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Nature volume 150, page 90 (18 July 1942) | Download Citation



A SHORT paper by G. Fox-Wilson (J. Roy. Hort. Soc., 67, Pt. 6 ; June, 1942) reviews the horticultural significance and control of aphids. Eradication of these pests is often difficult, and one of the reasons is discussed in the paper. Viviparous stem mothers, when subjected to certain contact insecticides, often remain in a comatose state before death actually occurs, but living nymphs are often produced in this condition. Spraying with nicotine is the best control, but Derris and Pyrethrum washes should be employed where the plant parts attacked are to be used for food.

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