Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (4): 666-674.doi: 10.3864/j.issn.0578-1752.2012.04.007

• PLANT PROTECTION • Previous Articles     Next Articles

Effects of Droplet Density and Droplet Size on Control Efficiency of Chlorantraniliprole Against Cnaphalocrocis medinalis (Guenée)

 XU  De-Jin, GU  Zhong-Yan, XU  Guang-Chun, XU  Xiao-Long, DONG  Yu-Xuan   

  1. 1.江苏省农业科学院植物保护研究所，南京 210014
  • Received:2011-05-04 Online:2012-02-15 Published:2012-01-11

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Abstract: 【Objective】 The objective of this study is to analyze the effect of spray droplet density and droplet size on the control efficiency of chlorantraniliprole against Cnaphalocrocis medinalis under the conditions of different doses, and to provide a scientific basis for efficient use of pesticides in rice field. 【Method】Volumetric application rate was simulated using an automatic drive spraying tower. The surfactant was added to ensure that the chlorantraniliprole solution at different concentrations could provide equivalent wetting and spreading capacity on the rice leaf. The droplet density collected on the water sensitive paper was measured using the image processing method. 【Result】The control efficiency could be improved significantly with the increase of droplet density when the chlorantraniliprole dose was about 2.00 mg•m-2. When the dose was increased to 4.00 mg•m-2 and the droplet density of VMD 200 μm and VMD 75 μm were 26.06 and 66.96 droplets/cm2 respectively, the control efficiency was quite with the higher droplet density treatments. When the droplet density of VMD 200 μm reached 82.09 droplets/cm2, the control efficiency was not reduced with the dose from 4 mg•m-2 to 2 mg•m-2. Likewise, when the droplet density of VMD 75 μm reached 140.06 droplets/cm2, the control efficiency was not reduced with the dose decreased from 4.00 mg•m-2 to 2.50 mg•m-2. Spraying of chlorantraniliprole solution with the same carrier volume and concentration, VMD 75 μm nozzle increased the droplets density and improved the control effects. 【Conclusion】 Droplet density was closely related to the control efficiency of chlorantraniliprole against Cnaphalocrocis medinalis when the effective dose was relatively low. When the droplet density reached a certain quantity, the desired effect could still be obtained when the effective dose was decreased. During low spray volume, the control efficiency could be improved by decreasing droplet size which increased droplet density.

Key words: chlorantraniliprole, Cnaphalocrocis medinalis (Guenée), surface tension, dose, droplet density, droplet size

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