Influence of bag permeability on black dot disease and the contents of Pb and total acids of apple

Filed experiments were carried on by choosing nine kinds of typical bag, the quality of apple was tested according to GB10651-1989 in 10 days after sampling. Results show that the bag permeability remarkably affect the index of black dot disease, the contents of total acids and heavy metal Pb of apple. Bag permeability is higher, the index of black dot disease is lower; the content of total acids of apple is higher, taste is better; the content of heavy metal Pb is higher(in similar condition), security risk is higher. Under premise that ensure apple security, the index of black dot disease is lower, the content of total acids of apple is higher, apple's quality is higher, combined China's green apple producing standard and existing technical level, bags which permeability is 3～5 μm/(Pa·s) should be chosen in apple producing.