• ASPINALL, D. (1961). The control of tillering in the barley plant. I. The pattern of tillering and its relation to nutrient supply. Aust. J. biol. Sci. 14, 493.
  • DIXON, A. F. G. (1971a). The role of aphids in wood formation. I. The effect of the sycamore aphid, Drepanosiphum platanoides (Schr.) (Aphididae), on the growth of sycamore. Acer pseudoptatanus L. J. appl. Ecol 8, 165.
  • DIXON, A. F. G. (1971b). The role of aphids in wood formation. II. The effect of the lime aphid, Eucallipterus tiliae L. (Aphididae), on the growth of lime Tilia X vulgaris Hayne. J. appl. Ecol. 8, 393.
  • DIXON, A. F. G. & GLEN, D. M. (1971). Morph determination in the bird cherry-oat aphid, Rhopalosiphum padi L. Ann. appl Biol. 68, 11.
  • DIXON, A. F. G. & WRATTEN, S. D. (1976). Laboratory studies on aggregation, size and fecundity in the black bean aphid, Aphis fabae Scop. Bull. ent. Res. 61, 97.
  • EMDEN, H. F. VAN (1973). Aphid Host Plant Relationships. In: Perspectives in Aphid Biology (Ed. by A. D.Lowe). Bulletin No. 2 of the Entomological Society of New Zealand (Inc.).
  • EMPSON, D. W. (1965). Cereal Pests. M.A.F.F. Bulletin No. 186.
  • EVANS, G. C. (1972). The Quantitative Analysis of Plant Growth. Blackwell Scientific Publications, Oxford .
  • EVERLY, R. T. (1960). Loss in corn yield associated with the abundance of the corn leaf aphid, Rhopalosiphum maidis, in Indiana. J. econ. Ent. 53, 924.
  • HUSSAIN, A., FORREST, J. M. S. & DIXON, A. F. G. (1973). Changes in growth regulator content of radish seedlings, Raphanus sativus, infested with the aphid Myzus persicae, Ann. appl. Biol. 75, 275.
  • KANTACK, E. J. & DAHMS, R. G. (1957). A comparison of injury caused by the apple grain aphid and greenbug to small grains. J. econ. Ent. 50, 156.
  • KLOFT, W. & ERHARDT, P. (1959). Untersuclmngcn ubcr Saugtätigkeit und Schadwirkung der Sitkafichtenlaus, Liosomaphisabietina Walk. (Neomyzaphis abietina Walk). Phytopath, Z. 35, 401.
  • KOLBE, W. (1969). Studies on the occurrence of different aphid species as the cause of cereal yield and quality losses. Pflanzenschutz-Nachrichten Bayer, 22, 171.
  • KOLBE, W. (1970). Further studies on the reduction of cereal yields by aphid infestation. Pflanzenschutz-Nachrichten Bayer, 23, 144.
  • LOWE, H. J. B. (1974). Effects of Metopolophium dirhodum on spring wheat in the glasshouse. Pl. Path. 23, 136.
  • MILES, P. W. (1968). Insect secretions in plants. A. Rev. Phytopath. 6, 137.
  • NUORTEVA, P. (1956). Studies on the effects of salivary secretions of some Heteroptera and Homoptera on plant growth. Ann. Ent. Fenn. 22, 108.
  • ORTMAN, E. E. & PAINTER, R. H. (1960). Quantitative measurements of damage by the greenbug, Toxoptera graminum, to four wheat varieties. J. econ. Ent. 53, 798.
  • RAUTAPÄÄ, J. (1966). The effect of the english grain aphid Macrosiphum avenae (F.) (Hom., Aphididae) on the yield and quality of wheat. Ann. Agric. Fenn. 5, 334.
  • RAUTAPÄÄ, J. (1968a). Changes in the yield and protein quantity of oat caused by Rhopalosiphum padi (L.) (Hom., Aphididae). Ann. Agric. Fenn. 7, 95.
  • RAUTAPÄÄ, J. (1968b). Reduction in yield and changes in brewing quality of bailey caused by Macrosiphum avenae (F.) (Mom., Aphididae). Acta Agric. scand. 18, 233.
  • SCHÄLLER, G. (1968). Biochemische Analyse des Aphidenspeichels und seine Bedeutung fur die Gallen-bildung. Zool. Jb. (Physiol.), 74, 54.
  • STERN, V. M. (1967). Control of aphids attacking barley and analysis of yield increases in the Imperial Valley, California. J. econ. Ent. 60, 485.
  • WOLF, D. D., PEARCE, R. B., CARLSON, G. E. & LEE, D. R. (1969). Measuring photosynthesis of attached leaves with air sealed chambers. Crop Science, 9, 24.
  • WRATTEN, S. D. (1974). The nature of the effects of the aphids Sitobion avenae and Metopolophium dirhodum on the growth of wheat. Ann. appl. Biol. 79, 1.