Investigation On Biological Charactetistics And The Fruit Bagging Of Early Ripening Pear Cultivars

In this experiment, the main phonological periods, growing and bearing habits and fruit bagging were studied on Whangkeumbae, Wonhwang and Cuiguan at Xinjin, Pixian and Ya'an in Sichuan. The main results showed that:1,Whangkeumbae, Wonhwang and Cuiguan grew an bore normally in the three areas. Except the autumn, the other main phonological periods were similar. Whangkeumbae's autumn was the longest among the three pear varieties. The main phonological periods of the same pear variety was earlier in Pixian and later in Ya'an. The rates of new tips of the three kinds of pears were the rate of long-shoot>the rate of mid-shoot> the rate of short-shoot. The rate of long-shoot of Cuiguan was the highest, but Wonhwang was the lowest. The rate of long-shoot of three pear varieties was the highest in Ya'an and was the lowest in Pixian.2,The setting rates of inflorescence were Wonhwang > Whangkeumbae > Cuiguan, and the setting rates of flower were Whangkeumbae > Cuiguan > Wonhwang in the three areas. The bearing of three verities relied on the short fruit shoots mainly. The rate of the short fruit shoot of Wonhwang was the highest, Cuiguan was the lowest.3,Bagging could distinctly improve outer properties of fruits, make fruit dot smaller, peel thinner and fruit surface more smooth. Double-layer bagging was better than single-layer bagging in improving outer properties. The single fruit's weight of bagged fruits was lower than the non-bagged fruits. The content of TSS,SS,Titratable acid,chlorophyl a and chlorophyl b of bagging fruits were fewer than the non-bagged fruits, and the most double-layer bagging fruits were fewer than the single-layer bagging fruits and the non-bagged fruits. The content of carotenoid was opposite. The effect on the content of Vc was not disciplinary. Bagging was not the main factor for the fruit shape.4,Through survey the effect on the bagging in Xinjin, Pixian and Ya'an, the result showed that: the effects of Puyaguang paper bag were the best and Newspaper-bag were the worst on the outer properties of the three pear varieties, and the effects of Chaoyaguang paper bag were the best and Newspaper-bag was the worst in the three areas. The effects of Puyaguang paper bag were the best and stencil paper bag and Newspaper-bag were the worst on the inner properties of the three pear varieties, and the effects of Puyaguang paper bag were the best and Newspaper-bag were the worst in the three areas.5,Whangkeumbae, Wonhwang and Cuiguan are able to resist the pear scab,Gymnosporanium haraeanum and Pnysalospora Pinicola. The main pests were Psylla chinensis. Yang et Li, Aphanostigma jakusuiensis and Grapholithamolesta. There were more Psylla chinensis. Yang et Li on Whangkeumbae, and there were fewer Psylla chinensis. Yang et Li and Aphanostigma jakusuiensis but more Grapholithamolesta in Pixian.Whangkeumbae, Wonhwang and Cuiguan have good inner and outer properties and the character of prematurity, especially Wonhwang and Cuiguan. Because the three pear varieties have strong ability of resisting disease, they could reduce the use of pesticide and the cost in the management and improve the fruit quality. Bagging was greater management on improving fruit quality and Pest Control.