McCullough D G, Wagner M R
School of Forestry, Northern Arizona University, 86011, Flagstaff, AZ, USA.
Oecologia. 1987 Feb;71(3):382-387. doi: 10.1007/BF00378711.
Neodiprion autumnalis (Smith) larvae were caged for two successive years on root-trenched, watered, and untreated ponderosa pine (Pinus ponderosa Doug. ex Laws.) to determine effects of host moisture stress on larval feeding. Levels of moisture stress (as measured by the Scholander pressure chamber) differed significantly among treatment levels during 1984 and 1985 larval feeding periods. Differences in larval feeding success were not detected in 1984. In 1985, however, larvae on trenched (stressed) trees clipped and rejected more foliage, consumed more needles, had lower pupal weights, lower survival, and a longer feeding period than larvae on watered or untreated trees. Frass production did not differ among treatment levels. The length of the feeding period was shorter for larvae on watered trees than for larvae on untreated trees, but other measures of feeding success did not significantly differ between watered and untreated trees.
连续两年将秋季黄杉毒蛾（史密斯）幼虫置于经根系挖沟、浇水和未处理的美国黄松（西美黄松道格拉斯变种，Laws.）上，以确定寄主水分胁迫对幼虫取食的影响。在1984年和1985年幼虫取食期，各处理水平间的水分胁迫程度（通过 Scholander 压力室测量）差异显著。1984年未检测到幼虫取食成功率的差异。然而，1985年，与浇水或未处理树木上的幼虫相比，挖沟（受胁迫）树木上的幼虫啃食和拒食的树叶更多，消耗的针叶更多，蛹重更低，存活率更低，取食期更长。各处理水平间的粪便产量没有差异。浇水树木上的幼虫取食期比未处理树木上的幼虫短，但浇水和未处理树木之间的其他取食成功指标没有显著差异。
