1. DANKS, H. V. (1987) Insect Dormancy: An Ecological Perspective. Biological Survey of Canada, Ottawa, 439 pp.
2. DE WILDE, J., W. BONGERS and H. SCHOONEVELD (1969) Effects of hostplant age on phytophagous insects. Entomol. exp. appl. 12: 714-720.
3. DIXON, A. F. G. (1963) Reproductive activity of the sycamore aphid, Drepanosiphum platanoides (SCHR.) (Hemiptera, Aphididae). J. Anim. Ecol. 32: 33-48.
4. DIXON, A. F. G. (1966) The effect of population density and nutritive status of the host on the summer reproductive activity of the sycamore aphid, Drepanosiphum platanoides (SCHR.). J. Anim. Ecol. 35: 105-112.
5. EHARA, S. and N. SHINKAJI (1975) An Introduction to Agricultural Acarology. Zenkoku Noson Kyoiku Kyokai, Tokyo, 328 pp. (in Japanese).