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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2011, Vol. 5 Issue (3) : 351-355     DOI: 10.1007/s11703-011-1100-8
RESEARCH ARTICLE |
Occurrence and pathogens of fruit shrink disease in Ziziphus jujuba Mill.
Chaohong ZHANG1, Yuan LIU2, Mengjun LIU1,3(), Decang KONG4
1. Research Center of Chinese Jujube, Agricultural University of Hebei, Baoding 071001, China; 2. Graduate School, Agricultural University of Hebei, Baoding 071001, China; 3. National Engineering Research Center for Agriculture in North Mountain Area, Agricultural University of Hebei, Baoding 071001, China; 4. Forestry Bureau of Cangxian County, Cangxian 061000, China
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Abstract  

The occurrence of fruit shrink disease in Ziziphus jujuba Mill. ‘Linyilizao’ was investigated from 2006 to 2009 in Cangxian of Hebei Province, Taiyuan, and Taigu of Shanxi Province, and the pathogens were isolated from the diseased fruits sampled from both Cangxian and Taiyuan in 2006 and 2007. The pathogens in leaf, fruit, and shoot collected from Cangxian were isolated from June to October in 2008 at 30-day intervals. The incidence of the disease varied significantly with location and year, and the highest incidence was observed in Cangxian during 2006. Three kinds of key pathogens were isolated from the fruits from July to September, i.e., Alternaria alternata Keissler (mainly in July), Phoma destructiva Plowr. (mainly in September), and Fusicoccum sp., of which A. alternata was the most dominant. In leaves, both A. alternata (much more dominant) and P. destructiva could be isolated throughout June to October, but no Fusicoccum sp. was found. At the white-ripening stage of fruit, the isolation rate of A. alternata was the highest in leaves (36.67%), followed by extension shoot (6.67%) and fruit (1.11%) while that of P. destructiva was the highest in extension shoot (31.11%), followed by fruit (13.33%) and leaf (12.22%), with Fusicoccum sp. isolated only in extension shoot (2.22%). The frequency of isolating two or three kinds of above three pathogens together was very low, with the highest rate (19.30%) found in A. alternata and P. destructiva from leaves in July.

Keywords Ziziphus jujuba Mill.      jujube fruit shrink disease      pathogen      occurrence     
Corresponding Authors: LIU Mengjun,Email:lmj1234567@yahoo.com.cn   
Issue Date: 05 September 2011
URL:  
http://academic.hep.com.cn/fag/EN/10.1007/s11703-011-1100-8     OR     http://academic.hep.com.cn/fag/EN/Y2011/V5/I3/351
Fig.1  The incidences of JFSD of ‘Linyilizao’ in different years (Cangxian). In the different group at the same row, the histograms with different letters in the superscripts show significantly different at 0.05 level.
Fig.2  The incidences of JFSD of ‘Linyilizao’ in different regions (2006). In the different group at the same row, the histograms with different letters in the superscripts show significantly different at 0.05 level.
Fig.3  The incidences of JFSD of ‘Linyilizao’ at different ripening stages in 2006. In the different group at the same row, the histograms with different letters in the superscripts show significantly different at 0.05 level.
YearLocationNumber of isolated fruitNumber of isolated tissuePercentage of isolation
A (%)P (%)F (%)
2006Cangxian204025.00c75.00a32.50a
Taiyuan5012050.00a37.50b0.00c
2007Cangxian20608.33d0.00c25.00b
Taiyuan256041.67b0.00c0.00c
Tab.1  The isolation results of diseased fruits from different sites and years
Fig.4  Isolated rates of pathogen from diseased fruit in 2008. In the different group at the same row, the histograms with different letters in the superscripts show significantly different at 0.05 level.
Fig.5  The isolation result of pathogen from jujube leaf (2008). In the different group at the same row, the line graphs with different letters in the superscripts show significantly different at 0.05 level.
Fig.6  The isolation results of pathogen from different organs (September 6, 2008). In the different group at the same row, the histograms with different letters in the superscripts show significantly different at 0.05 level.
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