共查询到20条相似文献,搜索用时 62 毫秒
1.
2003年全国农区统一灭鼠示范成效显著 总被引:1,自引:0,他引:1
为贯彻落实<国务院办公厅关于深入开展毒鼠强专项整治工作的通知>精神,按照农业部"2003年毒鼠强专项整治工作实施方案"的要求,全国农技中心加大了对全国农区统一灭鼠的组织、指导力度,加强了技术培训和示范推广工作,各级农业植保部门积极组织农区统一灭鼠.开展大规模农区统一灭鼠活动,对引导农民正确选择安全杀鼠剂,规范灭鼠技术,对减轻农区鼠害,遏制毒鼠强的危害,发挥了重要作用,取得了显著的经济、社会和生态效益. 相似文献
2.
3.
《国务院办公厅关于深入开展毒鼠强专项整治工作的通知》(国办发[2003]63号)要求“从2004年开始,按照城乡结合,统一时间,统一培训,统一供药,统一检查的原则,在每年春秋两季开展全国统一灭鼠行动”。为落实中央一号文件和国办发[2003]63号文件精神,今年农业部办公厅以一号文件形式下发《关于开展春季农区统一灭鼠工作的通知》,在全国范围组织开展春季农区统一灭鼠工作。 相似文献
4.
5.
按照《国务院办公厅关于深入开展毒鼠强专项整治工作的通知》精神,2003年我们大连市积极开展了毒鼠强专项整治工作。一是取消了全市所有乡(镇)集贸市场的非法杀鼠剂经营摊位,共计384个,打掉了毒鼠强等违禁杀鼠剂的一个重要经营场所;二是确定杀鼠剂定点经营单位95个,使杀鼠剂有了一 相似文献
6.
7.
8.
9.
10.
11.
J. Stuart Holden 《Pest management science》1979,10(4):295-307
Permethrin was metabolised by attack at the ester bond, in vivo by adult cockroaches, Periplaneta americana and in vitro by esterase preparations. Metabolites retaining the ester linkage could not be detected. In all cases, the (1RS)-trans-isomer (transpermethrin) was more labile than the (1RS)-cis-isomer. Cypermethrin was metabolised at one-fifth the rate for permethrin. In-vitro and in-vivo studies with synergists indicated that cleavage of the ester bond in permethrin can be both oxidative for the (1RS)-cis-isomer and hydrolytic for the (1RS)-trans-isomer. The penetration of permethrin through the cuticle of the cockroach was significantly greater than that of cypermethrin. The penetration and metabolism of permethrin and cypermethrin in sixth-instar larvae of susceptible and resistant strains of the Egyptian cotton-leafworm, Spodoptera littoralis, were studied as possible factors in resistance. No significant differences were found. It is suggested that the major resistance factor to permethrin in S. littoralis is probably non-metabolic. 相似文献
12.
历史时期关中平原水旱灾害与城市发展 总被引:1,自引:4,他引:1
通过对历史时期以来关中平原旱灾、水涝灾害发生频率的统计与分析,发现从370 BC-2000 AD的2 300多年里,关中平原有2个时期水旱灾害的发生最为频繁,即610-850 AD(隋后期至唐后期)和1580-2000 AD(明后期以来).而且,水旱灾害的发生相互联系,旱灾频繁的时期,也是水涝频繁发生的时期.深入分析发现,水旱灾害的发生一方面与关中平原气候变化、中心城市的建设发展与衰落有密切联系;另一方面也与人口数量的增长密切相关.其根本原因在于城市建设和人口增加,对自然资源的开发利用和消耗大幅度增长,对城市周边山地和丘陵地区环境的压力剧增,造成环境的迅速退化,导致平原地区水旱灾害频繁发生. 相似文献
13.
Dr. R. G. Kapooria Dr. J. C. Zadoks 《European journal of plant pathology / European Foundation for Plant Pathology》1973,79(6):236-242
Teleutospores ofPuccinia horiana P. Henn. germinate soon after their formation. Promycelia germinating on microscope slides have a tendency to grow in length and become narrow in outline; when germinating in situ, developing promycelia are short and stout, and show a lobed apical cell. The promycelium is usually three-celled, but at times it is one- or two-celled.Two basidiospores are usually produced by each promycelium (observed range one to three). Basidiospores are uni- or binucleate at first, but later become multinucleate. They germinate rapidly on microscope slides and on host leaves, when sufficiently wet. Three different patterns of basidiospore germination were observed.Samenvatting Teleutosporen vanPuccinia horiana P. Henn. kiemen spoedig na hun vorming. Promycelia gekiemd op objectglaasjes zijn langer en smaller dan promycelia gekiemd in situ. Het promycelium is meestal driecellig, soms ook een- of tweecellig. Een promycelium produceert één tot drie, meestal twee basidiosporen. Deze zijn aanvankelijk een- of tweekernig, later meerkernig. Basidiosporen kiemen snel op natte objectglaasjes en bladeren. De basidiosporenkieming kan op drie onderling iets verschillende wijzen verlopen. 相似文献
14.
在干旱地区,节水与防止水资源污染同等重要,我们于2001年6月~2003年12月对孔雀河水质进行监测,每月15日取样观测一次。经过分析数据得出:河水符合生活用水标准和农田灌溉水标准占52.8%。通过对河水水质的年变化规律分析得出:引起孔雀河水盐分含量增高的主要因素为上游的排水、排盐,其次为河水源头“博斯腾湖”水盐分含量比较高。与其它内陆干旱河流相比,排水、排盐是引起河水盐分增加的共同点,而河水浓缩致使盐分含量增加在孔雀河中游表现不明显,河水源头盐分含量比较高为其特征,望在塔里木河治理中引起重视。 相似文献
15.
16.
Jorge Carrión‐Tacuri Regina Berjano Giovanny Guerrero Enrique Figueroa Alan Tye Jesus M. Castillo 《Weed Biology and Management》2014,14(3):209-219
Fruit set is highly relevant to a plant's reproductive success. Fruit set can vary due to predation on flowers, pollinator services and/or resource availability. Reproductive success, measured as the fruit set of the invasive Lantana camara and the endemic Lantana peduncularis in the cool–dry season and the warm–wet season of the Galapagos Islands, was studied. Also, autonomous self‐pollination ability and seed viability were probed for both species. Furthermore, flower visitors and their activity were registered for both species during the warm–wet season. Lantana peduncularis produced fewer flowers per inflorescence, but had a higher fruit set in the cool–dry season, compared to the warm–wet season. In contrast, the fruit set in L. camara did not change seasonally. The fruit set in L. camara was higher than in L. peduncularis in the warm–wet season. Moreover, ~18% of the bagged flowers of the invasive Lantana produced fruits by autonomous self‐pollination, while for the endemic Lantana, the rate of autonomous self‐pollination was very low. More than 80% of the fruits for both species had at least one viable seed per fruit. The number of pollinators and their frequency, inflorescence‐ and flower‐visiting rates and the duration of the visit per flower were higher in the invasive Lantana than in the endemic one. The endemic Lepidoptera Urbanus galapagensis (the main pollinator of both Lantana species) and the introduced Hymenia perspectalis were observed pollinating both Lantana species. These results indicate that the alien L. camara is more attractive to pollinators and it has reproductive advantages regarding fruit set in comparison with L. peduncularis, factors that contribute to the colonization pattern of this invasive species. 相似文献
17.
18.
沙尘物质的来源与防治途径 总被引:4,自引:1,他引:4
本文分析了沙尘暴形成的自然过程和危害特征,并探讨了内蒙古沙源区土壤颗粒物质的含量,指出沙尘暴的沙尘来源主要是退化草原、活化的沙地和裸露坡耕地等。同时根据风沙流运移规律及其和土壤颗粒的关系,提出了防治沙尘暴的关键技术原理,并探讨了有效控制沙尘暴的技术途径。 相似文献
19.
20.
塔里木河中下游农户能流分析及生态经济分形特征 总被引:3,自引:1,他引:2
能流分析和分形理论是农业生态经济系统定性研究和定量分析的重要手段之一。把农户作为“分形元” ,以尉犁县兴平乡达西村 4 0个农户为研究对象 ,在绿洲农业生态系统能流分析基础上 ,对不同经营类型农户的生态经济特征进行分形研究 ,结果表明 :(1) 5类农户从总体上都显现生产经营结构单调 ,能量利用和转化链条短 ;牲畜养殖是唯一的次级生产系统 ,能量转化率低 ,增效不明显。 (2 )农田亚系统是农户生产力的主体 ,棉花生产现在和今后若干年内仍将是农户的支柱产业。 (3)基于农户分析的生态效益和经济效益之间没有相关关系 ;生态效益高 ,并不意味着经济效益也高 ,反之亦然。农户生产系统总体的生态经济协调发展水平不高。 相似文献