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Biological Characteristics of the Pathogen of Kuerle Pear Black Spot and  Screen of Fungicides in the Laboratory(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2013年05期
Page:
109-113
Research Field:
Publishing date:

Info

Title:
Biological Characteristics of the Pathogen of Kuerle Pear Black Spot and  Screen of Fungicides in the Laboratory
Author(s):
YANG Rui1; ZHAO Bao-long2; ZHANG Li1; TAN Xiao-long1; WANG Xiao-dong1
1.Key Laboratory of Prevention and Control of Oasis Crop Disease，Shihezi，Xinjiang 832003；2.College of Agricultural，Shihezi University，Shihezi，Xinjiang 832003
Keywords:
pear black spot; biological characteristic; fungicides; spore germination
PACS:
S 436.612.1+4
DOI:
-
Abstract:
In order to further understand biological characteristics of the pathogen caused Kuerle pear black spot in Xinjiang，the pathogenicity of the strain LH08 by needling methods and effection different environment factors on mycelia growth and conidium germination were studied.The results showed that the optimum temperature for mycelia growth and spore germination were 25~30℃,28~30℃，respectively.The optimum pH value for mycelia growth was 6，and the optimum pH value for spores germination was 7.There was not significant difference in the rate of conidium germination between on the pear pulp and on the pear pericarp.The germination rate could reach 95.8% at 30℃ for 12 h on the pear pericarp.In addition，the symptom induced by artificial inoculation with crude extract toxins produced by the strain LH08 was like the symptoms in the field，too.Further，it implied that the toxins might play an important role in infection.The results of chemical screening among seven kinds of fungicide showed that thiophanate methyl 70% WP was most effective to inhibition conidium germination.The inhibition rate was 92% at 2 000 times diluent of thiophanate methyl.

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Last Update: 2014-08-22