The Natural Control of Population Balance in the Knapweed Gall-Fly (Urophora jaceana)

Abstract

2. THE EXPERIMENTAL MEASUREMENT OF FECUNDITY. I. . . . 48 (a) The effect of mating on fecundity . . . . . . . . . . . . 149 (b) The effect of feeding on fecundity . . . . . . . . . . . 149 (c) The effect of combinations of temperature and humidity on fecundity . . . . 50 3. FIELD OBSERVATIONS ON THE ADULT GALL-FLIES . . . . . . . . . . . I52 (a) The population density of the gall-flies and its bearing on their fecundity. . . . . I52 (b) Experiment on the dispersal of adult gall-flies . . . . . . . . . . I53 (c) The effect of weather on the behaviour of the gall-flies . . . . . . . . I54 (d) The rate of oviposition in the field . . . . . . . . . . . . 155 (e) The effect of weather on fecundity . . . . . . . . . . . . 157