Effects of Different N-Fertilizers and Concentrations on Adelges cooleyi Populations

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Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. seedlings treated with 56–112 kg/ha of N-fertilizers had significantly fewer Cooley spruce gall aphids than trees with higher treatments; (NH4)2 SO4 treatments had less aphids than other N-forms, and controls.

Document Type: Research Article

Publication date: August 1, 1977

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