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苹果小叶病系因缺锌所引起,在我国苹果产区均有发生。缺锌病株生长发育受阻,产量、品质下降。针对苹果生产存在的实际问题,作者于1978～1986年先后在陕西省凤县、河北省永年、大名等县进行了苹果小叶病防治技术研究。通过多年多点的田间试验与营养诊断研究结果表明,在苹果盛花后3周用0.2%硫酸锌或其他锌肥与0.3～0.5%尿素混喷,防治苹果小叶病效果显著,病枝恢复率达90%左右,平均增产22.4%。1986年在河北邯郸地区10个县示范推广22564亩,经济效益明显。该项技术简单易行,成本低廉,可在我国苹果缺锌地区推广应用。
Apple leaflet disease due to zinc deficiency caused in our apple producing areas have occurred. Zinc deficiency strains growth and development blocked, yield, quality decline. Aiming at the practical problems of apple production, the author carried out the research on prevention and control of apple leaf disease in Feng County, Shaanxi Province, Yongnian County, Daming County and other counties from 1978 to 1986. The results of multi-year field experiment and nutrition diagnosis showed that spraying apple blossoms with 0.2% zinc sulfate or 0.3-0.5% urea three weeks after blooming, the effect of preventing and controlling apple leaflet disease was remarkable, and the recovery rate of diseased branches reached About 90%, an average increase of 22.4%. In 1986, Hebei Province, Handan area 10 counties demonstration 22564 acres of demonstration, obvious economic benefits. The technology is simple and easy, low cost, can be applied in zinc deficiency areas of apple in our country.