The effects of three latent virus infections(CLSV. SGV and SPV) on the physiology and biochemistry, the growth and fruiting, the yield and quality were studied with comparitive test.

• 对感染混合潜隐性病毒的富士、金冠苹果树进行了生理生化及生长结果指标检测；并与脱除病毒的同品种树作了比较.