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首页> 外文期刊>Pest Technology >Effect of the level of seed tuber infection by Colletotrichum coccodes at planting on potato growth, black dot severity and subsequent yield reduction. (Special Issue: Potato pathology.)
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Effect of the level of seed tuber infection by Colletotrichum coccodes at planting on potato growth, black dot severity and subsequent yield reduction. (Special Issue: Potato pathology.)

机译：种植时，炭疽菌对种子块茎的感染水平对马铃薯生长，黑点严重性和随后减产的影响。 （特刊：马铃薯病理学。）

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A great deal of attentionhas been giventotuber infections of Colletotrichum coccodes as skin blemishes depreciate the tuber's commercial value and serve as means of pathogen spread into new productions areas. This study was carried out on cv. 'Spunta' potato plants to compare, quantitatively, the relative impact of different tuber-borne inoculum levels on black dot severity, plant growth and expected yield loss. Black dot severity recorded 60 (pot experiment) or 90 days post-planting (field experiment) on the below-ground plant parts varied significantly depending on inoculum levels tested. The severest symptoms were induced by the highest seed tubers infections corresponding to more than 50% of the seed tuber surface area covered with black dot lesions. The recorded disease severity was found to be highly and positively correlated with the level of seeds contamination. The aerial part fresh weight noted 60 DPP was reduced, compared to plants grown from the symptomless seed tubers, by 24 and 42% when heavily infested seeds were planted. This growth parameter was also negatively correlated with black dot severity on seed tubers and on the below-ground plant parts. In the pot experiment, tuber weight was reduced by about 14-21% on plants grown from extremely infected seeds as compared with the non infested control plants. Yield decrease, subsequent to the planting of diseased seeds, varied between 15 and 27% when C. coccodes inoculum levels ranged between 1 and 5. The field study revealed the existence of significant and negative correlations between the tuber yield, the level of seed-borne inoculum and disease severity on the below-ground stems, roots and stolons.
机译：由于皮肤瑕疵降低了块茎的商业价值，并作为病原体传播到新产品区的手段，引起了炭疽菌的块茎感染引起了极大的关注。这项研究是在简历上进行的。 'Spunta'马铃薯植物定量比较了块茎传播接种物水平对黑点严重程度，植物生长和预期产量损失的相对影响。地下植株种植后60天（盆栽试验）或种植后90天（田间试验）记录的黑点严重程度根据测试的接种量而有很大差异。最严重的症状是由最高的种子块茎感染引起的，对应于覆盖有黑点病斑的种子块茎表面积的50％以上。发现记录的病害严重程度与种子污染水平高度相关且呈正相关。与从无症状块茎生长的植物相比，种植重度侵染的种子时，空中部分的新鲜重量降低了60 DPP，分别降低了24％和42％。该生长参数还与种子块茎和地下植物部位的黑点严重程度负相关。在盆栽实验中，与未侵染的对照植物相比，从极度感染种子生长的植物上，块茎重量减少了约14-21％。播种患病种子后，产量下降（当C. coccodes接种物水平在1-5之间时）介于15％至27％之间。田间研究表明，块茎产量与种子水平之间存在显着的负相关关系。在地下茎，根和茎上传播接种物和疾病的严重性。

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