados indicam que o uso de tratamento de sementes com inseticida da classe diamida (ciantraniliprole, clorantraniliprole) ou carbamato + neonicotinoide (tiodicarbe + imidaclopride) deve proteger as plantas de milho contra injúrias de larvas de S. frugiperda advindas de ovos ou residentes na área de cultivo, durante, respectivamente, 11 ou 8 dias após emergência da cultura. Os resultados desta pesquisa auxiliarão na escolha de táticas de controle de S. frugiperda, espécie de grande importância econômica nas Américas, onde é nativa, e na África e Ásia, onde é invasora e de grande interesse quarentenário em alguns países. Palavras-chave: lagarta do cartucho; Zea mays; sistêmico; eficácia, período 30 residual
The fall armyworm (Spodoptera frugiperda, Lepidoptera: Noctuidae), is a species of great economic importance in the Americas, where it is native, and in Africa and Asia, where it is invasive and a quarantine pest of great concern. This study assessed the potential for control of fall armyworm in corn using insecticides in seed treatment, considering the larval feeding behavior and the residual time after plant emergence. In the greenhouse, all insecticides tested (cyantraniliprole, clorantraniliprole and thiodicarb + imidacloprid) caused over 80% mortality of third-instar larvae from the 1 st to the 11 th day after plant emergence and protected them against the larval injury when infestation occurred in the corn whorl. For 5 th- instar larvae infested on the stalk basis of corn plants (simulating the cutworm feeding behavior of the fall armyworm), larval mortality over 80% and plant protection were obtained with all the insecticides tested from the 2 nd to the 10 th day after plant emergence. These results indicate that the use of seed treatment with a diamide (cyantraniliprole, clorantraniliprole) or a carbamate+neonicotinoid insecticide (thiodicarb + imidacloprid) can protect corn plants during 11 and 8 days after emergence against fall armyworm larvae originating from eggs or from resident larvae coming from the cultivation area. The results of this research will help in the selection of efficacious control tactics for fall armyworm in regions where it is a native or an invasive species. Keywords: fall armyworm; Zea mays; systemic; efficacy; residual period
The fall armyworm (Spodoptera frugiperda, Lepidoptera: Noctuidae), is a species of great economic importance in the Americas, where it is native, and in Africa and Asia, where it is invasive and a quarantine pest of great concern. This study assessed the potential for control of fall armyworm in corn using insecticides in seed treatment, considering the larval feeding behavior and the residual time after plant emergence. In the greenhouse, all insecticides tested (cyantraniliprole, clorantraniliprole and thiodicarb + imidacloprid) caused over 80% mortality of third-instar larvae from the 1 st to the 11 th day after plant emergence and protected them against the larval injury when infestation occurred in the corn whorl. For 5 th- instar larvae infested on the stalk basis of corn plants (simulating the cutworm feeding behavior of the fall armyworm), larval mortality over 80% and plant protection were obtained with all the insecticides tested from the 2 nd to the 10 th day after plant emergence. These results indicate that the use of seed treatment with a diamide (cyantraniliprole, clorantraniliprole) or a carbamate+neonicotinoid insecticide (thiodicarb + imidacloprid) can protect corn plants during 11 and 8 days after emergence against fall armyworm larvae originating from eggs or from resident larvae coming from the cultivation area. The results of this research will help in the selection of efficacious control tactics for fall armyworm in regions where it is a native or an invasive species. Keywords: fall armyworm; Zea mays; systemic; efficacy; residual period
Descrição
Palavras-chave
Lagarta-do-cartucho, Zea mays, Milho - Semente - Doenças e pragas - Controle
Citação
PINTO, Braullio de Siqueira. Controle de Spodoptera frugiperda em milho por tratamento de sementes. 2019. 27 f. Dissertação (Mestrado em Defesa Sanitária Vegetal) - Universidade Federal de Viçosa, Viçosa. 2019.