Salix babylonica but beyond China, it has not generally been as successfully cultivated as some of its hybrid derivatives, being sensitive to late-spring frosts. In the more humid climates of much of Europe and eastern North America, it is susceptible to a canker disease, willow anthracnose ("Marssonina salicicola"), which makes infected trees very short-lived and unsightly. "Salix babylonica" (Babylon willow) has many cultivars, including: Various cultivars of "Salix matsudana" (Chinese willow) are now often included within "Salix babylonica", treated more broadly, including: Yet other weeping willow cultivars are derived from interspecific "Salix" hybrids, including "S. babylonica" in their parentage. The most widely
Micrurapteryx salicifoliella arbusculoides", "Salix babylonica", "Salix bebbiana", "Salix brachycarpa", "Salix exigua", "Salix glauca", "Salix integra", "Salix interior", "Salix lasiandra", "Salix longifolia", "Salix monticola", "Salix novae-angliae", "Salix planifolia" and "Salix scouleriana"). They mine the leaves of their host plant. The mine is found on the upperside of the leaf, sometimes covering the entire leaf area. It is a flat upperside blotch, initially greenish but later turning brown. The larva chews a hole through the bottom of the mine and exits through it to pupate. The cocoon is often spun on the upperside of a leaf, parallel to its long axis. Micrurapteryx salicifoliella Micrurapteryx