DDT及BHC殺蟲藥劑對西瓜葉的毒害

The toxic effects of DDT and BHC dusts to the leaves of watermelon

Since the prehistoric times, insect pest has been one of those very serious problems of human-beings. But as our scientific knowledge is increasing day by day, changes have been brought about in our living mode. The cultivated plants which supply us with food, clothing and other daily needs, are generally damaged by various insect pests. In order to have a better harvest of our cultivated economic plants, we should get rid of those weedy vegetations, diseases, and insect pests as clear as possible. As human knowledge is increasing, the methods of controlling the insect pests are also improved. Of all the methods used to control pests, the insecticides are more frequently applied.