So far, there are little better methods other than application of chemical pesticides for the control of the aphid.
目前对它的防治主要依靠化学农药，其他防治方法应用很少，从而带来了一系列的负面影响。
The average application equates to about 16 pounds of chemical pesticides per person every year.
这相当于每人每年约平均使用16磅的化学农药。
In addition, the factors of contamination of pesticides in environment were also discussed, based on the toxicity, physico-chemical properties and application of pesticides, and environment…
并从农药的毒性、理化性质、使用状况及相应的环境条件等方面分析了农药污染环境的因素。
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