共查询到20条相似文献,搜索用时 78 毫秒
1.
樟子松红斑病材积损失率随病情指数呈直线形的变化,利用田间防治筛选出的4种化学药剂进行防治效果试验,最后确定防治的经济阈值的病情指数为20,防治指标的病情指数为29。 相似文献
2.
3.
板栗枝枯病由真菌中的半知菌类,黑盘孢目,棒盘孢属的一个变种或专化型侵染所致,在河南尚属首次发现。病原菌在枝干,表皮下球苞病组织内越冬,翌年环境条件适宜时繁殖分生了,由昆虫传播,7-8月发病盛期。 相似文献
4.
5.
对核桃枝枯病的病症及发病规律作了简要介绍,对这一病害严重的核桃园进行了三年的防治试验。通过全园耕翻、除草、剪枯枝、施肥及喷施代森锰锌的综合措施,使大小枝的枝枯率从试验前的43.3%和44.9%下降为3.4%和4.3%,症状基本消除。园地土壤有机质和氮含量明显增加,树冠恢复并扩展,产量显著增加 相似文献
6.
山核桃枝枯病(Melanconium oblongum Berk.)始发于8月中下旬,盛发于10~11月。病菌侵染1年生枝梢和2年生侧枝,并向下蔓延引起大枝条枯死。发病初期症状不明显,后期枝梢顶芽干缩,枝条内部变褐坏死,死皮上产生小黑点即为病菌的分生孢子盘。分生孢子在25℃下发芽率最高,低于10℃不能发芽。在pH3~11范围内都能发芽。病菌以菌丝体和分生孢子在病枯枝上过冬。 相似文献
7.
10种杀菌剂对花椒枝枯病室内毒力测定及田间防治试验 总被引:2,自引:0,他引:2
采用孢子玻片萌发法做了10种杀菌药剂对花椒枝枯病的室内毒力测定,初选出7种对花椒枝枯病分生孢子较敏感的药剂参加田间防治试验。结果表明:代森铵、退菌特、代森锰锌喷雾防治效果显著,以45% 代森铵100倍液防治效果为好、平均防效可达925% ;多菌灵采用高压注射、根埋防治也可取得818% 以上的良好防效。 相似文献
8.
落叶松落叶病经济管理中,快速评估病害造成的损失,核定防治后的经济效益,是对其进行综合管理的重要部分,文中一系列模型和表格,对防治经济效益的评估,避免盲目投资有一定的参考价值。 相似文献
9.
10.
通过对正常生长区和发病区火炬松单株材积和当年生新梢生长量调查,经数理统计分析表明,正常生长区和发病区单株材积差异这极显著水平;当年生新梢生长量损失率达87.20%~94.94%,使5~6年生幼林每年每亩材积生长量较正常生长量(0.4~0.72m~3)减少0.35~0.66m~3。 相似文献
11.
12.
苏铁镰刀菌球茎腐烂病化学防治技术研究 总被引:1,自引:0,他引:1
林间调查结果表明:德葆苏铁Cycas debaoensis、四川苏铁C.szechuanensis、十万大山苏铁C.shiwandashanica为苏铁镰刀菌Fusarium solani球茎腐烂病易发病种类;海南苏铁C.hannanensis、元江苏铁C.parvulus和叉叶苏铁C.micholitzii是中等感病品种;越南苏铁C.tonkinensis、贵州苏铁C.guizhouensis、叉孢苏铁C.segmentifida、攀枝花苏铁C.panzhihuaensis、仙湖苏铁C.fairylakea、石山苏铁C.miquelii、单羽苏铁C.simplicipinna、多羽苏铁C.mutltiflrondis为较抗病品种;苏铁C.revoluta和鳞秕苏铁Zamia purouracea是高度抗病品种.在空气干燥的月份,以切除病部+75%酒精表面消毒+涂上含有杀虫剂的50%多菌灵WP处理最好,防治效果100%.在雨水多的月份,以切除病部+75%酒精表面消毒+涂上含有杀虫剂的50%多菌灵粉剂+透光防雨罩处理最好,防治效果83.3%.在化学防治过程中,关键要做到病部切除彻底、表面消毒彻底、防治用的药剂充足,避免后期新伤口产生,才能有效地治疗发病苏铁. 相似文献
13.
14.
Shailesh Pandey R Raja Rishi RSC Jayaraj Krishna Giri Rajesh Kumar Amit Pandey Ranjana Juwantha Sheeba Madaan Maneesh S. Bhandari 《Forest Pathology》2019,49(2)
Aquilaria malaccensis, categorized by IUCN as globally vulnerable, is in high demand in the Middle East and Asian markets for its unique resinous agarwood. In August 2015, symptoms of dieback were observed on A. malaccensis trees planted in the Medicinal and Aromatic Plant Garden, Panbari, Golaghat of the Assam Forest Department. The entire crowns of 70 trees showed complete leaf loss and severe dieback. Rotting at the collar region and of roots was also observed. Isolation from the infected roots consistently yielded Fusarium equiseti identified following standard laboratory procedures and analysis of the internal transcribed spacer (ITS) sequence of the ribosomal DNA. Symptoms of wilt, dieback and root rot were observed on 5‐month‐old Aquilaria seedlings 25 days after inoculation with the isolated fungus. This paper is the first report of F. equiseti causing wilt and dieback of A. malaccensis. 相似文献
15.
16.
T. Kowalski 《Forest Pathology》2006,36(4):264-270
A new species of the hyphomycete genus Chalara is described. It has been frequently isolated from stems and branches and sometimes also from roots of wilting and dying Fraxinus excelsior in Poland. It differs from previously described species of Chalara by its small, short cylindrical phialoconidia extruded in chains or in slimy droplets, morphological features of the phialophores and by colony characteristics. It is non‐tolerant to cycloheximide. 相似文献
17.
A. N. Shukla 《Forest Pathology》2008,38(6):410-418
Large‐scale dieback of Dalbergia sissoo trees in India and neighbouring countries is causing concern to the state forest departments and farmers as trees of all age group are dying. Fusarium solani f.sp. dalbergiae, isolated from the roots of dying trees and from the oozing pitch on stems, was tested for pathogenicity. Seeds were collected from 107 mature healthy trees, from 21 heavily infected localities in the country. As many seed failed to germinate, resistance testing was carried out on a limited number of provenances. Seedlings were tested for disease resistance by soil drenching and root‐dip methods using spore suspensions of F. solani f.sp. dalbergiae. On the basis of seedling survival, provenances were classified into four susceptibility classes; seedlings from Amritsar (Punjab) showed maximum survival and were considered very resistant, whereas Dehra (Kangra), Himachal Pradesh, were the most susceptible. F. solani f.sp. dalbergiae from Nihal Gate (Haldwani), Uttarakhand, was the most virulent isolate amongst the three tested. 相似文献
18.
垂柳瘿叶蜂的发生及防治 总被引:1,自引:0,他引:1
针对垂柳瘿叶蜂Pontaniasp.在辽宁的发生、危害情况,观察了该虫生物学特性并进行了防治试验,为有效地控制其发生和危害提供了科学依据。 相似文献
19.