Study on Resistance to Downy Mildew of Some Cucumber and Melon Varieties and Its Component

Taking some cucumber and melon varieties as material,by disease resistant component analysis,the resistance to downy mildew was studied.The results showed that some cucumber varieties,such as ‘Tangshanqiugua 606',‘Shuiguoxing 101'(Tangshanqiugua),‘Jizaoguamanjia',‘Jinyan No.4',and‘Lvbao No.2',some melon varieties,such as ‘Chuntianshidai'and‘Gaotangjinyu',were slightly susceptible and showed relatively small disease spots,less number of disease spots and fewer sporangia produced.Others cucumber varieties,such as‘Jiza No.4'and‘Mapihuang',and melon varieties,such as‘Ruyi',and‘Jintianjiamei'were the highest susceptible and showed relatively bigger lesion,larger number of disease spots and more sporangia production.