POPULATIONS OF TETRANYCHUS ATLANTICUS McG. (ACARINA: TETRANYCHIDAE) ON SOYBEAN SUPPLIED WITH VARIOUS LEVELS OF NITROGEN, PHOSPHORUS, AND POTASSIUM¹
1965
CANNON, W.N. Jr | CONNELL, W.A.
Populations of Tetranychus atlanticus McGregor, on detached leaf discs from soybean plants in sand culture were greatly influenced by the amount of supplied nitrogen. Two nutrient formulae were used in which the balance of the ions were quite different. Increasing the nitrogen in either formula increased the population. The effects of supplied phosphorus or potassium seemed to depend on the interrelationship of ions in the nutrient solution. Varying the phosphorus concentration in one formula did not alter the number of progeny of this species. A much higher concentration of phosphorus than the standard level in the second formula resulted in a higher population. Differences in mite population resulting from various concentrations of potassium were not significant. The age of the soybean leaf, as indicated by its position on the plant, was found to influence the number of progeny of this species, with larger populations developing on the younger leaves.
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