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1.
3种除草剂对甘薯田杂草的田间防效试验   总被引:4,自引:0,他引:4  
为明确乙草胺、乙氧氟草醚、二甲戊乐灵3种除草剂对甘薯的安全性和对甘薯田杂草的防治效果,进行了田间小区试验。结果表明:各处理对甘薯安全,综合30、45d调查结果,喷洒50%乙草胺乳油4500mL/hm^2对禾本科杂草株防效较好;喷洒24%乙氧氟草醚乳油1500mL/hm^2对阔叶杂草防效较好;喷洒50%乙草胺乳油4500mL/hm^2、24%乙氧氟草醚乳油750mL/hm^2和24%乙氧氟草醚乳油1500mL/hm^23个处理对杂草的综合防效较好。30d综合株防效分别为73.05%、65.55%、83.81%;45d综合株防效分别为86.26%、84.54%、88.81%,鲜重防效分别为92.90%、97.11%、97.80%,可有效防除甘薯田杂草。  相似文献   

2.
结果表明:50%二溴磷EC对稻飞虱有较好的防治效果,但持效性一般;80ml/667m^2、60ml/667m^2和40ml/667m^23个剂量的校正防效:药后3d分别是94.87%、90.46%和84.74%;药后7d分别是92.90%、86.47%和81.29%。明显高于80%敌敌畏EC60ml/667m^2,与对照药50%-溴磷EC对比,使用同等剂量时防效相近;药后14d时对稻飞虱的增长虽有一定的抑制作用,但已无实际防效。建议在生产上与其他药剂轮换使扇,使用剂量为40-80ml/667m^2。  相似文献   

3.
禾耐斯与农达混用防除免耕玉米田杂草的效果   总被引:1,自引:0,他引:1  
用90%禾耐斯乳油50~75ml/亩+41%农达水剂100~150ml/亩可有效地防除免耕玉米田内的马唐、狗尾草、旱稗、牛筋草、藜、铁苋菜和反枝苋等多种杂草,兼备了禾耐斯与农达的除草特点,对大草具有茎叶处理效果,同时还具有封闭除草作用,二者混用也具有一定程度的增效作用。  相似文献   

4.
乙草胺防除春大豆地杂草技术   总被引:1,自引:0,他引:1  
乙草胺为选择性芽前除草剂。乙草胺对春大豆地杂草防除最佳剂量为50ml/亩,播种当天施药,其除草效果在88,9%以上,鲜重防效达80,6%,实际产量为113.48kg/亩,增产率达86.55%。  相似文献   

5.
在无水浇条件下,进行沟麦套种甘薯旱作高产栽培技术试验,实现了每公顷产粮15t的目标。3年度小春、甘薯(折干)两季平均单产达15600kg/hm^2 ̄19459.95kg/hm^2,比平播小麦-夏甘薯一年两季增产2181.0kg/hm^2 ̄6040.5kg/hm^2,增长16.3% ̄45%;沟麦套甘薯高产栽培技术要点:施足肥料;选用抗旱抗病高产的小麦甘薯良种;小麦适期播种,甘薯适当早套,并盖地膜;小  相似文献   

6.
秋熟大豆生长期化学除草技术要点   总被引:1,自引:0,他引:1  
王世伯 《植物保护》1993,19(6):49-49
乙草胺Acetochlor为酰胺类高效除草剂,可广泛用于多种旱地作物除草。1991年我们对其在甘薯田中的除草效果及保产作用进行了试验,小区面积13.8m~2,3次重复。 设亩用乙草胺75ml、100ml、拉索75ml、100ml等4个处理,另设一个不施药不进行人工除草为对照。 试验结果亩用50%乙草胺(昆山农药厂)  相似文献   

7.
经田间试验,大胎破口时施第1次药,5d后施第2次药,25%广治乳油75ml/667m^2对三化螟的防治效果最高,达96.82%:比5%锐劲特悬浮剂30ml/667m^2的90.88%高5.94%;30%农赞乳油100ml/667m^2防治效果虽不及25%广治乳油和5%锐劲特悬浮剂,但极显著高于18%杀虫双水剂300ml/667m^2。  相似文献   

8.
在室内测定了赛丹对黑翅土白蚁的毒杀效果,结果表明:赛丹对黑翅土白蚁的毒杀效果较好,0.04~0.10μg/ml 3d后死亡率达到100%,0.01~0.02μg/ml 3d后死亡率也达到83%~90%。  相似文献   

9.
甘薯地应用酰胺类除草剂的除草效果   总被引:1,自引:0,他引:1  
甘薯地应用酰胺类除草剂的除草效果陈传权,俞秀英,杨国花(浙江省杭州市农科所310008)(浙江省富阳县农业局)一、材料与方法(一)供试药剂及剂量:50%乙草胺EC50、75、100ml/亩(江苏省南通第二农药厂产)、60%丁草胺EC75ml/亩(浙江...  相似文献   

10.
用5%锐劲特,20%三唑磷,40%辛硫磷防治稻水象甲,以5%锐劲特45ml/666.7m^2防效最好,药后5d、10d,5%锐劲特45ml/666.7m^2对成虫的防效分别达100%和90.0%,药后25d控制幼虫的效果仍有75.0%,而40%辛硫磷的药后防效分别为91.43%、73.33%和63.16%。建议这两种农药可以作为防治稻水象甲交替使用的农药。  相似文献   

11.
The nature of a reductive system which actively degrades mexacarbate in the rat intestine and liver was investigated. The system is characterized by its stability against heat and protease treatments and its requirements for a flavin cofactor and an acidic pH for a maximum activity. As a result of purification and spectroscopic identification attempts the system responsible for the above reductive activity was identified to be flavoprotein. Under anerobic conditions such flavoproteinflavin cofactor systems degrade mexacarbate first to 4-N-desmethylmexacarbate and then to polar water-soluble metabolites.  相似文献   

12.
利用祁连山老虎沟地区海拔4200m气象观测站2010年的观测资料,采用FAO Penman-Monteith公式,再利用作物系数法,对高寒草甸生长季(5月22-9月22)的蒸散发量进行估算和分析。结果发现:研究期共有124天,蒸散发总量为238.3mm,日均为1.87mm·d-1。生长初期、生长中期、生长末期的蒸散发总量依次为22.6mm,179.1mm,36.6mm,依次占研究期总量的8.4%,75.2%,15.3%。5月下旬至6月中旬,日均蒸散发量以较低水平缓慢上升;6月下旬迅速增加;6月末至7月中旬猛然回落;7月中旬至8月末,日均蒸散发量迅速上升且维持在较高水平;此后直到9月22日,缓慢减少。5-9月月蒸散发总量依次为6.6mm,46.4mm,74.5mm,77.6mm,33.1mm。  相似文献   

13.
Aetiology of Rhizoctonia in sheath blight of maize in Sichuan   总被引:1,自引:0,他引:1  
Rhizoctonia isolates obtained from maize grown in commercial fields in 33 representative counties (or cities) in Sichuan province in China were characterized according to colony morphology, hyphal anastomosis and pathogenicity. Of 141 isolates, 116 were identified as R. solani , 23 as R. zeae and two as binucleate Rhizoctonia . The isolates of R. solani were assigned to four anastomosis groups (AG): AG-1-IA (101 isolates, accounting for 71.6% of the total), AG-1-IB (2, 1.4%), AG-4 (9, 6.4%) and AG-5 (4, 2.8%). The two isolates of binucleate Rhizoctonia belonged to AG-K. On maize, isolates of AG-1-IA caused typical sheath blight symptoms. Lesions produced by isolates of AG-4, AG-5, AG-1-IB and AG-K were darker than those of AG-1-IA. Rhizoctonia zeae usually caused discontinuous lesions with a dark brown margin and a brown centre on the leaf sheaths, as well as ear rot. Isolates of AG-1-IA were the most virulent to maize, with an average lesion length of approximately 15 cm. Isolates of R. zeae produced lesions approximately 12 cm long, while those of AG-4, AG-5, AG-1-IB and AG-K were progressively shorter. On potato dextrose agar (PDA; pH 6.4), the minimum temperature for mycelial growth of R. zeae isolates was 14–18°C, the maximum 38–40°C and optimum 30°C. Isolates of R. zeae did not grow on PDA (28°C) at pH 2.0, the optimum for growth being pH 6.4.  相似文献   

14.
西北地区冬季室内三种常绿植物的光合特性比较   总被引:1,自引:0,他引:1  
使用Li-6400XT便携式气体交换系统的红蓝光源和液化CO_2钢瓶注入系统,模拟冬季室内较密闭环境下存在较高CO_2浓度且为弱光环境,设置CO_2浓度为600μmol·mol~(-1),并以400μmol·mol~(-1)作为对照组(CK),对绿萝(Scindapsus aureus)、鹅掌柴(Scheffera octophlla(Lour).Harins)和燕子掌(Crassula agenten Thunb.)进行光响应(Pn-PAR)曲线的测定。结果显示:在CO_2浓度600μmol·mol~(-1)下,三种植物的光饱和点(LSP)均比(CK)更早出现,绿萝和鹅掌柴总体的净光合速率(Pn)比(CK)高,燕子掌比(CK)低;绿萝的最大光合速率(Pmax)、光饱和点(LSP)和表观量子效率(YAQ)均最高,分别为5.62±0.145μmol·m~(-2)·s~(-1)、373.51±24.15μmol·m~(-2)·s~(-1)和0.041±0.003μmol·μmol~(-1),但暗呼吸速率(Rd)较低(-0.51±0.14μmol·m~(-2)·s~(-1));鹅掌柴和绿萝的水分利用率(WUE)和蒸腾速率(Tr),极显著高于燕子掌(P<0.01);绿萝的叶绿素SPAD值最高(70.03±4.18),极显著高于其余两种(P<0.01)。研究表明,绿萝对光照具有最强的利用能力,且能在高CO_2浓度且干旱的环境里健康生长,并能对室内环境起到较强的增湿效应,是西北地区冬季较为理想的室内植物。  相似文献   

15.
本文通过对2012年山西省蔬菜农药残留监测结果的分析,找出造成山西蔬菜农药残留问题原因,并针对性的提出了解决问题的对策,为蔬菜生产提供依据。  相似文献   

16.
环流特征量指数在新疆汛期降水趋势预测中的应用   总被引:6,自引:5,他引:1  
利用中国气象局气候中心下发的74类环流特征量值,通过相关分析,建立了新疆10个区域的汛期降水预测模型。结果表明:预测模型对新疆汛期降水趋势有一定的预报能力,尤其是在新疆洪涝灾害多发的伊犁及博尔塔拉蒙古自治州、北疆沿天山一带、天山山区,建立的3个区域预测模型可以作为汛期降水预测的主要工具。  相似文献   

17.
In 1986, mass-mycelial isolates of Botrytis cinerea from 67 tomato crops in England and Wales were examined for benomyl and iprodione resistance. Of the 706 isolates obtained, 62.7% were resistant to benomyl at 2μg/ml and 43.2% were resistant to iprodione at 2 μg/ml. Iprodione resistance persisted in the absence of a dicarboximide spray programme. The incidence of benomyl resistance has not decreased since the last survey in 1984 in spite of a considerable reduction in the use of benzimidazole fungicides. There were no clear indications that the use of dichlofluanid influenced the incidence of benomyl or iprodione resistance. Disease control was poorer in crops with a higher incidence of iprodione resistance.  相似文献   

18.
During a survey of virus diseases affecting pepper grown in plastic houses in Crete, during 1984–1986, tomato mosaic virus (ToMV) and tobacco mosaic virus (TMV) were detected. The most common virus was TMV, being present in samples of alle pepper cultivars carrying the L1 resistance gene, while ToMV was isolated only from susceptible pepper cultivars. According to responses ofCapsicum spp. the isolates from 640 samples checked were classified into three pathotypes: P0, P1.2 and P1.2.3. Results of this study show that P1.2 represents at present the major threat to the Cretan pepper industry.Samenvatting Bij een in de jaren 1984–1986 gehouden inventarisatie van virusziekten in paprika in plastic-foliekassen op Kreta werd zowel het tabaksmozaïekvirus (TMV) als het tomatemozaïekvirus (ToMV) aangetoond. TMV kwam zeer algemeen voor: het werd aangetroffen in alle monsters van de paprikarassen met het resistentiegen L1. ToMV werd alleen geïsoleerd uit planten van vatbare paprikarassen. Volgens de waargenomen symptomen die de isolaten van 640 monsters opCapsicum spp. vertoonden, konden de isolaten in drie pathotypen, nl. P1, P1,2 en P1,2,3, worden geklassificeerd. Uit het onderzoek is gebleken dat P1,2 de belangrijkste bedreiging vormt voor de teelt van paprika op Kreta.  相似文献   

19.
Tomatoes grown in plastic houses in Crete have been inspected since 1980 for virus diseases. Plants with virus-like symptoms were checked by sap inoculation to test plants and the isolated viruses were identified by host reaction and serology. The most common viruses were, in order of frequency, tomato mosaic virus (ToMV), potato virus X, tomato bushy stunt virus (TBSV), potato virus Y and cucumber mosaic virus. The large use of ToMV-resistant cultivars reduces gradually the importance of ToMV while TBSV tends to become a serious problem of tomato in Crete.Samenvatting Van 1980–1984 werden op Kreta de in plasticfolie-kassen geteelde tomaten geïnventariseerd op de aanwezigheid van virussen. Verdachte plante werden door sapinoculatie op toetsplanten onderzocht. De daarbij geïsoleerde virussen werden daarna via de symptomen op de waardplanten en serologisch geïdentificeerd. In volgorde van belangrijkheid werden de volgende virussen het meest aangetroffen: tomatemozaïekvirus, aardappelvirus X, tomatedwerggroeivirus, aardappel Y virus en komkommermozaïekvirus, De laatste jaren is door de toenemende teelt van tomaterassen met resistentie tegen tomatemozaïekvirus het belang van dit virus sterk verminderd, terwijl het tomatedwerggroeivirus een steeds ernstiger probleem lijkt te worden.  相似文献   

20.
2013年我国黏虫发生特点分析   总被引:4,自引:0,他引:4  
刘杰  姜玉英  曾娟 《植物保护》2015,41(3):131-137
2013年黏虫维持了2012年以来的重发态势。二代黏虫在东北、华北、黄淮局部、江南局部、西南地区普遍发生,多种作物受害严重,总体发生程度重于2012年同期,山西、河北等局部地区大发生。三代黏虫在东北、华北和黄淮局部等地偏重发生,虽然发生面积、发生程度整体上不如2012年严重,但是仍显著重于常年,并且在辽宁、山西、山东的局部地区造成严重危害。分析提出,监测防控及时到位、关键时期气象条件不利,是2013年三代黏虫发生程度轻于2012年的主要原因。  相似文献   

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