Effects of Physical and Chemical Stimuli on Termination of Embryonic Diapause in the Spider Mite, Panonychus bambusicola Ehara et Gotoh(Acari: Tetranychidae).

Abstract

Gotoh, T., T. Kamoto and H. Oku, 1994. Effects of physical and chemical stimuli on termination of embryonic diapause in the spider mite, Panonychus bambusicola Ehara et Gotoh(Acari: Tetranychidae). J. Acarol. Soc. Jpn., 3(2): 53-58. Physical and chemical stimuli were effective in breaking diapause in eggs of the spider mite, Panonychus bambusicola Ehara et Gotoh. A 60-day or longer exposure to 5°C promoted hatching in some diapause eggs. However, more eggs terminated diapause when stimulated with a needle or exposed to ammonia-gas after chilling, although such artificial stimuli were not effective in terminating diapause if the eggs had not been chilled. Eggs stimulated with a needle or ammoniagas after chilling hatched more rapidly at 25°C than did those experienced chilling alone. Because such physical and chemical treatments were effective in terminating diapause only when they were applied to pre-chilled eggs, these stimuli seemed to influence the final phase of diapause development.