Articles
STRUCTURAL RESISTANCE OF DIFFERENT ECOTYPES OF ZIZIPHUS JUJUBA MILL. ‘JINSIXIAOZAO’ TO THICK ROTTEN DISEASE
Article number
840_58
Pages
413 – 418
Language
English
Abstract
Thick rotten disease (Physalospora obtuse (Schw.) Cooke) is one of the most serious diseases that occur on Ziziphus jujuba Mill. Jinsixiaozao in north China.
Yield losses caused by the disease became more and more serious in recent years.
According to the investigation that performed from 1998 to 2005, different ecotypes of Z. jujuba Jinsixiaozao showed significant level of differences in resistance to thick rotten disease.
During eight years investigations, the average disease incidence of susceptible ecotypes was 38.2%, and the average disease index was 20.7. While the average disease incidence and the average disease index of resistant ecotypes were 4.4% and 1.4, respectively.
Both in injury and non-injury inoculation tests, the average disease incidence and the average disease index of resistant ecotypes were lower than susceptible ecotypes both in field trials and laboratory tests.
In laboratory tests the average disease incidence and disease index of resistant and susceptible ecotypes of injury inoculation were 90%, 76.8 and 100%, 100 respectively, that of non-injury inoculation were 55%, 20.2 and 100%, 92.7. In the field trial, the average disease incidence and the average disease index of resistant and susceptible ecotypes of injury and non-injury inoculation were 60%, 32.7; 100%, 98.6; 5%, 2 and 95%, 87.2, respectively.
The resistant ecotypes had thicker fruit peel, fewer lenticels per unit area and less percentage of big lenticels than that of susceptible ecotypes.
Yield losses caused by the disease became more and more serious in recent years.
According to the investigation that performed from 1998 to 2005, different ecotypes of Z. jujuba Jinsixiaozao showed significant level of differences in resistance to thick rotten disease.
During eight years investigations, the average disease incidence of susceptible ecotypes was 38.2%, and the average disease index was 20.7. While the average disease incidence and the average disease index of resistant ecotypes were 4.4% and 1.4, respectively.
Both in injury and non-injury inoculation tests, the average disease incidence and the average disease index of resistant ecotypes were lower than susceptible ecotypes both in field trials and laboratory tests.
In laboratory tests the average disease incidence and disease index of resistant and susceptible ecotypes of injury inoculation were 90%, 76.8 and 100%, 100 respectively, that of non-injury inoculation were 55%, 20.2 and 100%, 92.7. In the field trial, the average disease incidence and the average disease index of resistant and susceptible ecotypes of injury and non-injury inoculation were 60%, 32.7; 100%, 98.6; 5%, 2 and 95%, 87.2, respectively.
The resistant ecotypes had thicker fruit peel, fewer lenticels per unit area and less percentage of big lenticels than that of susceptible ecotypes.
Publication
Authors
W.C. Zhen, S.T. Wang, Y.N. Wang, C.Q. Liu*, Q.L. Wang
Keywords
Ziziphus jujube, ‘Jinsixiaozao’, structural resistance, thick rotten disease, resistant ecotype
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