几个木麻黄无性系抗木毒蛾试验

报道了几个木麻黄无性系抵抗木毒蛾危害的试验。结果表明:木麻黄无性系具有较高的抗木毒蛾能力,苗期,对照的虫株率(18.4%)是木麻黄4个无性系平均虫株率(1.9%)的9.68倍;幼林期,对照的虫株率(34.2%)是4个无性系平均虫株率(2.8%)的12.21倍,对照的虫口密度(16.966只.株-1)是无性系平均虫口密度(0.0355只.株-1)的477.92倍;成林时,敖东镇对照的虫株率(63.6%)是无性系P10-33虫株率(1.8%)的35.33倍,流水镇对照的虫株率(65.0%)是无性系P10-33虫株率(2.0%)的32.50倍,在敖东镇和流水镇,木麻黄无性系P10-33的虫株率分别是1.8%和2.0%,差异不显著。

Experiment of resistance to Lymanrtia xylina in several Casuarina equisetefolia clones

This paper reports the experiment of resistance to Lymantria xylina in several Casuarina equisetefolia clones.The results indicated that the C.equisetefolia clones were higher in resistance to L.xylina.At seedling stage,the ratio of infested trees of the control(18.4%) was 9.68 times as much as the average ratio of infested trees of the 4 clones of C.equisetefolia(1.9%).At young plantation stage,the ratio of infested trees of the control(34.2%) was 12.21 times as much as the average ratio of infested trees of the 4 clones of C.equisetefolia(2.8%).The population density of the control(16.966 insect per tree) was 477.92 times as much as the average population density of the 4 clones(0.0355 insect per tree).At grown plantarion stage,at Aodong Town,the ratio of infested trees of the control(63.6%) was 35.33 times as much as the ratio of infested trees of the clone P10-33(1.8%),at Liushui Town the ratio of infested trees of the control(65.0%) was 32.50 times as much as the ratio of infested trees of the clone P10-33(2.0%),at Aodong Town and Liushui Town,the ratio of infested trees of C.equisetefolia clone P10-33 was 1.8% and 2.0% respectively,the ratios of infested trees of clone P10-33 were not significantly different between two towns.