Comparison of Different Vaporizers for the Evaluation of Pesticide Efficacy in Tobacco Field

In order to improve pesticide efficacy in tobacco field, three vaporizers for the evaluation of pesticide spray distribution were compared using food dye of Allura Red as tracer. The results indicated that, the absorbance peak for Allura Red at 501nm. In sunlight after 2-6 hours, the decomposition rates were between 2.1%-3.4%, so that it is stable in sunlight. The recovery rates on tobacco and glasses were very high, so it is quite feasible as tracer to measure the pesticide spray distribution of volume spay. Compared to hand sprayer, spray volume reduced 20% by using electrostatic spray, and effective utilization rate increased 0.8 times. Adding Silwet the effective utilization rate increased by 1.07 to 1.19 times. The field application showed that after 7 d the corrected control efficacy to Myzus persicae were more than 97% .