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cides on the horizon to replace Heptachlor? A - Research has not come up with such a mater ial which can be substituted for Heptachlor in fertilizer or in granular form for the fall treatment. In as much as Heptachlor is a chlorinated hydrocarbon, it is assumed that other similar insecticides — dieldrin for example — will eventually fail to control the alfalfa weevil. For these reasons, stress will be on the use of organic phosphates or carbamates for spring spray treatments -- using suchinsecti
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