盖杀几种农药防治害螨害虫的药效试验

2001年北疆棉区棉叶螨暴发成灾 ,棉花遭受严重损失。玛纳斯县包家店芳群农场引进美国FMC公司生产的10 %盖杀乳油 ,是一种广谱杀螨杀虫剂 ,其药效略优于克螨特、哒螨灵 ,氯氰菊脂等 ,显著的优于常规农药三氯杀螨醇、氧乐果、抗蚜威等多种药剂。10 %盖杀2000-3000倍液浓度下对叶螨类、蚜虫类、棉铃虫、地老虎幼虫等害虫防效喷药2天后均在81.5 -95.0 %以上。喷药10天后 ,防治棉叶螨的药效为98.46 -100% ,防治棉铃虫药效为86 -100 % ,防治棉蚜药效为100 % ,药效期可长达15 -20天。     

新疆昌吉市棉花害虫种类及防治现状调查

对昌吉市棉花害虫种类进行了调查.结果表明:棉花害虫(螨)有17种,其中害螨4种,为害严重的害虫(螨)有棉铃虫、棉蚜、棉叶螨等.文章阐述了昌吉市棉花主要害虫的危害及防治现状,提出了今后对棉花害虫(螨)综合治理的意见和建议.     

陕西甜菜夜蛾暴发原因与防治对策研究

近年来 ,甜菜夜蛾在陕西一些地区暴发成灾 ,发生为害特点为种群数量大 ,发生期长 ,范围广 ,为害作物种类多 ,为害程度重 .甜菜夜蛾自身的生态可塑性强及食物条件优化是大面积暴发的根本原因 ;研究重视不够 ,防治技术难度大 ,天敌杀伤是大面积成灾的重要因素 .针对甜菜夜蛾的发生为害特点 ,提出了及时清除田间杂草及作物、蔬菜下部老叶 ,深翻土壤 ,利用黑光灯、频振式杀虫灯、性诱剂诱杀成虫 ,人工杀灭及选用高效低毒安全农药进行化学防治等甜菜夜蛾防治对策 .     

石河子地区粮食作物害螨种类的调查研究

本文就石河子粮食作物害螨种类及为害特点进行了调查研究,从采到的标本中已鉴定出4科6属11种害螨。对其形态特征进行了比较说明,对为害部位和被害状进行了观察,发现叶螨属的害螨种类主要在叶子背面取食为害,而岩螨及苔螨属在叶子正反面均可为害,并对被害状作了描述,使生产单位能正确识别害螨,进行及时有效的防治作依据。     

“珍发”牌生物杀虫剂防治棉蚜、棉叶螨药效试验初报

都江堰市大发实业有限公司的珍发牌生物杀虫剂 ,是一种广谱杀虫、杀螨剂 ,低毒、无残留。经小区试验 ,防治棉叶螨药效优于三氯杀螨醇 ,略次于克螨特。对棉蚜喷药2天后 ,药效可达96.06 % ,5天后 ,药效可达98.03 % ,防治叶螨药效可达97 .99 % ,持效期可达10天     

福建省叶螨调查初报,附一新种记述(螨目:叶螨总科)

叶螨为植食性螨类中种类最多、经济意义最大的一个类群,很多种娄为害粮、棉、果树,是农业和林业的重要害虫。作者于1983年7至8月在武夷山自然保护区及福州市郊区对叶螨的种类和为害情况进行了初步调查,连同过去福建农学院寄送鉴定的叶螨标本,目前在福建省共发现26种叶螨,隶属于3科,11属,其中包括一新种。已知种中除柑桔全爪螨 Panony-chus citri(McGregor)、柑桔裂爪螨 Schizotetranychus baltazarae Rimando、柑桔     

海南岛农林作物叶螨初记

本文记述了海南岛分属于叶螨科和细须螨科的9种叶螨的主要形态特征、分布范围及其寄主植物,其中有19种寄主植物是这9种叶螨所为害寄主的新记录。文末还列出了9种叶螨的分类检索表。     

辉丰克螨防治棉叶螨效果试验

用辉丰克螨2000、3000倍液对棉叶螨防治试验表明,辉丰克螨2000～3000倍液施药20天后对棉叶螨防治效果好,防效为89～98.31%。     

金纹细蛾发生规律与防治研究进展

金纹细蛾是苹果等果树上一种常见的潜叶性害虫 ,东亚特有种 .自 2 0世纪80年代以来 ,金纹细蛾的危害在我国逐渐加重 ,成为果园的主要害虫之一 ,1992—1993年在全国范围内大暴发 .本文就国内近年来在金纹细蛾的发生为害规律及防治研究进展方面作以综述 .     

阿勒泰地区果蔬害螨研究初报

报导了阿勒泰地区果树害螨6 种,包括叶螨属( Tetranychus)3 种,始叶螨属( Eotetranychus)2种,全爪螨属( Panonychus)1 种。其中苹果全爪螨( P.ulni) 是新疆新记录种,同时还记述了该地区的蔬菜害螨4 种,均为叶螨属,其中绣球叶螨( T.hydrangeae) 在新疆也是首次报道。又据阿勒泰地区的气候特点,提出了综合防治措施。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that