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为了筛选金叶女贞褐斑病预防与防治适宜药剂,开展了金叶女贞褐斑病药剂防治试验,结果表明:所选的5种药剂均对褐斑病有较好的防治效果,其中70%百菌清悬浮剂800倍液、70%甲基托布津1 000倍液的防治效果最佳,发病率为0;预防实验中以70%百菌清悬浮剂800倍液的效果最佳。建议在金叶女贞发生褐斑病之前喷施70%百菌清悬浮剂800倍液预防,发病后喷施70%百菌清悬浮剂800倍液、70%甲基托布津1 000倍液等进行防治。 相似文献
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银杏树的主要病害有银杏树叶枯病和干腐病,均为真菌性病害。叶枯病可在生长前期用25%的多菌灵500倍液或70%的甲基托布津600倍液喷布2~3次,并及时清除落叶烧毁。干腐病的防治可参照苹果。主要虫害有天牛、蓑蛾、蓟马和卷叶蛾。蓟马为害银杏树幼嫩叶片,可在生长前期喷2.5%的敌杀死乳油2000倍液或20%的速灭杀丁(杀灭菊酯)乳油3000倍液,也可用40%的乐果或氧化乐果乳油1000~1500倍液进行防治。卷叶蛾幼虫初夏缀叶蛀食,可人工摘除虫苞、卷叶,在成虫发生时挂糖醋罐诱杀,或喷50%的辛硫磷乳油1000倍液防治。 相似文献
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通过对合欢溃疡病危害症状、流行特点和发生规律开展详细调查研究,及8种药剂试验筛选,表明40%福美砷、50%福美双、70%甲基托布津和50%多菌灵治愈效果较好.通过刮除病斑后涂药和在病斑上直接涂药2种施药方法比较,前者取得更理想的防治效果,其中40%福美砷、70%甲基托布津100倍液药防治效果分别高出18.1%,10.4%.并实施营林综合防治方法,纯片林病害发生率最为严重,多行混交林带次之,单行纯林带较轻. 相似文献
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以不同药剂、不同浓度、不同处理方法对马占相思白粉病进行野外防治试验,并对结果作方差分析,结果表明:甲基托布津70%可湿性粉剂的1 000~2 000倍液对马占相思白粉病有良好的防治效果,相对防效达90%以上;马占相思白粉病野外化学防治以甲基托布津70%可湿性粉剂1 000倍液 粉锈宁15%可湿性粉剂1 000倍液 腈菌唑12.5%可湿性粉剂3 000倍液常规喷雾防治为佳。 相似文献
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国外松枯梢病防治试验 总被引:2,自引:0,他引:2
对国外松枯梢病作施硼和药剂防治试验,晶体硼砂30克/株的效果最好,平均防治效果80.4%,其次是2;2:100波尔多液为76.5%,40%多菌灵400倍液为59.3%,70%甲基托布津400倍液为59%,营林措施防治效果为65.8%-66.2%。 相似文献
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以川中丘陵区"带状采伐+补阔"试验基地作为研究对象,调查其林下天然更新情况。结果表明:(1)采伐带、保留带天然更新的幼树幼苗明显高于对照样地(P<0.05)。10m、8 m、6 m、4m采伐带、保留带的天然更新幼树幼苗分别是对照的10.63倍、9.38倍、7.92倍、7.50倍和3.33倍、3.75倍、4.38倍、6.04倍。(2)采伐带、保留带、对照样地内的更新幼树幼苗的树高均显现为左偏单峰结构,且均以树高≤0.1m的幼苗数量最多。不同带宽采伐带和保留带内天然更新的幼树幼苗高度分级占比不尽相同。(3)所有处理下的天然更新的幼树幼苗均呈聚集状分布的状态,且聚集强度较大。(4)除柏木外,天然更新的树种种类多以香樟、香椿、乌桕等喜阳或半喜阳的为主。 相似文献
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绿巨人褐腐病化学防治试验 总被引:2,自引:0,他引:2
用29种杀菌剂对绿巨人褐腐病病原菌进行室内毒力测定,结果显示:25%健绿宝、70%代高乐、40%百可宁、50%消菌灵、72%克露、70%百德富、25%绿乳铜和70%土菌消8种药剂对绿巨人病株叶柄病斑和根部感染具强烈抑制作用。用这些杀菌剂进一步进行室外防治试验,对绿巨人叶柄、根部接种防治试验和对自然感染防治试验结果都表明,最理想的防治药剂为健绿宝。代高乐、百德富、新万生和土菌消也有明显的抑制效果,但百德富药效不太稳定。无伤口接种病菌不能侵入,而植株一旦受到创伤,喷淋杀菌剂在24h内都不能阻止病菌的接触侵入,接种前或后喷药都不能有效根除病菌的侵染;所以防止人为创伤、虫伤、自然风雨伤是防病的重要措施。 相似文献
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6种药剂对枸杞炭疽病的防治效果及其残留量的比较 总被引:1,自引:0,他引:1
为了筛选针对枸杞炭疽病的高效低残留农药,选用戊唑醇等6种药剂,就其药效及农药残留情况进行了田间比较试验。结果表明:施药后第7天,43%戊唑醇(SC)2 000倍液、40%氟硅唑(EC)6 000倍液、50%异菌脲(WP)1 000倍液、25%嘧菌酯(SC)1 000倍液、25%苯醚甲环唑(EC)1 000倍液和50%多菌灵(WP)500倍液对枸杞炭疽病的防治效果分别为97.00%、76.67%、69.33%、59.00%、56.00%和28.67%,施药后第10天的防治效果分别为92.50%、65.55%、47.41%、45.59%、45.44%和6.44%;戊唑醇的防治效果最好,氟硅唑次之。枸杞干果中戊唑醇的残留含量为2.60 mg·kg-1,低于最大残留限量;氟硅唑的残留含量为0.16 mg·kg~(-1),高于最大残留限量。6种试验药剂中只有戊唑醇符合高效低残留农药的筛选标准,可用于采果期枸杞炭疽病的防治。 相似文献
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森林生物量是森林生态系统的最基本数量特征,是研究许多森林问题和生态问题的基础。本试验以木兰林管局龙头山林场道坝子营林区华北落叶松低效林为研究对象,通过野外调查和室内测定相结合的方法,对其乔木生物量进行研究。结果表明:(1)随着密度的变化,上坡位密度达到大约800株/hm^2时,林分生物量和单木生物量达到最大47 000kg/hm^2和50kg;中坡位生物量则单调下降;下坡位最低生物量出现在300株/hm^2。(2)上坡位单木生物量为39.65kg、中坡位40.18kg、下坡位72.31kg,呈上升趋势。而林分内生物量则相反。(3)不同坡位单木各器官生物量相比,单木的叶、枝生物量均在下坡位取得最大比重,干生物量在上坡位取得最大比重(0.83)。 相似文献
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We analyzed the inhibition rates of eight kinds of fungicides to the pathogen of verticillium wilt of smoke tree (Cotinus coggygria) by measuring mycelium growth. Results show that four fungicides (Weijunjing, thiophanate-methyl 70% WP (wettable powder),
carbendazim 50% WP and Junxianwei) have the best antifungal effects. Three fungicides, Weijunjing, carbendazim 50% WP and
Junxianwei, were selected to determine the control of verticillium wilt in potted smoke tree seedlings. We found that the
relative efficacy of Weijunjing was up to 74%. Based on the results, Weijunjing and carbendazim 50% WP were prepared for field
trials. The results indicate that the relative efficacy of Weijunjing (300 times diluted) and carbendazim 50% WP (400 times
diluted) were 66.2% and 48.9% in plot 1 and 26.4% and 31.8% in plot 2 after soil disinfection, and were 224% and 61.8% in
plot 3 without soil disinfection in 2007. The relative efficacy of Weijunjing and carbendazim 50% WP were 49.6% and 45.4%
in plot 2 in 2008. 相似文献
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Epidemiological studies of white pine blister rust on limber pine require a temporal component to explain variations in incidence of infection and mortality. Unfortunately, it is not known how long the pathogen has been present at various sites in the central Rocky Mountains of North America. Canker age, computed from canker length and average expansion rate, can be used to estimate infestation origin and infection frequency. To investigate relationships between canker lengths and canker ages for limber pine, we collected live white pine blister rust branch and stem cankers from three locations in Wyoming and two locations in Colorado. We quantified relationships between various measures of canker length and an estimate of canker age based on dendrochronological analysis. Total branch canker length was strongly, negatively correlated (r = ?0.79) with the first year of incomplete, annual ring formation (canker age). Mean longitudinal canker expansion rate was 8.4 cm year?1 for branch and stem cankers where branches distal to the canker were either dead or alive. Annual longitudinal canker expansion, however, was significantly greater on a stem or branch where the portion distal to the canker was alive (11.5 cm year?1) rather than dead (7.1 cm year?1). For branches or stems, proximal expansion rate (i.e., toward or down stem) averaged 4.9 cm year?1. The circumferential canker expansion rate (around branch or stem) was greater for stem cankers (8.3 cm year?1) than for branch cankers (6.2 cm year?1). Additional site and host tree covariates did not improve prediction of canker age. Two simple linear equations were developed to estimate a canker age from total length of a canker with the distal portion either alive or dead. An appropriate sample of canker ages can be used to determine how long a limber pine stand has been infested with white pine blister rust and how frequently infections have occurred. 相似文献
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江苏杨树烂皮病发生状况调查及化学防治试验 总被引:1,自引:0,他引:1
通过对江苏省杨树烂皮病发生状况调查发现,在新沂,六合和仪征3个地区有杨树烂皮病发生。在调查的4 417株杨树中,平均发病率占11.32%;杨树烂皮病的发生与树种、树龄、地形、土壤、坡向以及虫害的关系均较密切。苗圃内不同药剂、配比度对杨树苗刮皮后的涂药试验发现,吡唑醚菌酯500,1 000,1 500倍液3种配比度的防治效果均在88%以上,嘧菌酯500倍液的防治效果高于80%。说明在苗圃用吡唑醚菌酯1 000倍和1 500倍液防治杨树烂皮病,可以取得良好的防治效果。 相似文献