The mating behavior of Lithocolletis ringoniella MATSUMURA was observed in the laboratory in 1969 and 1970. Under natural light conditions the 1st generation (June 14) mated from 4: 18 a. m. (after the sunrise) until 6: 02 a. m., and the 3rd generation (August 24) mated from 4: 41 a.m. (before the sunrise) until 5: 47 a.m. Male moths were positively attracted to virgin females which took the calling position suggesting the secretion of a sex pheromone by females. Under artificial light conditions adult moths which were kept in the dark 8 hours or more mated normally when exposed to light intensity of 1 lux or more. However, moths exposed to dark periods of 4 hours could not be mated. It was also suggested that the gradual increase of light intensity may be an important factor for the mating of this species. Such a combination of dark and light conditions was more important for the mating of females than males.
Ten species of chalcidoid parasitoids were reared from the citrus leafminer, Phyllocnistis citrella in Thailand. Among them, Ageniaspis sp. seemed to be the most dominant and important biological control agent.
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