Control of Grape Downy Mildew by 60% Mixture of Frostweed and Metalaxil （Aqueous Solution）

CAO Yahui; LU Haibo; ZHU Xiuhao; SHI Zhanhai; WANG Daoying; JIAO Yinghu; ZHANG Hongjie

doi:10.15886/j.cnki.rdswxb.2019.03.011

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In order to clarify the effect of 60% mixture of Frostweed and Metalaxyl（aqueous solution） on grape downy mildew, recommended dosage, and uses, the solution of this fungicide was sprayed evenly thrice at an interval of 7—10 days on the lower surface of the leaves of the grapes at the young fruit stage, and the grape downy mildew was observed 10 days prior to harvesting. The results showed that the 60% mixture of Frostweed and Metalaxyl（aqueous solution） had control effects of 87.66 %, 85.79 % and 71.08 %, respectively at respective concentrations of 110,90 and 70 g·mu^-1（1/15 ha）, and the control had a control effect of 73.51 %. The 60% mixture of Frostweed andMetalaxyl（aqueous solution） had obvious effect on grape downy mildew at a concentration of 90 g·mu^-1 and is suitable for use in grape production.

Control of Grape Downy Mildew by 60% Mixture of Frostweed and Metalaxil （Aqueous Solution）

1. Hebei North University, Zhangjiakou, Hebei 075000;

2. Hailai Bureau of Forestry and Grassland, Zhangjiakou, Hebei 075000;

3. Hainan Boshiwei Agrochemical Co. Ltd, Haikou, Hainan 570100, China

Received Date: 2019-06-28

Key words:

60% mixture of Frostweed and Metalaxyl（aqueous solution） /
downy mildew /
efficacy /
test

Abstract: In order to clarify the effect of 60% mixture of Frostweed and Metalaxyl（aqueous solution） on grape downy mildew, recommended dosage, and uses, the solution of this fungicide was sprayed evenly thrice at an interval of 7—10 days on the lower surface of the leaves of the grapes at the young fruit stage, and the grape downy mildew was observed 10 days prior to harvesting. The results showed that the 60% mixture of Frostweed and Metalaxyl（aqueous solution） had control effects of 87.66 %, 85.79 % and 71.08 %, respectively at respective concentrations of 110,90 and 70 g·mu^-1（1/15 ha）, and the control had a control effect of 73.51 %. The 60% mixture of Frostweed andMetalaxyl（aqueous solution） had obvious effect on grape downy mildew at a concentration of 90 g·mu^-1 and is suitable for use in grape production.

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Control of Grape Downy Mildew by 60% Mixture of Frostweed and Metalaxil （Aqueous Solution）

doi: 10.15886/j.cnki.rdswxb.2019.03.011

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