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Population Trends of the Sugarcane Borer (Lepidoptera: Crambidae) in Louisiana Sugarcane
Environmental Entomology ( IF 1.8 ) Pub Date : 2020-10-31 , DOI: 10.1093/ee/nvaa127
B E Wilson 1 , W H White 2 , R T Richard 2 , R M Johnson 2
Affiliation  

The sugarcane borer, Diatraea saccharalis (F.) (Lepidoptera: Crambidae), is the primary pest of sugarcane, Saccharum spp., in Louisiana. Spring populations are not considered economically damaging, but quantifying infestations can provide an indication of the spatial and temporal character of the damaging summer populations. Statewide surveys quantified the density of sugarcane tillers killed by D. saccharalis (deadhearts) from sugarcane fields across the state in spring from 2003 to 2020. Deadheart density varied greatly among years with a high of 1,318/ha in 2003 to a low of 0/ha in 2018. Linear regressions of the 3-yr rolling average showed declines in spring D. saccharalis populations and the percentage of acreage treated with insecticides over 17 yr. Weather factors including minimum winter temperatures and average spring temperatures were poor predictors of D. saccharalis populations. Only total precipitation in the month of April was positively correlated with numbers of deadhearts per hectare. Results suggest overwintering mortality is not a key factor influencing populations of the first generation of D. saccharalis in Louisiana. Total precipitation in the month of July was positively associated with percentage of treated acreage. Spring deadheart density was directly related to percentage of acreage treated with insecticides during the summer. Quantifying first-generation D. saccharalis populations by recording deadheart density can aid in predicting pest pressure later in the growing season.

中文翻译:

路易斯安那州甘蔗螟(鳞翅目:蟹科)的种群趋势

甘蔗蛀虫 Diatraea saccharalis (F.)(鳞翅目:Crambidae)是路易斯安那州甘蔗 Saccharum spp. 的主要害虫。春季种群不被认为具有经济破坏性,但量化侵扰可以提供破坏性夏季种群的空间和时间特征的指示。全州范围的调查量化了 2003 年至 2020 年春季全州甘蔗田被 D. saccharalis(死心)杀死的甘蔗分蘖的密度。死心密度在各年间差异很大,2003 年高达 1,318/公顷,低至 0 2018 年的公顷。3 年滚动平均值的线性回归显示,17 年来春季 D. saccharalis 种群和用杀虫剂处理的面积百分比下降。包括最低冬季温度和平均春季温度在内的天气因素对 D. saccharalis 种群的预测较差。只有 4 月份的总降水量与每公顷死亡人数呈正相关。结果表明,越冬死亡率不是影响路易斯安那州第一代 D. saccharalis 种群的关键因素。7 月份的总降水量与处理面积的百分比呈正相关。春季死心密度与夏季使用杀虫剂处理的面积百分比直接相关。通过记录死心密度来量化第一代 D. saccharalis 种群可以帮助预测生长季节后期的害虫压力。只有 4 月份的总降水量与每公顷死亡人数呈正相关。结果表明,越冬死亡率不是影响路易斯安那州第一代 D. saccharalis 种群的关键因素。7 月份的总降水量与处理面积的百分比呈正相关。春季死心密度与夏季使用杀虫剂处理的面积百分比直接相关。通过记录死心密度来量化第一代 D. saccharalis 种群可以帮助预测生长季节后期的害虫压力。只有 4 月份的总降水量与每公顷死亡人数呈正相关。结果表明,越冬死亡率不是影响路易斯安那州第一代 D. saccharalis 种群的关键因素。7 月份的总降水量与处理面积的百分比呈正相关。春季死心密度与夏季使用杀虫剂处理的面积百分比直接相关。通过记录死心密度来量化第一代 D. saccharalis 种群可以帮助预测生长季节后期的害虫压力。7 月份的总降水量与处理面积的百分比呈正相关。春季死心密度与夏季使用杀虫剂处理的面积百分比直接相关。通过记录死心密度来量化第一代 D. saccharalis 种群可以帮助预测生长季节后期的害虫压力。7 月份的总降水量与处理面积的百分比呈正相关。春季死心密度与夏季使用杀虫剂处理的面积百分比直接相关。通过记录死心密度来量化第一代 D. saccharalis 种群可以帮助预测生长季节后期的害虫压力。
更新日期:2020-10-31
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