共查询到16条相似文献,搜索用时 78 毫秒
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毛竹林环境因子与一字竹笋象危害关系的研究 总被引:1,自引:0,他引:1
1991~1993年调查发现,一字竹笋象在龙游县年发生面积近0.54万hm2,为毛竹林的一种主要笋期害虫,该虫的发生与危害主要在海拔600m以下的竹林内,阳坡为害重于阴坡,花年竹林明显重于大小年竹林,对竹林垦复可减轻为害程度。 相似文献
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竹笋万纹象成虫种群空间结构研究 总被引:1,自引:0,他引:1
分别对不同经营类型毛竹林在不同竹笋生长时期进行竹笋万纹象成虫种群密度调查 ,并应用 4种统计模型拟合其种群的空间结构和分析其变动规律 ,结果表明 :花年竹林分竹笋万纹象空间模型为球型 ,其空间相关距离为 4 4 9m ,异质系数为 6 8m ,空间依赖度为 4 8 6m ;大小年明显林分则为指数型 ,空间相关距离为 3 12m ,异质系数为 6 6m ,空间依赖度为117 6m。上笋初期与危害后期空间结构为线型 ,异质系数分别为 16 4m、17 3m ;危害高峰期为球型 ,空间相关距离为3 32m ,异质系数为 6 3m ,空间依赖度为 13 4m。竹笋万纹象种群空间结构的差异性为生产上林间虫情调查及喷药防治采取不同策略提供了依据 相似文献
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一字竹象虫防治方法试验研究 总被引:3,自引:0,他引:3
一字竹象虫成虫期(篌竹林内),用2.5%溴氰菊酯乳剂每亩5~10ml,喷雾二次(二次间隔为5~7天),防治效果可达90%以上,用40%SN—851每亩100ml或25%菊乐合酯每亩150ml喷雾,24小时平均药效达100%。一字竹象虫幼虫期(毛竹林内),在笋高1.5~2m时,用50%甲胺磷乳油原液,每株0.5ml,进行竹腔注射,平均防效97.2%。经大面积推广应用,防治效果好,经济效益明显。 相似文献
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竹笋象危害对竹材物理力学性质的影响 总被引:4,自引:0,他引:4
对受笋万纹象(Otidognathus rubriceps Chevrolot)、一字竹笋象(O.davidis Fairmaire)、大竹笋象(Cyrtatrachelus longimanus Fabricius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗弯弹性模量和顺纹抗拉强度测定结果表明,与正常毛竹相比较,受竹笋象危害断梢毛竹差异显著,3个竹材物理力学性质指标分别下降了43.79%、39.01%、29.28%,竹腔注药防治后毛竹3个指标下降了13.87%、10.95%、9.01%,但差异不显著,不影响竹材的使用价值. 相似文献
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用塑料薄膜筒袋套袋、药剂等进行了防治方法比较试验,结果表明,不采取任何防治措施的对照根本无正常新竹,96.67%的竹材使用都受到影响;在笋期喷淋乙酰甲胺磷、绿色威雷药剂防治效果明显,正常新竹比例高达93%以上,无中度以上危害新竹,新竹生长正常;在生产香菇过程中使用过的长度60cm塑料薄膜筒袋笋尖套袋防治效果与乙酰甲胺磷、绿色威雷药剂防治效果相当,正常新竹比例达80%左右,无中度以上危害新竹,新竹生长正常;长度60cm以下塑料薄膜筒袋笋尖套袋防治效果不佳与其长度不够有关. 相似文献
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竹笋万纹象发生期预测预报技术研究 总被引:1,自引:0,他引:1
1998~2002年在福建省永安市对竹笋万纹象成虫上笋高峰期、老熟幼虫的下地高峰期与毛竹出笋高峰期、留笋平均高、新竹展枝进度等物候关系进行系统观察,结果表明,采用产笋高峰期预测竹笋万纹象成虫上笋危害高峰期,两者之间期距为8 d;建立的预测模型Y=5.6-0.023 6X(式中:Y为当日与成虫上笋高峰日期距,X为留笋平均高)可以预测成虫上笋高峰期,其误差在2 d以内;以新竹第3轮新枝展开30%预测老熟幼虫下竹高峰期,经检验预测误差为1 d。 相似文献
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竹笋万纹象综合防治技术研究 总被引:3,自引:0,他引:3
The result of integrated control against Otidognathus rubriceps was reported in the paper. Spraying the bamboo at 9~10 am. during the peak of the adult who oviposited going up to the bamboo, adopting the 20% of the emulsifiable solution of fenvalerate 1000 time'solution, spraying again after 5 days, the control effect was higher than 90 percent. The highest rate of infecting the larva with insect's pathogenic nematode in lab was Steinernema carpocapsae Beijing, the corrected mortality was 51.35% after 10 days when it was treated. The control effect reached 42.56~66.08% if it was sprayed by different strains of nematodes in the dosage of 2 x 105 ~m-2 on the ground of forest. Beauveria bassiana had a poor infected effect on the larva,which is 32.43% of corrected mortality after 15 days. Spraying the power of B. bass/ana on the ground before the larva going down could reduce the new bamboo's injured rate by 12.52% the next year, and reached 29.21% of control effect. Shaking the tips before the peak of the larva going down could reduce the hibernating population, the control effect reached 89.44%. The adult was caught by manual, comparing with the comparative stand, the injuring rate of the one-year-old bamboo declined by 43.74% and the control effect was 64.50%. Reclaiming the land deeply had a certain effect on Otidognathus rubriceps in winter, but it was better doing it after the larva going down (in the middle of May), the injuring rate of the one-year-old bamboo descented by 60.00%, and control effect was 87.84%. 相似文献