Abstract:

To improve the growth rate of grape, experimental studies on one-year-old seedlings of ‘Miguang’ grape were carried out. We took five different treatments to observe the influence on the growth rate of the seedlings and the downy mildew infection of ‘Miguang’ grape. The five treatments were as follows: CK, sprayed with water; treatment A, sprayed with No.3 Lyudikang of different concentrations for different times; treatment B, sprayed with VDAL of different concentrations for different times; treatment C, sprayed with ATailing of different concentrations for different times; treatment D, sprayed with Pythium oligandrum dolliverson of different concentrations for different times. The results showed that the growth rate of ‘Miguang’ grape was significantly improved by different spraying treatments with different effects. The best effect was obtained by spraying twice with 0.1% concentration of ATailing. The effects of spraying twice separately with 0.2% concentration of No. 3 Lyudikang, 0.1% concentration of VDAL and with 0.1% concentration of Pythium oligandum dolliverson had almost the same effect. The results also proved that all treatments could significantly reduce the downy mildew infection rate and significantly increase the height of the plant and the length and diameter of the branch of ‘Miguang’ grape under spraying twice with 0.2% concentration of No. 3 Lyudikang and 0.1% concentration of VDAL and 0.1% concentration of ATailing and 0.1% concentration of Pythium oligandum dolliverson separately. In conclusion, the application of No. 3 Lyudikang, VDAL, ATailing and Pythium oligandrum dolliverson alone have significant effects on grape growth and downy mildew control in ‘Miguang’ grape cultivation, the study could provide a feasible plan for the development of grape industry in Zhangjiakou.

Key words: No. 3 Lyudikang, VDAL, ATailing, Pythium oligandum dolliverson, grape growth, downy mildew