| 水黄皮叶斑病的成因、严重性及杀菌剂防止 |
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| 作者单位： | Department of Botany University of Chittagong，Chittagong-4331，Bangladesh，Institutes of Forestry and Environmental Sciences，University of Chittagong，Chittagong-4331，Bangladesh，Institutes of Forestry and Environmental Sciences，University of Chittagong，Chittagong-4331，Bangladesh，Institutes of Forestry and Environmental Sciences，University of Chittagong，Chittagong-4331，Bangladesh，Institutes of Forestry and Environmental Sciences，University of Chittagong，Chittagong-4331，Bangladesh，Institutes of Forestry and Environmental Sciences，University of Chittagong，Chittagong-4331，Bangladesh |
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| 摘 要： | 对孟加拉国4个苗圃(IFES、IFESCU、BFRI和ANC)内水黄皮叶斑病症状和严重性进行了调查,结果表明:IFESCU苗圃内叶斑病侵染率及致病指标最高、BFRI次之、ANC最低.与叶斑病相关联的组织从发病植株分离出来,被分离的真菌形成致病性.结果证实胶孢炭疽菌即为致病菌.观察了杧果炭疽病菌丝体生长抑制性并对杀菌剂(Bavistin, Cupravite and Dithane M-45) 有效性和浓度(0.05, 0.10, 0.50, 1.00, 1.50 和 2.00%)进行了鉴定.0.05% Bavistin和Cupravite潜伏8天后,菌丝体生长分别处于最低和最高水平.结果表明:Bavistin杀菌效果最好、Diathane M-45次之,Cupravite对菌丝体生长的抑制作用最低.图1表4参27.
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| 关 键 词： | 严重性 叶斑 水黄皮 杀菌剂防止 |
The severity and cause of leaf spot disease of Pongamia pinnata L. and fungicidal control of the pathogen |
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| Authors: | MAU Mridha FJabbar M K Bhuiyan M Rahman F Akter S Dewan |
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| Abstract: | A survey on the symptom and severity of the leaf spot disease of Pongamia pinnata L. was conducted in the nurseries of the In-stitute of Forestry and Environmental Sciences,University of Chittagong (IFESCU),Bangladesh Forest Research Institute (BFRI) and Aronnak Nursery in Chittagong. The highest infection percentage and disease index were found in IFESCU nursery,followed by BFRI and the lowest was recorded in Aronnak nursery. The associated organism of leaf spot disease of P. pinnata was isolated from the diseased plant parts and the pathogenicity was established with the isolated fungus. Colletorichum gloeosprioides Penz was proved to be pathogenic. The inhibition of mycelial growth of C. gloeosporioides was observed and identified as suitable fungicides (Bavistin,Cupravite and Dithane M-45) and doses (0.05,0.10,0.50,1.00,1.50 and 2.00). The lowest and highest mycelial growth were respectively found on Bavistin and on Cupravite at the concentration of 0.05 after 8th day of incubation. It indicates that out of the three tested fungicides,Bavistin showed most effective,followed by Diathane M-45,and Cupravite was ineffective for its very little inhibition on mycelial growth. |
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| Keywords: | Severity Leaf spot Pongamia pinnata Fungicidal control |
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