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PATHOGENICITY OF PRATYLENCHUS PENETRANS ON ONION

机译：小菜蛾对洋葱的致病性

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Pang, W., S. L. Hafez, P. Sundararaj, B. Shafii, and E. Fallah. 2009. Pathogenicity of Pratylenchus penetrans on onion. Nematropica 39:35-46. Pathogenicity of Pratylenchus penetrans on onion was tested both under greenhouse and microplot conditions. For the greenhouse study, seedlings of onion (Allium cepa) cultivar Tioga were inoculated with P. penetrans at 0, 3000, 6000, 9000, or 1200 females + juveniles/ pot. In field microplots, onions were inoculated 0, 26500, 53000, 106000, or 212000 females + juveniles of P. penetrans/ microplot. Cultural practices recommended by onion production in Idaho were carried out and data on fresh and dry weight of the plant top and roots, bulb diameter and weight, and nematode population in roots and soil were collected at harvest. Increasing inoculum levels led to significant reductions in onion growth and increased nematode population at harvest. Significant reduction in plant growth began at 3000 P. penetrans/ pot or 26500/ microplot. Bulb weight reduction ranged from 31.5% to 64.2% at the inoculum level of 26500 and 212000 P. penetrans / microplot, respectively, in field microplots. Maximum reduction in plant total dry weight was 84.2% at 12000 P. penetrans/ pot under greenhouse conditions. This study will help onion growers in Idaho make decisions on whether or not to grow onions in a field with a specific population density of P. penetrans in the soil.
机译：Pang，W.，S. L. Hafez，P.Sundararaj，B.Shafii和E.Falrah。 2009.葱的Prattylenchus penetrans的致病性。 Nematropica 39：35-46。在温室和微样条件下，都测试了小葱对葱的致病性。为了进行温室研究，将洋葱（洋葱）Tioga的幼苗分别以0、3000、6000、9000或1200头雌性+幼体/盆接种百日草。在田间微孔图中，将0、26500、53000、106000或212000雌性+百日咳对虾/微图的幼虫接种到洋葱上。进行了爱达荷州洋葱生产推荐的栽培实践，并在收获时收集了有关植物顶部和根的鲜重和干重，鳞茎直径和重量以及根和土壤中线虫种群的数据。接种量的增加导致洋葱生长明显减少，收获时线虫数量增加。从3000 P.transe /盆或26500 /微地块开始，植物生长显着减少。在田间微样中，在接种量分别为26500和212000 P. penetrans / microplot时，灯泡的重量减轻幅度为31.5％至64.2％。在温室条件下，在12000 P. penetrans /盆中，植物总干重的最大减少为84.2％。这项研究将帮助爱达荷州的洋葱种植者决定是否在土壤中具有特定密度的P. penetrans的田间种植洋葱。

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