Reay-Jones F P F, Way M O, Sétamou M, Legendre B L, Reagan T E
Department of Entomology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
J Econ Entomol. 2003 Dec;96(6):1929-34. doi: 10.1093/jee/96.6.1929.
A 2-yr study to evaluate Louisiana and Texas sugarcane, Saccharum spp., cultivars for resistance to the Mexican rice borer, Eoreuma loftini (Dyar) was conducted in two locations in Texas, chosen for having different infestation levels. Criteria for assessment of resistance included percentage of bored internodes and adult emergence holes, the latter used to determine the relative impact of each cultivar on the potential areawide buildup or reduction of adult E. loftini populations. A recently released cultivar, HoCP 85-845, seemed to lose a portion of its resistance under heavy E. loftini infestation pressure, suggesting its value only in moderate-to-low infestation conditions. Cultivar CP 70-321 was the most resistant. Results indicated that cultivar LCP 85-384 was significantly (P < 0.05) more susceptible than NCo 310, traditionally the most susceptible cultivar commercially produced in Texas. In 2001, LCP 85-384, which now represents 85% of the production area in Louisiana, had the greatest moth production per hectare (17,052 +/- 3,956) under the lower infestation pressure, significantly (P < 0.05) higher than HoCP 85-845 (3,038 +/- 2,353). In a portion of the test at the high-infestation location, high levels of sodium and magnesium salt stress (15-30-cm soil depth) were associated with higher E. loftini damage in all cultivars except HoCP 91-555 and CP 70-321.
开展了一项为期两年的研究，以评估路易斯安那州和得克萨斯州的甘蔗品种（甘蔗属）对墨西哥稻螟（Eoreuma loftini (Dyar)）的抗性，研究在得克萨斯州的两个地点进行，这两个地点因虫害水平不同而被选中。抗性评估标准包括受蛀节间百分比和成虫羽化孔数量，后者用于确定每个品种对成虫墨西哥稻螟种群潜在的区域范围内增长或减少的相对影响。一个最近发布的品种HoCP 85 - 845在墨西哥稻螟的严重虫害压力下似乎丧失了部分抗性，这表明它仅在中低虫害条件下有价值。品种CP 70 - 321抗性最强。结果表明，品种LCP 85 - 384比NCo 310显著更易感（P < 0.05），NCo 310传统上是得克萨斯州商业生产中最易感的品种。2001年，目前占路易斯安那州种植面积85%的LCP 85 - 384在较低虫害压力下每公顷的蛾产量最高（17,052 ± 3,956），显著高于HoCP 85 - 845（3,038 ± 2,353）（P < 0.05）。在高虫害地点的部分试验中，除HoCP 91 - 555和CP 70 - 321外，所有品种中高水平的钠和镁盐胁迫（土壤深度15 - 30厘米）与更高的墨西哥稻螟危害相关。
