洋桔梗是公认的栽培难度较大的花卉之一。原因之一是洋桔梗种植过程中易受各种土传病害和茎叶病害的侵染,造成品质大幅下降。霜霉病是多数温室花卉易出现的病害,但更为严重的在于发病时不仅只是叶片受损,更可能引起植株失去商品价值或死亡。洋桔梗原产于干燥少雨的北美洲草原荒漠地带,而大棚中易出现低温多湿和高温多 Eustoma is recognized as one of the more difficult to cultivate flowers. One of the reasons is that Eustoma is susceptible to various soil-borne diseases and stem-leaf diseases during planting, resulting in a substantial decline in quality. Downy mildew is a disease most likely to occur in most greenhouse flowers, but even more so when it comes to disease, it is not just the leaves that are damaged, but more likely to cause the plant to lose its commercial value or die. Eustoma originated in the dry and rainy desert prairie in North America, and the greenhouse prone to low temperature and humidity and high temperature and more