Parasitism rule of Orobanche Aegyptaica on 3 host crops and resistance evaluation of main cultivars
[Objective]This project aims to clarify the parasitic rule of O.aegyptaica on processing toma-to,zucchini and smacking watermelon and resistance of main cultivars in the hope of providing scientific basis for the control of them in Xinjiang.[Methods]Pot and field random survey were used to carry out the study.[Results]The results of pot experiment showed that the parasitism relationship could be established between 34 to 37 days after sowing the seeds of processed tomatoes,zucchini and watermelon.O.aegyptaica was un-earthed after 5 days for the establishment of the parasitism relationship,while zucchini and processed tomatoes respectively were unearthed after 18 and 21 days.Field survey results from June 21 to 22 showed that the inci-dence rate of O.aegyptaica in the processed tomato field was 42.86%,that in the watermelon field was 7.14%,and no O.aegyptaica in the zucchini field.The incidence of O.aegyptaica in processed tomato fields was 45.45%,that in watermelon fields was 27.27%and that in zucchini fields was 25%from June 28 to 29.The incidence of O.aegyptaica in processed tomato field was 80%,that in watermelon field was 71.43%and that in zucchini field was 86.96%from July 5 to 14.The results of varieties resistance test showed that BVS 32 had the least parasitical content,and the fresh weight and dry weight of O.aegyptaica respectively were 20.97 and 4.26 g/pot.,O.aegyptaica parasite amount of Jinfeng No.8 was the least in the whole growth period of zucchini,and the fresh weight and dry weight of O.aegyptaica were 25.65 and 5.92 g/pot,respec-tively.O.aegyptaica parasite amount of the black medium slice in watermelon varieties were the least,and the fresh and dry weights of O.aegyptaica were 5.38 and 0.78 g/pot,respectively.[Conclusion]The suitable control time for processed tomato,zucchini and watermelon is 20 d after sowing.The best control time respec-tively was from late May to mid-June,early mid-June to mid-late June in processed tomato,zucchini and watermelon fields in northern Xinjiang.Among the main cultivars of processed tomato,zucchini and watermelon planted in Xinjiang,there were no varieties was immune to O.aegyptaica,while processed tomato variety BVS32,zucchini variety Jinfeng No.8 and watermelon variety Heizhongpian have the least amount of parasite,which could be planted as O.aegyptaica resistant varieties in Xinjiang.
万方数据
维普
