Prolonged embrional diapause of tne green oak tortrix Tortrix viridana L. (Lepidoptera, Tortricidae)

Markov, VA.

Entomologicheskoe Obozrenie 71(2): 314-333; 500

1992


ISSN/ISBN: 0367-1445
Accession: 021611223

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Abstract
A fourteen-year study was conducted to determine possible causes for mass egg mortality of T. viridana, particularly after several years of population explosions. Contradictory to other studies, it was shown that frost does not appear to cause mass population decreases. The induction of partial prolonged embryonic diapause of this species at a definite phase of the gradation cycle facilitates an underestanding of the sudden cessation of plant defoliation and degradation of its foci and explains the chronic nature of mass reproduction outbreaks, which are renewed within two years after the eruptive state, and also explains the fact that the prognosis does not coincide with actual plant defoliation.