volumes de calda e pontas de pulverização no controle químico de spodoptera frugiperda na cultura do sorgo forrageiro spray volume and spray nozzle effects on chemical control of spodoptera frugiperda in fodder sorghum

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ID: 154924
2010
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Abstract
No manejo de Spodoptera frugiperda na cultura do sorgo, a utilização de inseticida ainda é a principal tática recomendada, contudo este método de controle precisa ser otimizado. O presente trabalho teve como objetivo avaliar o efeito da utilização de três pontas e dois volumes de calda na aplicação de inseticida para o controle químico de Spodoptera frugiperda na cultura do sorgo. O ensaio foi conduzido no delineamento em blocos ao acaso, com quatro repetições, em esquema fatorial (3 x 2) + 1: três tipos de pontas de pulverização (jato cônico vazio, jato plano defletor duplo e jato plano defletor com indução de ar), dois volumes de calda (200 e 130 L ha-1) e um tratamento adicional que não recebeu inseticida. Realizou-se a semeadura direta de uma cultivar de sorgo forrageiro, avaliando-se, após a aplicação do inseticida clorpirifós, a deposição de calda no dossel da cultura, o controle de Spodoptera frugiperda e a produtividade. Pôde-se concluir que as pontas de jato plano defletor duplo e jato plano defletor com indução de ar proporcionaram maior cobertura do dossel das plantas de sorgo do que a ponta de jato cônico, resultando em maior eficácia de controle de Spodoptera frugiperda e maior produtividade. O volume de calda de 200 L ha-1; quando comparado ao volume de 130 L ha-1; também proporcionou melhor eficácia de controle.
In the management of Spodoptera frugiperda in sorghum, the insecticide use is the main tool recommended, but this method needs to be optimized. The objective of this work was to evaluate the spray volume and spray nozzle effects on chemical control of Spodoptera frugiperda in sorghum. A randomized complete-block design with four replications was used, in a factorial model (3 x 2) + 1: three spray nozzles (hollow cone, turbo twin flat-fan and air induction turbo flat-fan), two spray volumes (200 and 130 L ha-1) and the control (non-treated plot). Fodder sorghum was sown and after the application of the insecticide chlorpirifos, the spray deposition in the plant canopy, the Spodoptera frugiperda control, and the yield were evaluated. The results showed that the turbo twin flat-fan and the air induction turbo flat-fan nozzles provided better canopy coverage than the hollow cone, resulting in a good control of Spodoptera frugiperda and increase of yield. The spray volume of 200 L ha-1 when compared to the 130 L ha-1 propitiated also better control.
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cunha2010engenhariavolumes Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors João P. A. R. Da Cunha, Ademilson D. Da Silva Júnior
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Journal bioorganic and medicinal chemistry letters
Year 2010
DOI
10.1590/S0100-69162010000400013
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162010000400013
Keywords
sorghum bicolor fall armyworm

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