Davey R B, Cooksey L M, Despins J L
United States Department of Agriculture, Cattle Fever Tick Research Laboratory, Mission, TX 78572.
Vet Parasitol. 1991 Nov;40(3-4):305-13. doi: 10.1016/0304-4017(91)90110-h.
The survival period for larvae of Boophilus annulatus (Say), Boophilus microplus (Canestrini) and hybridized Boophilus ticks was determined by exposure to various combinations of temperature (20, 25, 30 and 35 degrees C) and relative humidity (32, 63, 75, 84 and 97% RH) in the laboratory. Results indicated that within a given temperature and RH regime, there was no difference (P greater than 0.05) in larval survival among the three species tested, indicating that these ticks respond similarly over a wide range of temperature and RH combinations. Larval survival in all three species was longest (P less than 0.05) at 20 degrees C and either 84 or 97% RH. With each increase in temperature at the 84 and 97% RH treatment levels, there was a corresponding significant (P less than 0.05) decrease in larval survival. When the temperature reached 35 degrees C at all humidities or when the RH was 63% or less at all temperatures, the mean larval survival period was 43 days or less in all cases and little difference (P greater than 0.05) was observed among the treatment regimes included. Results suggest that at a RH of 75% and more, the temperature is the determining factor in larval survival, whereas at a RH of 63% and less the RH is the determining factor in larval survival, regardless of temperature.
通过在实验室中让环形牛蜱（Say）、微小牛蜱（Canestrini）和杂交牛蜱暴露于不同温度（20、25、30和35摄氏度）与相对湿度（32、63、75、84和97%RH）的组合下，测定了这三种牛蜱幼虫的存活期。结果表明，在给定的温度和相对湿度条件下，所测试的这三种牛蜱幼虫的存活率没有差异（P大于0.05），这表明这些蜱在广泛的温度和相对湿度组合下反应相似。在20摄氏度以及84%或97%的相对湿度条件下，所有这三种牛蜱幼虫的存活期最长（P小于0.05）。在84%和97%相对湿度处理水平下，随着温度每升高一次，幼虫存活率相应地显著（P小于0.05）下降。当在所有湿度条件下温度达到35摄氏度，或者在所有温度条件下相对湿度为63%或更低时，所有情况下幼虫的平均存活期均为43天或更短，在所包括的处理条件之间未观察到显著差异（P大于0.05）。结果表明，在相对湿度为75%及以上时，温度是幼虫存活的决定因素；而在相对湿度为63%及以下时，无论温度如何，相对湿度是幼虫存活的决定因素。
