نتایج جستجو برای: pests

تعداد نتایج: 11207  

2003
Ernst A. Wimmer

Many insects compete with us humans for agricultural resources, feed on us, or act as disease vectors. Current control efforts rely mostly on the use of insecticides. The use of chemicals to either repel or kill insect pests is the oldest and most commonly used method of pest control. However, with the massive use of insecticides four major problems have arisen. First, many pests have developed...

2009
Zhongyi Xiang

In this paper, we consider a SI system with spraying microbial pesticide and releasing the infected pests, the infected pests have the function similar to the microbial pesticide and can infect the healthy pests, further weaken or disable their prey function till death. By applying the Floquet theorem of linear periodic impulsive equations and the comparison theorem, we show that there exists a...

2008
Juhua Luo Wenjiang Huang Jihua Wang Chaoling Wei

The aim of this study was to establish the warning and prediction system for crop diseases and pests based on SuperMap IS. NET geographic information system (GIS), which was developed by Supermap company. In this system, the author used GIS and remote sensing (RS) technology. The system could transform data information into a geographical information map to show the occurrence degree and distri...

2012
M. Srinivasa Rao C.A. Rama Rao K. Srinivas G. Pratibha S.M. Vidya Sekhar G. Sree Vani B. Venkateswarlu

Intercropping is one of the important cultural practices in pest management and is based on the principle of reducing insect pests by increasing the diversity of an ecosystem. On-farm experiments were conducted in villages of semi-arid tropical (SAT) India to identify the appropriate combination of castor (Ricinus communis L.) (Malpighiales: Euphorbiaceae) and intercropping in relation to pest ...

2004
N D Barlow

Simple grazing models with two herbivores are used to assess the effects of pasture pests on stability and productivity of continously-growing pastures. Algebraic and graphical methods are also presented for estimating losses from pasture pests at different stocking rates directly, from data on productivity/stocking rate relationships. Pests are considered as competing grazing herbivores and de...

2017
Atif Kamran Muhammad Asif Syed Bilal Hussain Mukhtar Ahmad Arvind Hirani

Wheat is one of the major cereal crops with annual global production over 600 MT from about 200 M hectares (FAO 2012). The cultivation of wheat started about 10,000 years ago as part of the Neolithic revolution which state a transition from hunting and gathering of food to settle agriculture. Earlier cultivated forms of wheat were diploid (einkorn) and tetraploid (emmer) with known initial orig...

2004

Name: Citrus blight disease Taxonomic position: Unknown Common names: Young tree decline, sandhill decline, roadside decline, rough lemon decline (English) Declinamiento, marchitamiento repentino (Spanish) Declinio (Portuguese) Notes on taxonomy and nomenclature: Typical citrus blight is the disease known in Florida (USA). More or less similar diseases have been described from other parts of th...

2004
Maarten Jongsma

Current GM crops are thus far the almost exclusive domain of herbicide and insect resistance traits. The Bt toxins used for insect control have a narrow specificity against lepidopteran and coleopteran pests only. Yet, aphids and thrips are highly important pests worldwide, causing severe direct losses and transmitting devastating viruses such as Tomato Spotted Wilt Virus (TSWV). So far, few us...

2004
Preetha Rajan

Pest detection and identification of diseases in agricultural crops is essential to ensure good productivity. The productivity of plants will reduce due to diseases and presence of pests. Image processing can be used to identify the pests and thereby can reduce the use of pesticides. Image processing involves capturing the image and applying various preprocessing techniques and detect the pest ...

Journal: :journal of agricultural science and technology 2010
a. k. dhawan s. singh s. kumar

the adoption of integrated pest management (ipm) strategy by farmers of bathinda cotton belt of punjab, india resulted in reduction of insecticidal applications. there was 3-4 times reduction in insecticidal applications in ipm villages (4.86-5.33) over the non-ipm villages (15.16-18.12). a general trend of reduced insecticidal applications of both conventional as well as new insecticides, in i...

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