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首页> 外文期刊>Plant Disease >Effect of Foliar Trimming and Fungicides on Apothecial Number of Sclerotinia sclerotiorum, Leaf Blight Severity, Yield, and Canopy Microclimate in Carrot
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Effect of Foliar Trimming and Fungicides on Apothecial Number of Sclerotinia sclerotiorum, Leaf Blight Severity, Yield, and Canopy Microclimate in Carrot

机译：叶面修剪和杀菌剂对胡萝卜菌核盘菌数量，叶枯病严重性，产量和冠层微气候的影响

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摘要

Foliar trimming of the carrot canopy has potential for reducing the severity of Sclerotinia (Sclerotinia sclerotiorum) rot of carrot (Daucus carota subsp. sativus). The effect of trimming the carrot foliage once or twice, with and without fungicide application, was examined on carrot plants grown on organic soil for 3 years at the University of Guelph-Muck Crops Research Station in Ontario, Canada. The number of S. sclerotiorum apothecia, carrot leaf blight (CLB; Alternaria dauci and Cercospora carotae) severity, canopy microclimate, and total and marketable yield were assessed. The number of apothecia of S. sclerotiorum and relative humidity in the canopy were reduced by trimming done at either the first observation of apothecia or at 100 days after seeding (DAS). In both cases, the effects of trimming on canopy microclimate lasted between 2 and 4 weeks. Trimming the canopy twice during the season did not reduce the number of apothecia compared with trimming the canopy once at 100 DAS. Foliar trimming had little effect on CLB severity. This was attributed mainly to the lower requirement of the CLB pathogens for prolonged periods of high relative humidity and leaf wetness compared with S. sclerotiorum. Foliar trimming did not improve the efficacy of fungicide applications for CLB control. Trimming the canopy once or twice had no effect on total or marketable yield. Thus, trimming has potential to improve the management of Sclerotinia rot of carrot, and trimming both at first observation of apothecia and at 100 DAS could reduce apothecia production and relative humidity within the canopy.
机译：对胡萝卜冠层进行叶面修剪具有降低胡萝卜（胡萝卜（Saurotusia subsp。sativus））的菌核病​​（Sclerotinia sclerotiorum）腐烂的严重程度的潜力。在加拿大安大略省的Guelph-Muck作物研究站对有机土壤上生长了3年的胡萝卜植物进行了一次或两次修剪胡萝卜叶的效果（有无施用杀真菌剂）。评估了核盘菌（S.sclerotiorum apothecia）的数量，胡萝卜叶枯病（CLB;链格孢（Alternaria dauci）和Cercospora carotae）严重程度，冠层微气候以及总产量和可销售产量。通过第一次修剪或在播种后100天（DAS）进行修整，减少了硬核葡萄球菌的腐殖质数量和冠层中的相对湿度。在这两种情况下，修剪对冠层微气候的影响持续了2至4周。与在100 DAS上一次修剪树冠相比，本季节将树冠修剪两次不会减少紫穗槐的数量。叶面修剪对CLB严重程度影响不大。这主要归因于与硬核链霉菌相比，CLB病原体对长期较高的相对湿度和叶片湿度的需求较低。叶面修剪不能提高杀真菌剂对CLB的控制效果。修剪树冠一次或两次对总产量或可销售产量没有影响。因此，修整具有改善胡萝卜的核盘菌腐烂的管理的潜力，并且在首次观察到脱脂重症和在100 DAS时进行修整都可以减少脱脂重症的产生和冠层内的相对湿度。

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