Pernezny Ken, Collins Janice
University of Florida, Institute of Food and Agricultural Sciences, Everglades Research and Education Center, P.O. Box 8003, Belle Glade 33430.
Plant Dis. 1997 Jul;81(7):791-794. doi: 10.1094/PDIS.1997.81.7.791.
Epiphytic populations of Xanthomonas campestris pv. vesicatoria were monitored on leaves and in buds of resistant and susceptible pepper cultivars over five seasons. Epiphytic populations were higher on the susceptible cultivar Jupiter than on the resistant cultivar Boynton Bell in four of the five seasons. In copper-sprayed plots, populations in buds of Jupiter plants were consistently higher than on leaves. In one test, copper sprays reduced X. campestris pv. vesicatoria populations by 99% on leaves, compared with only a 51% reduction in buds. In another test on a commercial pepper farm, no differences were found between populations on resistant and susceptible plants spaced as close as 1.2 m. However, combined data on buds for the three cultivars showed populations were higher than those on leaves on three of four sampling dates. These differences were attributed to the heavy use of copper on this farm.
在五个季节里，对抗病和感病辣椒品种的叶片及芽中野油菜黄单胞菌疮痂病致病变种的附生菌群体进行了监测。在五个季节中的四个季节里，感病品种“朱庇特”上的附生菌群体数量高于抗病品种“博因顿·贝尔”。在喷施铜制剂的地块中，“朱庇特”植株芽中的菌量始终高于叶片上的菌量。在一项试验中，喷施铜制剂使叶片上的野油菜黄单胞菌疮痂病致病变种菌量减少了99%，而芽中的菌量仅减少了51%。在另一个商业辣椒农场进行的试验中，间距仅1.2米的抗病和感病植株上的菌量没有差异。然而，三个品种芽的综合数据显示，在四个采样日期中的三个日期，芽中的菌量高于叶片上的菌量。这些差异归因于该农场大量使用了铜制剂。
