نتایج جستجو برای: pests and diseases problems

تعداد نتایج: 16930741  

Journal: :Forests 2022

The occurrence patterns of forest insect pests and diseases have been altered by global events such as climate change. Recent developments in improved monitoring methods tools for data analyses provide new opportunities to understand the causes consequences changes. Using a variety management tools, pest programs can mitigate influence changes on health. goal this Special Issue is improve our u...

Journal: :Bulletin of the Entomological Society of America 1979

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد 1388

plagiarism in esl/efl learning contexts has been established as a dynamic and multi-layered phenomenon and has become a topic engaging many researchers in a heated debate in recent years. comparisons of student-generated texts with their source texts have shown that students rely on source texts in their writings and copying is a major strategy used by both l1 and l2 writers. in our country a...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده حقوق و علوم سیاسی 1390

چکیده : نظام انتخاباتی قواعد و چار چوب های به رسمیت شناخته شده ای است که بیانگر چگونگی تبدیل آرای مردم به مناصب و پست های سیاسی است. این نظام انتخابات باید به گونه ای عمل کند که نتیجه آن فراهم شدن مکانیسم و ساز و کار مطلوب و مناسب برای برگزاری انتخابات سالم و رقابتی باشد. به نظر می رسد نظام انتخاباتی جمهوری اسلامی ایران دارای ضعف ها و نواقصی است که به سبب آن ها نمی توان انتخابات مطلوب را برگزا...

2007
Carroll B. Williams David L. Azuma George T. Ferrell

Approximately 3.200 trees in young mixed~conifer stands were examined for pest activity and human-caused or mechanical injuries, and approximately 25 percent of these trees were randomly selected for stem analyses. The examination of trees felled for stem analyses showed that 409 (47 percent) were free of pests and 466 (53 percent) had one or more pest categories. Incense~cedar contained the fe...

2012
Mei WANG Xin-ju LI Qian-qian YAO Yi LIU

To study the feasibility of monitoring the diseases and insect pests in tobacco using hyperspectral remote sensing, leaf spectrum of tobacco infected with diseases and insect pests at different severity levels was measured by using ASD hand-held spectroradiometers. The reflectance data was transformed by the method of the first differential coefficient. Meanwhile, the correlation between severi...

Abolfazl Javadian Abolfazl Mahmodi Gholamreza Yavari, Simin Dokht Ghasemian, Vahid Majed

Citrus production has a great importance and position in Iran. The growth and sustainability of the agriculture sector is impossible without appropriate and effective risk identification and management. In this study, the main risks of citrus gardens were identified based on the Delphi method through questionnaires completed by 16 experts. Then, using the TOPSIS technique, the risks involved in...

2008

Global trade, both in variety and quantities of goods moved, is increasing year by year. For example,WTO statistics indicate that between 2000 and 2005, global sea and air freight rose by around 20percent with volumes now exceeding 7 billion tons per year. Trends in eco-climatic variables underdifferent climate change scenarios also show marked differences in key drivers such as tem...

Journal: :کنترل بیولوژیک آفات و بیماری های گیاهی 0
فاطمه رزاقی دانشجوی دکتری دانشکدة اقتصاد و توسعة کشاورزی، دانشگاه تهران احمد رضوانفر استاد دانشکدة اقتصاد و توسعة کشاورزی، دانشگاه تهران حسین شعبانعلی فمی استاد دانشکدة اقتصاد و توسعة کشاورزی، دانشگاه تهران ابوطالب حسین پور استادیار دانشگاه علوم کشاورزی و منابع طبیعی مازندران

the aim of this study was to comparable application cultural, biological and chemical control methods of pests, diseases and weeds in rice among paddy farmers in sari county. a sample of 260 farmers was selected by using proportional random sampling method. data were collected by means of a questionnaire. validity of questionnaire was confirmed by agricultural jihad experts of sari county and s...

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