本试验用人工剪叶方法,模拟油桐尺蠖对油桐的为害。结果表明,油桐尺蠖的为害对油桐的生长发育、产量和桐油的品质,均有不同程度的影响。为害程度(x)与产量损失率(y)之间,具有幂函数回归关系y=ax^b,按照Headley的防治指标原理,利用Chiang...本试验用人工剪叶方法,模拟油桐尺蠖对油桐的为害。结果表明,油桐尺蠖的为害对油桐的生长发育、产量和桐油的品质,均有不同程度的影响。为害程度(x)与产量损失率(y)之间,具有幂函数回归关系y=ax^b,按照Headley的防治指标原理,利用Chiang H C的防治指标计算公式,求得进行化防时,以成年树每株3龄幼虫数及卵块数为标准的防治指标分别为:第1代191.3条和1.06个印块;第2代212.8条和1.18个卵块。人工挖蛹的防治指标舞株蛹置为:第1代2.58个.第2代2.53个。展开更多
In order to improve the survival rate of planting seedlings of Phoebe zhen-nan, the grading standard for one-year-old container seedlings of Phoebe zhennan was developed by using cluster analysis. The results showed t...In order to improve the survival rate of planting seedlings of Phoebe zhen-nan, the grading standard for one-year-old container seedlings of Phoebe zhennan was developed by using cluster analysis. The results showed that the quality of Phoebe zhennan container seedlings could be estimated from seedling height and ground diameter. The Phoebe zhennan container seedlings were divided into 3 grades: Grade 1 (seedling height ≥ 38 cm; ground diameter ≥ 0.65 cm), Grade 2 (31.7 cm ≤ seedling height 〈 38 cm; 0.56 cm ≤ ground diameter 〈 0.65 cm) and Grade 3 (seedling height 〈 31.7 cm; ground diameter 〈 0.56 cm).展开更多
文摘本试验用人工剪叶方法,模拟油桐尺蠖对油桐的为害。结果表明,油桐尺蠖的为害对油桐的生长发育、产量和桐油的品质,均有不同程度的影响。为害程度(x)与产量损失率(y)之间,具有幂函数回归关系y=ax^b,按照Headley的防治指标原理,利用Chiang H C的防治指标计算公式,求得进行化防时,以成年树每株3龄幼虫数及卵块数为标准的防治指标分别为:第1代191.3条和1.06个印块;第2代212.8条和1.18个卵块。人工挖蛹的防治指标舞株蛹置为:第1代2.58个.第2代2.53个。
基金Supported by Forestry Science and Technology Program of Hunan Province(2010-06)~~
文摘In order to improve the survival rate of planting seedlings of Phoebe zhen-nan, the grading standard for one-year-old container seedlings of Phoebe zhennan was developed by using cluster analysis. The results showed that the quality of Phoebe zhennan container seedlings could be estimated from seedling height and ground diameter. The Phoebe zhennan container seedlings were divided into 3 grades: Grade 1 (seedling height ≥ 38 cm; ground diameter ≥ 0.65 cm), Grade 2 (31.7 cm ≤ seedling height 〈 38 cm; 0.56 cm ≤ ground diameter 〈 0.65 cm) and Grade 3 (seedling height 〈 31.7 cm; ground diameter 〈 0.56 cm).