Klingeman W E, Braman S K, Buntin G D
Department of Entomology, University of Georgia, Griffin 30223, USA.
J Econ Entomol. 2001 Feb;94(1):129-37. doi: 10.1603/0022-0493-94.1.129.
The effects of azalea lace bug, Stephanitis pyrioides (Scott), feeding injury on azalea growth and development were investigated using 'Girard's Rose' azaleas during a 2-yr field study in Georgia Low, medium, and high injury treatments, which corresponded to 6, 8, and 14% maximum canopy area injury, were compared with control azaleas that received no lace bug infestation. Flower number, whole-shrub leaf and stem dry mass, and dry mass and size of new growth tissues were unaffected by treatments. In contrast, growth index measurements, a general measure of variability frequently used for horticultural differentiation, showed significant reductions for all treatments in comparison to control azaleas after 20 wk. Though not directly quantified, this apparent discrepancy may be explained as an artifact of lace bug feeding-induced leaf abscission. Growth index measurements had considerable variability and may not be the most reliable measurement of size. In July 1998, plant canopy densities among azaleas maintained in the high injury treatments were approximately 15% less full than the canopies of control shrubs. Predaceous insects had a significant negative association with azalea lace bug number during the 2-yr study. Flower and new tissue production, measured destructively during two growing seasons, revealed azalea tolerance to 14% of maximum canopy area lace bug feeding-injury levels.
在佐治亚州进行的一项为期两年的田间研究中，使用‘吉拉德玫瑰’杜鹃花调查了杜鹃网蝽（Stephanitis pyrioides (Scott)）取食伤害对杜鹃花生长发育的影响。将低、中、高伤害处理（分别对应最大冠层面积伤害为6%、8%和14%）与未受网蝽侵害的对照杜鹃花进行比较。处理对花的数量、全株叶片和茎干质量以及新生长组织的干质量和大小没有影响。相比之下，生长指数测量是园艺分化中常用的一种反映变异性的综合指标，在20周后，与对照杜鹃花相比，所有处理的生长指数均显著降低。虽然没有直接量化，但这种明显的差异可能是由于网蝽取食导致叶片脱落造成的假象。生长指数测量具有相当大的变异性，可能不是最可靠的大小测量指标。1998年7月，高伤害处理下的杜鹃花植株冠层密度比对照灌木的冠层密度大约低15%。在为期两年的研究中，捕食性昆虫与杜鹃网蝽数量呈显著负相关。在两个生长季节通过破坏性测量得出的花和新组织产量表明，杜鹃花能够耐受高达最大冠层面积14%的网蝽取食伤害水平。
