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

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.