Author： Wool David
Publisher： Entomological Society of America
ISSN： 0013-8754
Source： Entomological Society of America. Bulletin, Vol.17, Iss.3, 1971-09, pp. : 133-135
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Abstract
In addition to its other evils, use of chemicals to control pest populations has created a problem limiting its effectiveness. Pest populations sometimes rather quickly develop resistance to insecticides, thereby rendering ineffective the attempts to prevent their damage to crops. Treatments, only last year extremely effective (95% kill and over), may kill hardly 50% of the pests this year, possibly less than that in years to come. Many such examples are cited by farmers and pest-control people in Israel, and similar problems exist wherever modern agriculture is practiced. Large sums of money used to buy and apply the poisons often practically go down the drain.
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