龙眼角颊木虱发育起点温度和有效积温的研究

在人工气候室不同温度下测定龙眼角颊木虱的各个虫态及全世代的发育起点温度和有效积温.研究结果表明,在试验温度范围内(18-30℃)龙眼角颊木虱的生命活动能正常进行.发育历期随温度的升高而缩短,随温度的降低而延长;在18℃时从卵发育到成虫需72.76d,在30℃时从卵发育到成虫需31.76d.龙眼角颊木虱室内人工饲养温度以24-30℃范围内发育历期最短,发育速度最快.全世代的理论发育起点温度C为6.966±2.0142(℃),有效积温K为770.224土88.2071(日度).根据在福州全年大于发育起点温度的有效积温约为4550日·度;计算出龙眼角颊木虱在福州地区一年发生的理论代数为5.91代,这与田间实际发生代数6代基本吻合.为龙眼角颊木虱在福州地区发生提供了预测依据,为化学防治发挥重要的指导作用.

STUDIES ON THE DEVELOPMENTAL ZERO AND EFFECTIVE ACCUMULATED TEMPERATURE OF CORNEGENAPSYLLA SINICA YANG ET LI (HOMOPTERA)

The developmental zero and effective accumulated temperature for individual development of Cornegenapsylla sinica were measured by the experiment under constant temperature in the climatic chamber. The results indicated that this psyllid could complete its life cycle under the temperature of 18-30℃. The development period decreased as the increase of temperature within the favorable range. Nymph stage had the longest period, while the adult had the shortest. To complete one life cycle, 72.76 days were needed under 18℃, and only 31.76 days under 30.The theoretical developmental zero (C) and effective accumulated temperature (K) for one whole life cycle were 6. 966 ± 2. 0142 (℃) and 770. 224 ± 88. 2071 (day. degree), respectively. Based on the observed K-value from temperatures above C which is 4550 day. degree per year, 5.91generations theoretically occur in this region, which is coincided with the actual 6 generations,indicating that the theoretical C- and K- value are applicable for the prediction of emergence of this pest. Predictions for the timing of chemical control proved useful.