FIELD RESISTANCE TO FRUIT SHRINK DISEASE IN CHINESE JUJUBE GERMPLASM

Jujube fruit shrink disease (JFSD) is one of the most important fruit diseases in China, which usually results in loss of fruit yield over 30% and reduces market value of the produce significantly.
Seventy-seven kinds of jujube germplasm growing in Cangxian county of China were employed to evaluate the resistance to JFSD in field trials during fruit white-ripening stage (early September) from 2006 to 2009. Both the average disease index (DI) and percentage of disease fruit (PDF) showed abnormal distribution.
Thus, the resistance to JFSD of cultivars might be divided into five grades based on the average of DI, i.e. 0-5%, 5-10%, 10-15%, 15-25% and more than 25%. Of the 77 cultivars tested, 80.52% were evaluated as highly resistant, 2.60% resistant, 7.79% moderately resistant, 6.49% susceptible and 2.60% highly susceptible.
Among the leading cultivars in China, ‘Pozao’ and ‘Hupingzao’ are highly susceptible, ‘Jinsixiaozao’, ‘Yuanlingzao’, ‘Changhong’ and ‘Dongzao’ are highly resistant.

II International Jujube Symposium

C.H. Zhang, Z.H. Zhao, M.J. Liu

Ziziphus jujube Mill., fruit shrink disease, field resistance

https://doi.org/10.17660/ActaHortic.2013.993.22