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REPRODUCTION OF THE APHID MYZUS PERSICAE RELATED TO THE MINERAL NUTRITION OF POTATO PLANTS

The fecundity and reproduction rate of caged Myzus persicae on leaves of potato plants growing on nutrient solutions with different anion and cation ratios were measured. The levels of total and soluble N in the leaves and the reproduction rate were found to be positively correlated with the amounts of N in the nutrient solutions. Longevity and reproduction rate were considerably less on 4‐week‐old plants than on 8‐week‐old plants; this difference is not correlated with the total N or soluble N‐content of the leaves. When comparing aphid development on plants, daily variations in the amounts of N compounds in the leaves could provoke an erroneous basis for assessing the physiological condition of the host plant.