Larvae of Leptinotarsa decemlineata developed faster and consumed less food under short-day (Sd, 12:12 h light:darkness) than under long-day (Ld, 18:6 h L:D) conditions. The average index of food conversion efficiency was 5.4 in the Ld (25 degrees C), and 7.2 and 11.9 (at 20 and 25 degrees C, respectively) in the Sd insects. Pupae were smaller under the Ld conditions due to a greater loss of biomass during the prepupal period that was nearly twice longer than in the Sd insects. Virgin Ld females laid eggs for 6 months and survived 13 months. The lack of oviposition, reduced food intake, and behavioural changes characterised diapause in the Sd adults. Application of 100 microg JH III to newly ecdysed adults was used to probe diapause intensity. At 25 degrees C, the treatment elicited oviposition most effectively in females that were just transferred from the Ld to the Sd conditions. A distinctly lower response occurred in insects that had been kept under Sd conditions since hatching; their transfer to Ld conditions at the time of treatment had little effect on JH sensitivity. JH application to Sd females reared at 20 degrees C caused enlargement of the germaria but no eggs were formed.

译文

Leptinotarsa decemlineata的幼虫在短日 (Sd,12:12 h光: 黑暗) 下比在长日 (Ld,18:6 h L:D) 条件下发育更快,消耗更少的食物。食物转化效率的平均指数在Ld (25 ℃) 中5.4,在Sd昆虫中7.2和11.9 (分别在20和25 ℃)。在Ld条件下,p较小,这是由于在p前时期的生物量损失更大,比Sd昆虫长近两倍。处女Ld雌性产卵6个月,存活13个月。Sd成年人缺乏产卵,食物摄入减少和行为改变是滞育的特征。将100 microg JH III应用于新蜕皮的成年人,用于探测滞育强度。在25摄氏度下,该治疗最有效地在刚从Ld转移到Sd条件的雌性中引起产卵。自孵化以来一直保持在Sd条件下的昆虫的反应明显较低; 处理时它们转移到Ld条件对JH敏感性影响不大。向在20摄氏度下饲养的Sd雌性施用JH会导致germaria增大,但没有形成卵。

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