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应用40%氧化乐果和辟虱蚜原液进行1次性打孔注射和2次注药防治危害杨树的杨干透翅蛾,1次注药与2次注药害虫的死亡率差异极显著,1次主药死亡率达40%,2次注药后死亡率大到85%,使用氧化乐果的效果高于辟虱蚜。 相似文献
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通过使用溴氰菊酯4个浓度药剂对松沫蝉(Aphrophora flavipes Uhler)若虫进行防治试验,结果表明:施药后1天防治效果都在70%以上,施药5 d后,2 000倍、1 000倍、500倍都在89%以上。吡虫啉3个浓度药剂的防治效果在60%~73%,树干注药初期药效较慢,注药后5 d的防治效果才达到90%以上,树干注药对其他昆虫和环境的危害较小,有利于保护生态环境。 相似文献
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利用10%的吡虫啉原液2.5 mL3、mL、3.5 mL钻孔注药防治杨树食叶害虫,防治效果分别可达83.9%、95.1%、99.5%,而且成本低,对环境无污染。 相似文献
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树干打孔注药防治危害广玉兰的日本壶链蚧 总被引:2,自引:0,他引:2
应用40%氧化乐果乳油、50%甲胺磷乳油和一针净进行树干1次性打孔注射防治危害广玉兰的日本壶链蚧,害虫死亡率达到100%;应用5%吡虫啉乳油2次注药防治该虫,死亡率低于40%;40%乐果乳油两次注药后死亡率最终达到100%,1次注药与两次注药害虫的死亡率差异极显著;除吡虫啉外其他4种药剂在打药后10 d和20 d日本壶链蚧的死亡率均有显著提高,死亡率在用药后20 d达到最高;打孔注药的防治费用较喷药防治节约70%~75%。生长正常的广玉兰新梢生长到6.7~8 cm长时,通常日本壶链蚧的若虫孵化率达到高峰。 相似文献
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几种植物源杀虫剂防治黑竹缘蝽效果分析 总被引:9,自引:8,他引:1
黑竹缘蝽是绿竹等丛生竹笋期的主要害虫,为拓宽防治黑竹缘蝽新途径,制定高效、经济、环保的防治措施,研究了5种植物源杀虫剂对黑竹缘蝽若虫的防治效果。结果表明:选用1.3%苦参碱可溶液剂、0.5%藜芦碱可溶性液剂、4%鱼藤酮乳油、1.2%烟碱苦参碱乳油、1%苦皮藤素乳油,运用弥雾机喷雾防治黑竹缘蝽若虫,药剂原药用量均为1 200 mL/hm2,药后3 d防治效果均可达90%以上,达到了有效控灾的目的。这5种药剂可用于无公害防治黑竹缘蝽若虫,试验结果可为生产上制定黑竹缘蝽若虫防治措施提供借鉴。 相似文献
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近年来,由于不合理的防治措施,黄纹竹斑蛾已成为危害毛竹叶片的主要害虫。为探索有效控制黄纹竹斑蛾危害的无公害防治措施,试验研究了不同浓度的6种植物源杀虫剂:0.5%藜芦碱可溶性液、1%苦皮藤素可溶液、4%鱼藤酮乳油、1.5%苦参碱可溶液、1.2%烟碱·苦参碱可溶液和1.1%苦参碱粉剂对黄纹竹斑蛾幼虫的防治效果,其中前5种药剂采用喷烟技术施药,后一种药剂采用喷粉技术施药。结果表明:施药后3 d,6种药剂的防治效果均达90%以上;0.5%藜芦碱可溶性液、1%苦皮藤素可溶液和4%鱼藤酮乳油的田间最佳用药浓度是原药与0号柴油容积比为1:40,用药量为1 200 mL/hm2;1.5%苦参碱可溶液、1.2%烟碱·苦参碱可溶液田间最佳用药浓度是原药与0号柴油容积比为1:9,用药量为800 mL/hm2;1.1%苦参碱粉剂田间最佳用药量为22.5 kg/hm2。上述6种植物源杀虫剂均可作为无公害防治黄纹竹斑蛾幼虫的药剂,在黄纹竹斑蛾幼虫危害时施用。 相似文献
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于广东省中山市南葫镇翠亨村木荷上采集油茶尺蠖5龄幼虫,参照Ellman et al.(1961)的方法测定高浓度(20倍液)氯胺磷处理后油荼尺蠖乙酰胆碱酯酶的活性,结果显示,20倍稀释液氯胺磷对油荼尺蠖乙酰胆碱酯酶活性的抑制率为9.09%.于鸡屎藤叶背面和藤上采集桃蚜,配制80倍、160倍、240倍、320倍、400倍氯胺磷稀释液,在实验室用喷雾法测定氯胺磷对桃蚜的毒力,结果表明:随着氯胺磷浓度的增加,其防治效果越好,稀释80倍的氯胺磷溶液在24h内桃蚜死亡率达90%. 相似文献
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本文采用竹腔注射40油防治两色绿刺蛾均有效果.注射剂量3~5 mL/株较剂量1~2 mL/株的防治效果好.竹腔注射3~5 mL/株40%氧化乐果乳油,施药5 d后,两色绿刺蛾虫口校正死亡率可达93.5%以上. 相似文献
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大量含氮、磷的污水未经处理直接排放到当地河流湖泊等自然水体中,导致湿地环境越来越恶劣,水体富营养化程度加剧,对污染水体的修复已迫在眉睫。本实验以1/5的Hoagland溶液为培养液,设置0 mL·L^-1、20 mL·L^-1、40 mL·L^-1、80 mL·L^-1、160 mL·L^-1五个铜绿微囊藻接种浓度梯度与0 mg·m^-2、100 mg·m^-2、200 mg·m^-2、400 mg·m^-2、800 mg·m^-2 5个少根紫萍接种浓度梯度进行双因素正交试验。结果发现,在0~15 d内,所有少根紫萍接种浓度和铜绿微囊藻接种浓度处理下,水体中总氮(TN)、磷(TP)含量随着接种时间的增加而降低,且铜绿微囊藻和少根紫萍共培养比各自单独培养对污染水体具有更好的修复效果。15d后测定培养液中藻毒素和少根紫萍体内藻毒素含量,结果表明少根紫萍可有效吸收培养液中的藻毒素。以上结果表明,低浓度铜绿微囊藻可促进少根紫萍生长,高浓度铜绿微囊藻抑制少根紫萍生长,少根紫萍可有效吸收培养液中的TN、TP和藻毒素。在铜绿微囊藻浓度为20 mL·L^-1、少根紫萍接种浓度为400 mg·m^-2时,浮萍生长状况最好,对培养液中TN、TP及藻毒素的去除率也达到最高。综上所述,低浓度铜绿微囊藻和100%覆盖率的少根紫萍共培养用于湿地水体修复具有良好的修复效果。 相似文献
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采用模型试验的方法对组培洗瓶机的水力洗涤工艺进行了研究,论证了水力洗涤方式完全可满足组培洗瓶的要求,确定了水力洗涤各参数对洗涤效果的影响程度,并获得了水力洗涤主要参数的较佳范围,为设计组培洗瓶机提供了理论依据。 相似文献
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Ammar Khalil Mohamed Ahmed Luping Jiang Fang Wang Song Chen Xueyan Zhou Xiaona Pei Xiyang Zhao Guanzheng Qu 《林业研究》2020,31(1):45-55
To determine appropriate quantities of water and fertilizer required for early growth of hybrid poplar cuttings,we recorded the growth traits of four clones grown under four factors(irrigation and nitrogen,phosphorus,and potassium fertilizers),each with four levels,using an orthogonal experimental design.A logistic model was used to estimate growth in height.The growth curves for tree height were sigmoid,and the model R^2 values were greater than 0.9,which indicated that the fit was highly significant.ANOVA results for tree height and basal diameter indicated that all sources of variance showed significant differences(p<0.001).The average tree height and basal diameter for all the four clones under the different treatments ranged from 155.39 to 235.04 cm,and from 13.71 to 17.42 mm,respectively.A highly positive correlation between the extreme k value and tree height was observed,suggesting that the k value was an accurate estimation of tree height.For model parameters,the earliest average time point for the onset of the rapid growth period of poplar clones was 131 d,and the highest average increment in tree height during the rapid growth period was 138.78 cm.The highest average tree height for all clones under each factor was 219,210.51,200,and 201 cm when treated with either 1200 mL of water applied every third day,3 g of nitrogen,0 g of phosphorus,or 0 g of potassium,respectively.The most suitable treatment for the early growth of hybrid poplar cuttings,as suggested by the developed logistic model,was 1200 mL of water applied every third day and three applications of 1 g nitrogen(in the form of CH4N2O). 相似文献
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Abstract Surface treatment of bamboo was carried out by microwave plasma (MWP), surface contact angle of the sample was measured
using glycerin and urea-formaldehyde resin (UFR) liquid, and the effects on the surface performance of the bamboo sample was
evaluated. The results show that the surface contact angle of the sample presented a generally decreasing trend when prolonging
the MWP treatment time and shortening the distance between the sample and the resonance cavity. The surface contact angle
of the sample decreased by 49%–59% under the following conditions: MWP treatment for 30 s, the distance between the sample
and resonance cavity at 40 mm, and measurement at 15 s after dripping with glycerin. The surface contact angle of the sample
measured with the glycerin was lower than that with UFR. No matter whether we used glycerin or UFR, the contact angle of the
sample at 15 s after dripping was lower than that at 5 s after dripping. The grinding treatment had little effect on the surface
contact angle of the sample after MWP treatment, and the modification effect ofMWP treatment after grinding was better than
that of sole MWP treatment.
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Translated from Journal of Nanjing Forestry University (Natural Sciences Edition), 2007, 31(4): 33–36 [译自: 南京林业大学学报(自 然科学版)] 相似文献