Effect of constant temperatures viz, 18 ± 1, 21 ± 1, 27 ± 1, 30 ± 1 and 33 ± 1 °C on egg and nymphal development of Dysdercus cingulatus revealed that the development rate of egg and nymphs gradually increased with increase in temperature, while total development period decreased but started to increase again at 33 ± 1 °C. The development threshold was determined to be 12.46, 11.56, 12.9, 11.2, 10.9 and 10 °C for egg and nymphs (I to V instar), respectively, with corresponding thermal constant being 66.7, 62.5, 47.6, 71.4, 76.9 and 100 DD. Total thermal constant requirement to complete a generation was thus 425.1 DD.

中文翻译：

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红色棉虫（Dysdercus cingulatus（F.））的热常数和发育阈值的测定

效果恒定温度即的，18±1,21±1,27±1,30±1和33±1℃的蛋和若虫发育Dysdercus cingulatus透露，蛋和若虫的发展速度逐渐随温度增加而增加，虽然总开发时间有所减少，但在33±1°C时又开始增加。鸡蛋和若虫（I至V龄）的发育阈值分别确定为12.46、11.56、12.9、11.2、10.9和10°C，相应的热常数分别为66.7、62.5、47.6、71.4、76.9和100 DD 。因此，完成一个世代所需的总热常数为425.1 DD。