Application of Nitrogen Fertilizer to Control Anthracnose of Black Walnut

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Abstract
N fertilizers enhanced the resistance of J. nigra to walnut anthracnose incited by Gnomonia leptostyla and delayed premature defoliation. Application rates were directly correlated with foliar color and tree growth and inversely correlated with disease severity. (NH4)2SO4, NH4NO3 and urea were equally efficient sources of N. Both April and June applications of N were effective. The addition of P and K often diminished the effectiveness of N.

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