1. All pesticides, from the first widely used DDT to bacterial insecticide Bt, have gradually lost their effectiveness.
2. American farmers lose the same amount of crops each year as they did before the use of DDT.
3. Pests who can survive pesticides produce more adaptable young generations, which quickens the speed of evolution of pests.
4. In India, The number of some pests grew rapidly and became much more serious problems because their natural enemies were killed by pesticides.
5. Many farmers believe that it is possible to stop using pesticides without affecting their business.
6. Despite the unsatisfactory development, IPM programs have attracted growing attention in American agriculture.
7. IPM is and will be the only answer to the pesticides problems now and far in the future.
8. IPM stands for______.
9. In Indonesia four years after the ban on dozens of insecticides in 1986, the brown plant hopper problem______.
10. The numbers of species resistant to one or more pesticides in 1948 and today were
答案:
1. Y 2. N 3. Y 4. N 5. N 6. Y 7. NG
8. integrated pest management 9. faded away 10. 14 and more than 500
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