Photoperiodism of diapause induction and diapause termination in Ostrinia furnacalis

• DOI: 10.1111/eea.12226
• Publication Date: 2014-08-27T13:59:35Z
• Authors: Hui‐Zhong Yang; Xiao‐Yun Tu; Qin‐Wen Xia; Hai‐Min He; Chao Chen; Fang‐Sen Xue
• Keywords: Darkness; Facultative

Abstract The A sian corn borer, O strinia furnacalis ( G uenée) L epidoptera: C rambidae), enters facultative diapause as fully grown larva in response to short‐day conditions during the autumn. Photoperiodic curves showed a stable critical daylength of ca. 13.5 h at 25, 28, and 30 °C, which is nearly identical with between 13 22 min 27 field. incidence obviously declined ultra‐long nights (14–22 scotophases) DD (i.e., constant darkness). required day number RDN ) for 50% differed significantly short‐ long‐night cycles different temperatures, indicating that effect one short night was equivalent three long 25 28 °C. third instar stage most sensitive photoperiod. Night‐interruption experiments 1‐h light pulse L9:D15 L12:D12 exhibited broad trough inhibition. In using non‐24‐h light‐dark cycles, only containing 12 resulted high diapause, regardless duration accompanying period, dark period greater importance than period. Nanda‐Hamner Bünsow . did not show any rhythmic fluctuations 24 their photoperiodic curves; low when scotophase length exceeded 16 h. rearing daylengths 11 evoked intensity By transferring naturally overwintering larvae from natural photoperiod or L15:D9 combined appeared have significant influence on development early phase diapause. Field observations 2 years revealed pupation adult emergence individuals (50% responses) occurred May mid‐May, respectively.