| 张蓉1,杨芳1,先晨钟2,马建华1,张社会2.蓟马危害苜蓿的产量损失及防治指标研究[J].植物保护,2005,31(1):47-49. |
| 蓟马危害苜蓿的产量损失及防治指标研究 |
| A study on the yield loss and economic threshold of alfalfa damaged by thrip, Odentothrips lati |
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| DOI： |
| 中文关键词: 农业昆虫学 蓟马 苜蓿 产量损失 防治指标 |
| 英文关键词:agricultural entomology Odentothrips lati alfalfa yield loss economic threshold |
| 基金项目: |
| 张蓉1 杨芳1 先晨钟2 马建华1 张社会2 |
| 1.宁夏农业科学院植物保护研究所 宁夏银川750002;2.宁夏固原市草原站 宁夏固原756000 |
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| 中文摘要: |
| 采用人工接虫的方法,研究了蓟马的虫口密度与苜蓿产量损失之间的关系和防治指标。结果表明,苜蓿干草产量损失率(Y)与20枝条虫量(X)的关系为Y=0.1021X-2.2461,相关系数r为0.9874,两者相关性极显著。按照防治的直接收益与成本,确定了宁夏旱地苜蓿和水地苜蓿蓟马的防治指标,即旱地苜蓿蓟马第1茬的防治指标为560头/100枝条,水地苜蓿蓟马第2茬的防治指标为390头/100枝条,第3茬的防治指标为580头/100枝条。 |
| 英文摘要: |
| The tests on the damage and economic threshold of alfalfa was carried out by artificially modifying the density of thrip, Odentothrips lati.A correlation formula between thrip population density per 20 stems (X) and yield loss rate of dried hay (Y) was created as follows: Y=0.1021X-2.2461, r=0.9874.Based on the direct benefits and control costs, the economic thresholds in controlling thrips under various field conditions were determined as follows: 560 thrips per 100 stems of the first cutting alfalfa in dry fields; 390 thrips per 100 stems of the second cutting alfalfa and 580 thrips per stems of the third cutting alfalfa in irrigated fields. |
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