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

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

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.

H. Herbert | K. Butler

[1] K. Sanford,et al. THE INFLUENCE OF SPRAY PROGRAMS ON THE FAUNA OF APPLE ORCHARDS IN NOVA SCOTIA: XX. TRENDS AFTER ALTERING LEVELS OF PHYTOPHAGOUS MITES OR PREDATORS , 1970, The Canadian Entomologist.

[2] H. Herbert. LIMITS OF EACH STAGE IN POPULATIONS OF THE EUROPEAN RED MITE, PANONYCHUS ULMI , 1970, The Canadian Entomologist.

[3] D. Stewart,et al. Effects of Increasing the Nitrogen Level of Apple Leaves on Mite and Predator Populations , 1961, The Canadian Entomologist.

[4] C. Henderson,et al. Sampling technique for determining populations of the citrus red mite and its predators. , 1943 .