Slosser J E, Parajulee M N, Hendrix D L, Henneberry T J, Rummel D R
Texas Agricultural Experiment Station, Vernon 76385-1658, USA.
J Econ Entomol. 2002 Apr;95(2):299-306. doi: 10.1603/0022-0493-95.2.299.
The study was conducted in the northern Texas Rolling Plains in 1999 to define the relationship between number of cotton aphids, Aphis gossypii Glover, and resulting contamination of cotton lint by honeydew. Whole-plot treatments were three furrow irrigation management treatments: cotton grown without supplemental irrigation (dryland), irrigated cotton with last irrigation in mid August, and irrigated cotton with last irrigation in late August. Subplots within each irrigation treatment included an untreated check, a plot treated with lambda-cyhalothrin to stimulate aphid population increase, a plot treated with lambda-cyhalothrin followed by pymetrozine after aphids began to increase, and a plot treated with lambda-cyhalothrin followed by thiamethoxam after aphids began to increase. Cotton aphids were counted on leaves picked from the top and bottom half of the plant. Cotton lint was analyzed for contamination by glucose, fructose, sucrose, and melezitose secreted by cotton aphids, and percentage leaf moisture and nitrogen and leaf sucrose concentrations were determined. The manual sticky cotton thermodetector was used to determine degree of lint stickinesss. There was a significant relationship between thermodetector counts and melezitose contamination on lint, and a melezitose concentration of 90.9 microg/g of lint was associated with a thermodetector count of 10, the threshold for sticky lint problems in textile mills. An equation was developed to estimate melezitose concentration on lint as a function of average numbers of aphids per leaf and the interaction between percentage leaf moisture and nitrogen. The number of aphids per leaf associated with a melezitose concentration of 90.9 microg/g of lint ranged from 11.1 to 50.1, depending on percentage leaf moisture and nitrogen. The threshold for sticky lint problems occurred when aphid numbers ranged between 11.1 and 50.1 per leaf after bolls open.
1999年，该研究在得克萨斯州北部的起伏平原开展，以确定棉蚜数量与棉蚜蜜露对棉绒造成的污染之间的关系。整个试验区的处理方式为三种沟灌管理方式：不进行补充灌溉种植棉花（旱地）、8月中旬进行最后一次灌溉的灌溉棉田以及8月下旬进行最后一次灌溉的灌溉棉田。每个灌溉处理中的子试验区包括一个未处理对照区、一个用高效氯氟氰菊酯处理以刺激蚜虫种群增长的试验区、一个在蚜虫开始增加后先用高效氯氟氰菊酯处理然后用吡蚜酮处理的试验区，以及一个在蚜虫开始增加后先用高效氯氟氰菊酯处理然后用噻虫嗪处理的试验区。在从植株上半部分和下半部分采摘的叶片上统计棉蚜数量。分析棉绒中由棉蚜分泌的葡萄糖、果糖、蔗糖和松三糖的污染情况，并测定叶片水分、氮含量百分比以及叶片蔗糖浓度。使用手动粘性棉花热探测器来确定棉绒的粘性程度。热探测器计数与棉绒上的松三糖污染之间存在显著关系，棉绒中松三糖浓度为90.9微克/克时对应的热探测器计数为10，这是纺织厂中粘性棉绒问题的阈值。开发了一个方程，以根据每片叶子上蚜虫的平均数量以及叶片水分百分比和氮含量之间的相互作用来估算棉绒上的松三糖浓度。与棉绒中松三糖浓度为90.9微克/克相关的每片叶子上的蚜虫数量在11.1至50.1之间，具体取决于叶片水分百分比和氮含量。棉铃开放后，当每片叶子上的蚜虫数量在11.1至50.1之间时，就会出现粘性棉绒问题的阈值。
