residual effect of pesticide
灭幼脲以其独特的杀虫方式，及其广谱、高效、低毒、低成本、残效期长等优点，被誉为“绿色农药”。
DFB is called "green pesticide" with the characters:individual mode of action, broad spectrum, high performance, hypovirulence, low cost, long residual efficient duration.
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