近几年来，我地有333hm2苹果园木同程度地发生小叶病；有的发病率高达70％，矮化中间砧的富士园尤其严重。一般表现为春季发芽晚，抽叶后生长停滞，叶片狭小，叶绿向上，叶呈淡黄绿色或浓淡不匀；病枝节间缩短，细叶族生成丛状；花芽很少，花朵小而色淡，坐果率低，果实生长发 In recent years, I have 333hm2 apple orchard with the same degree of leaflet disease; some incidence as high as 70%, dwarfing the middle anvil Fujiyuan particularly serious. Generally manifested as late spring sprouting, stagnant growth after pumping leaves, narrow leaves, green leaves upward, yellowish green leaves or shades of uneven; short branches between branches shortened to produce clusters; small flower buds, flowers small and color Light, fruit setting rate is low, fruit growth hair