Effect of different fruit bags on yield, quality and occurring probability of diseases and insect pest of Jinqiu pear

The objective of the experiment was to study the effect of bagging with 3 types fruit bags on yield, quality and occurring probability of diseases and insect pest of Jinqiu pear. The experiment was laid out in a randomized block design with four treatments,namely, control (CK); homemade newspaper bag (T1); common convenient bag (T2); special ventilation bag (T3). Bagging had a negative effect on yield of Jinqiu pear. Bagging could significantly improve appearance quality, however, only had little effect on internal quality.The concentration of total acid and vitamin C of Jinqiu pear were increased, and concentration of total sugar and total soluble solids of Jinqiu pear were decreased by bagging. More, bagging had a positive role for preventive diseases and insect pest, especially insect pest.The comprehensive evaluation showed that the treatment of using special ventilation bag was the best in all bagging treatments.