Identification of the Pathogenic Fungus Causing Leaf Spot of Zizyphus jujuba in Ningxia and Fungicide Screening in Laboratory(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Identification of the Pathogenic Fungus Causing Leaf Spot of Zizyphus jujuba in Ningxia and Fungicide Screening in Laboratory

Author(s):: KANG Pingzhi1; WU Xiuhong2; SHEN Ruiqing1; ZHANG Huapu1; (1.Institute of Plant Protection，Ningxia Academy of Agriculture and Forestry Sciences，Ningxia Key Laboratory of Plant Disease and Insect Pest Control，Yinchuan，Ningxia 750002；2.Ningxia Tongxin County Forestry Bureau，Tongxin，Ningxia 751300)

Keywords:: Zizyphus jujuba; leaf spot; identification; Stemphylium sp.; fungicide screening

Abstract:: Taking typical leaves of leaf spot of Zizyphus jujuba in Ningxia as materials，the main pathogen species of leaf spot of Zizyphus jujuba in the region and effective fungicides against the disease were studied by the tissue isolation，detached leaves inoculation and inhibition method of mycelial growth.The results showed that Stemphylium sp.were isolated from typical leaves of leaf spot of Zizyphus jujuba in Ningxia and accounted for 85% of the pathogen total isolates.Among them，strain Y-14 of Stemphylium sp.had very strong pathogenicity and was confirmed as the main pathogen species of leaf spot of Zizyphus jujuba in Ningxia; Virulences of 7 kinds of fungicides on pathogen were 25% propiconazole EC>25% prochloraz EC>1010/g Bacillus subtilis WP>10% polyoxin WP>250 g/L azoxystrobin SC>70% mancozeb WP>1% phenazine-1-carboxylic acid SC，especially EC50 value of anterior 5 kinds of fungicides were less than 1.0 g/L，so they should be the best fungicides of leaf spot of Zizyphus jujuba in Ningxia for effective biological and chemical control.

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Last Update: 2015-10-23