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- W2350492702 abstract "In order to know the occurrence of the apple valsa canker in Weibei area of Shaanxi,apple trees of different ages and cultivars from 525 orchards in seven counties were surveyed in 2009,2010 and 2011.The results showed that the incidence of apple valsa canker in Weibei area was about 55%,average number of the new scars per tree was 1.5,disease index was 25,diseased lateral branches rate was about 14%,these all indicated the disease was prevalent and serious in this area.There is no significant difference among different years except the rate of diseased lateral branches.Tree-age has a significant difference on the diseased lateral branches rate and disease index.And the incidence increased as trees got older,the disease incidence and the average number of the new scars per tree for the trees at the age of 16-20 years were 58.89%,46.21% higher than these of the trees at the age of 6-10 years.There was significant difference of diseased lateral branches rate among different cultivars,Qinguan had lower disease incidence and disease index than other cultivars.Greatly difference was indicated for Fuji among different regions.The disease in the West part of Weibei loess tableland was the most serious compared with other regions.The planting density affected the disease occurrence of Fuji greatly.The disease incidence,average number of the new scars per diseased tree,disease index and diseased lateral branches rate were all increased as the planting density got thicker." @default.
- W2350492702 created "2016-06-24" @default.
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- W2350492702 date "2013-01-01" @default.
- W2350492702 modified "2023-09-25" @default.
- W2350492702 title "Survey of Apple Valsa Canker in Weibei Area of Shaanxi Province" @default.
- W2350492702 hasPublicationYear "2013" @default.
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