Zinc Sulfate, Sugar Alcohol Zinc Sprays Improve Apple Quality (image) American Society for Horticultural Science Share Print E-Mail Caption Scientists determined that zinc sprays applied at critical times in the growing cycle can enhance the quality of apples. Based on a cost analysis, the authors recommended application of sprays to apple leaves at four weeks before harvest. Credit Photo courtesy of Dr. Ming Li Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.