Management of mirids with reduced rate of chemical plus additive - a case study

Date Issued:2008-08-10

Abstract

Australian cotton, with the increasing adoption of Bollgard II, has been experiencing elevated levels of mirid infestation for the last few seasons. To manage this pest, the only available option is chemical intervention. During the 2007/8 cotton season, between 2 and 4 sprays were required to manage mirids in the different valleys. Researchers in Australia found that mixing additives with insecticides increased mortality to the target pests (Khan et al. 2002; Khan 2003 & Mensah et al. 2005). One such additive is table salt (NaCl). Previous studies showed that mixing table salt with insecticide allowed the chemical rate to be reduced by 70% without compromising efficacy and also reduced the impact on beneficials. Adoption of this technology in the Australian cotton industry is encouraging. However, some confusion exists among consultants and growers regarding the effectiveness of this technology. A large scale trial involving a consultant and a grower was conducted to verify this technology.

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