Study on the IncidenceMechanism of the Thick Rotten D isease ofZ iziphus zizyphus ( L. ) Meikle. cv. 'Jinsixiaozao'
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1.
CangzhouA cad emy of Agricu ltu ral and Forestry S cien ces ofHebei Prov ince, Cangzhou?? 061001, H ebe,i Ch ina
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2.
South CanalR iverManagement Off ice ofHebei Prov ince, Cangzhou?? 061001, Heb e,i Ch ina
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3.
A gricu ltu ralBureau ofCangzhou City,Cangzhou?? 061001, H ebe,i Ch ina
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4.
Cangx ian Forestry Bureau ofHebei Province, Cangzhou?? 061000, H ebe,i Ch ina
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Received Date:
2006-01-05
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Abstract
Based on a lot o f laboratory experiments and fie ld inspections, the infection of pathogens to the organs andfruits o fZ iziphus zizyphus cv. ‘Jinsix iaozao’ , spore germ ination, overw intering hos,t regu larity of sporocarp format ion, the relat ion be tw een the infecting ra te and ra infall vo lum ew ere studied. Itw as indicated that pathogens startedto infect the fruct iferous branches and fru it stalks in the first ten days of June. Fruits w ere in fected in the first tendays of Ju ly, and the in fect ing rate reached the peak in the last ten days o fAugus.t The diseasew as latent infectionat firs.t The pathogens could overw inter inmany organs o fZ iziphus z izyphus cv. ‘Jinsix iaozao’ , such as bark, branches, leaves, and fru its. Bu t the fruits w ere themost importan t infection source. It could overw inter in the trees ofpop lars, S iber ian elm, peach, app le and pear around jujube garden a lso. The spo rocarp had asexual and sexualgenerat ion on the residua l diseased fru its. Sexua l genera tion infected the ju jube. The con idiophore of fresh fru itscould in fect again. The infecting rate ofP hysalosp ora obtuse, the pathogen, mostly depended on the ra infall prec ip itation in the last tw enty days of Augus.t
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