THE Photoperiod as a control agent against adoxophyes reticulana (lepidoptera; tortricidae)
1968
ANKERSMIT, G.W.
The photoperiodic responses were studied of Adoxophyes reticulana reared on a wheat-germ medium. Temperature had only a minor effect on the response. At photoperiods of 16 hrs or more hardly any diapause occurred. At photoperiods of 10 to 13 hrs a high incidence of diapause was observed. Light-interruptions during the dark period of an LD 13:11 cycle revealed a maximum sensitivity for light about 16½ hrs after the beginning of the main light period. Light-interruptions of 2 min were effective. The effect of these short light-interruptions increased by lengthening of the main light period from 13 to 14 hrs. In field experiments with larvae on small apple-trees, 2-min light-breaks about 16½ hrs after sunrise were effective in preventing diapause in about 80% of the population. The first half of the larval development period was the most sensitive phase for photoperiodic induction.
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