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1973•The Canadian EntomologistRequires access

THE EFFECT OF EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE), INFESTATIONS ON N, P, AND K CONCENTRATIONS IN APPLE FOLIAGE THROUGHOUT THE SEASON

Horst Herbert, K. P. Butler

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Abstract

Abstract Seasonal trends of the percentage of nitrogen, phosphorus, and potassium were measured in the foliage of apple trees infested with the European red mite, Panonychus ulmi (Koch), at four population levels created by the action of predators and/or chemical treatment. It was shown that by early September the concentrations of these nutrients; particularly nitrogen, were significantly depressed by high P. ulmi populations.

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Abstract Seasonal trends of the percentage of nitrogen, phosphorus, and potassium were measured in the foliage of apple trees infested with the European red mite, Panonychus ulmi (Koch), at four population levels created by the action of predators and/or chemical treatment. It was shown that by early September the concentrations of these nutrients; particularly nitrogen, were significantly depressed by high P. ulmi populations.

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Available abstract

Abstract Seasonal trends of the percentage of nitrogen, phosphorus, and potassium were measured in the foliage of apple trees infested with the European red mite, Panonychus ulmi (Koch), at four population levels created by the action of predators and/or chemical treatment. It was shown that by early September the concentrations of these nutrients; particularly nitrogen, were significantly depressed by high P. ulmi populations.

Key concepts: Panonychus ulmi, Mite, Biology, Population, Horticulture, Acaricide, Phosphorus, Predation

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THE EFFECT OF EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE), INFESTATIONS ON N, P, AND K CONCENTRATIONS IN APPLE FOLIAGE THROUGHOUT THE SEASON — Research Paper | ScholarLens