Chemically Induced Resistance in the Cotton Plant to Attack by the Boll Weevil

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Abstract
Investigations were conducted to determine whether resistance could be chemically induced in the cotton plant to attack by the boll weevil (Anthonomus grands Boheman). Plant extracts representing 117 families and 358 species and 400 fermentation filtrates representing a wide spectrum of bacteria, molds, yeasts, and fleshy fungi were screened against the boll weevil cotton plant complex for systemically induced repellency, attractancy, and effects on fecundity and development or larvae in squares. The results obtained were negative. Nine compounds of known chemical identity were sereened and one or these, Bayer 39007 (O-isopropoxyphenyl methyl-carbamate), exhibited definite systemically induced repellency to the boll weevil in seedling cotton plants and in plants ill the 4-leaf stage in the laboratory.

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