The Effect of Fertilizers on Chinch Bug Resistance in Sorghums

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Abstract
Atlas sorgo and Dwarf Yellow milo sorghum plants grown in 6-inch flower pots to which NaN03 fertilizer had been added were killed by chinch bugs (Blissus leucopterus) in less time than when no fertilizer was added. Plants of these 2 vars. that were fertilized with superphosphate usually lived longer than the checks after being infested with chinch bugs. Variable results were obtained when KC1 or combinations of fertilizers containing NaN03, superphosphate or KC1 was added. Plants growing in fertile soil without chem. fertilizer and in soil containing a high % of horse manure were more susceptible to chinch bug damage than the check plants growing in unfertilized sand. In field expts. with Atlas sorgo and Finney milo sorghums, resistance to chinch bug attack was consistently decreased by NaN03 and increased by superphosphate applied to the soil.

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