苎麻天牛幼虫影响苎麻产量构成因素的通径分析

Path Analysis of Ramie Yield Components Z Effected by Larva of Ramie Longicorn

１９９８年对苎麻天牛幼虫在自然条件下危害苎麻产量的构成因素进行通径分析，结果表明，百蔸虫量对产量损失直接作用最大（Ｐｘ１→ｙ＝０．７８２６）；百蔸虫量主要通过株高及鲜皮厚间接影响产量，而通过茎粗、有效株及出麻率对产量损失率有微弱的负效应。

The ramie yield componente effected by larva of ramie longicorn were studied by means of path analysis under the natural condition in 1998. The results showed that the larva number per hundred clump was a main directive factor (Px1y=0.7826), which reduced the ramie yield by effecting the plant height and fresh bast thickness. Whereas, the faint negative effectiveness to yield loss was from the stem diameter, ratios of effective plants and fresh bast fibre.