搜索结果: 106-120 共查到“知识库 杂草防治”相关记录492条 . 查询时间(4.178 秒)
转基因抗虫耐除草剂(Cry1Ac+EPSPS)玉米对草甘膦耐受性研究
抗虫耐除草剂玉米 存活率 耐受性 ELISA
2017/11/10
将具有我国自主知识产权的抗虫、耐除草剂基因转化到玉米中获得兼具抗虫和耐除草剂的复合性状转基因玉米, 实现了玉米复杂性状的有效改良, 研究了转耐除草剂CC-2基因和可表达Bt毒素的cry1Ac基因的双抗玉米对除草剂的耐受性及目标蛋白表达量。通过调查喷施除草剂后玉米植株存活率及株高和生长发育情况, 研究了转抗虫耐除草剂基因玉米‘CC-2×BT799’、抗虫玉米‘BT799’、耐除草剂玉米‘CC-2’,...
玉米田主要杂草对烟嘧磺隆的抗性
烟嘧磺隆 玉米田杂草 抗药性
2017/11/21
为明确我国玉米田杂草对烟嘧磺隆的抗性水平及分布现状, 于2010—2011年自山东、吉林、四川、河北4省采集连续多年施用烟嘧磺隆的玉米田杂草种子样本121个, 在温室内采用盆栽法测定了其对烟嘧磺隆的抗性。结果显示: 4个杂草样本对烟嘧磺隆产生了抗性, 其中山东淄博张店区傅家镇高家村的牛筋草抗性种群的GR50为25.76 g/hm2, 是敏感种群(1.33 g/hm2) 的19.37倍, 已产生明显...
草茎点霉毒素Ⅲ衍生物的合成与除草活性
草茎点霉 苯甲酸酯 合成 除草活性
2016/3/17
为了提高草茎点霉毒素Ⅲ(2-甲基-3,5-二硝基苯甲酸甲酯)的除草活性,对其结构进行衍生优化。以邻甲基苯甲酸为起始原料,经硝化、酯化等反应合成了34个新的苯甲酸酯类化合物,其结构均通过IR、1H NMR和GC-MS确证。杂草种子萌发试验结果表明,目标化合物对供试杂草根的抑制率明显高于茎,在100 μg/mL时,4-15、4-16和4-26对反枝苋Amaranthus retroflexus根的抑制...
为了筛选出适宜在寒地粳稻本田使用的除草剂, 采用田间小区试验进行了3种除草剂2个施用剂量对水稻生理指标影响的试验, 结果表明:3种除草剂对水稻氮代谢、抗逆性、形态特征和产量构成等影响各异, 与清水对照比, 30%莎稗磷EC显著增加水稻前期MDA含量, 并显著降低水稻前期的NR活性、收获期有效分蘖数、穗长和小穗数; 60%丁草胺EC和50%丙草胺EC高剂量处理效果相近, 均对水稻体内的NR活性、MD...
采用倒置“W”9点取样法和七级目测法,调查了攀西烟田杂草发生的种类和危害状况;同时采用田间定点调查法研究了烟田杂草的出苗规律。结果表明,攀西烟田杂草共有30科75属115种,根据相对多度和综合危害指数,最主要的杂草有尼泊尔蓼、马唐、酸模叶蓼、辣子草、光头稗、藜等;烟田杂草有2个出苗高峰,一个在烟草移栽后20～30d,另一个在烟草揭膜培土后1～10d,其中以第1个出苗高峰为主。
The use of herbicides for weed control in direct wet-seeded rice (Oryza sativa L.) in rice production regions in the Republic of Macedonia
rice herbicides weed control yield
2015/3/3
Field trials were conducted in the Agricultural Research Institute for Rice, at two localities during 2005 and 2006. The objective of the study was to establish an appropriate weed management strategy...
Changes in weed species spectrum of perennial weeds on arable land, meadows and pastures
expansion perennial weeds
2015/3/3
Occurrence of selected perennial weeds has been monitored at control sites across the Czech Republic since 1989, and trends of their occurrence have been evaluated. The monitoring has been aimed mainl...
Effect of soil applied herbicides and depth of sowing on common cocklebur (Xanthium strumarium L.) and maize (Zea mays L.) emergence and early growth
Xanthium strumarium L. Zea mays L. herbicides
2015/3/1
Greenhouse trials were conducted during 2005 to investigate the effect of six soil applied herbicides on common cocklebur (Xanthium strumarium L.) sowed at a depth of 4 cm and 7 cm, and determine the ...
The effect of cryopreservation on germination of dandelion seeds
dandelion Taraxacum officinale weed seed freezing drying germination storage
2015/3/1
Germination experiments frequently use seeds that had been stored frozen. We investigated whether short, 5 day freezing changes percentage and rate of germination of seeds of dandelion (Taraxacum offi...
葫芦科杂草小马泡危害玉米
小马泡 危害 玉米
2017/11/14
小马泡(Cucumis bisexualis)属于葫芦科黄瓜属的一年生匍匐草本植物, 属于我国特有植物, 主要分布于江苏、山东和安徽等地, 喜生于山坡、田边和路旁。2014年作者在河北省沧州市南皮县玉米田间调查时发现了小马泡的危害。目前, 小马泡对玉米的生长构成严重影响, 常规的防除技术很难防治, 因此, 亟须制定小马泡的综合防治技术体系。
Occurrence of biotic harmful agents in Czech grass seed production (1995–2004)
grass seed weeds diseases pests external conditions
2015/2/6
In the years 1995–2004 the spectra of weeds, diseases and pests in grasses grown for seed in the Czech Republic were examined and the effect of external factors on their changes was assessed. The spec...
Harmful occurrence of Rosy rustic moth (Hydraecia micacea) (Noctuidae: Lepidoptera) on hop in the Czech Republic
hatching of caterpillars weeds parasitoids harmfulness monitoring antagonist
2015/2/2
The Rosy rustic moth (Hydraecia micacea) has been a pest of hop in Czech hop regions for a long time. It causes most severe damages in hop gardens infested by quackgrass (Elytrigia repens) on waterlog...
Origin, mechanism and molecular basis of weed resistance to herbicides
resistance to herbicides origin and spread of resistant weeds target site metabolic resistance molecular basis of resistance
2015/1/30
This review summarises information from the literature and experimental experience of the authors in research on weed resistance to herbicides. Factors conditioning the origin of resistance are descri...
First report of Ageratum conyzoides L. and Sida acuta Burm F. as new weed hosts of Tomato yellow leaf curl Tanzania virus
Tomato yellow leaf curl Tanzania virus weed hosts amplification hybridisation
2015/1/30
Tomato farms in the Dodoma region of Tanzania where a high incidence of Tomato yellow leaf curl Tanzania virus has been reported were visited to survey for weed hosts. Weeds exhibiting symptoms of inf...
Predicting Biofuel Invasiveness:A Relative Comparison to Crops and Weeds
Bioenergy invasive species weed risk assessment
2015/12/26
Concern raised against using highly competitive, exotic, large-statured, perennial grasses with fast growth rates as bioenergy crops has led to calls for risk assessment before widespread cultivation....