نتایج جستجو برای: Bt cotton

تعداد نتایج: 28655  

It is often argued that learning from best examples in the neighbouring Burkina Faso and elsewhere, Ghana can succeed in revamping the collapsing cotton industry by introducing Bt cotton to farmers. This paper therefore presents a survey findings on farmers’ views and perceptions towards the possible introduction of Bt cotton. A stratified random sampling techniques was applied in selecting 254...

2016
Khuda Bakhsh Naeem Ahmad M. Asif Kamran Sarfraz Hassan Qasir Abbas Rashed Saeed M. Sadiq Hashmi

BACKGROUND Farm workers and female cotton pickers are exposed to residual impacts of pesticide use in cotton production, in addition to dust, ultraviolet radiation, etc. Cotton picking causes various health hazards among cotton pickers with varied health cost. A soil bacterium known as Bacillus thuringiensis (Bt) is incorporated in cotton seed through genetic modification and it has resistance ...

2006
Y.-X. Li S. M. Greenberg T.-X. Liu

With an assumption that the larvae of cabbage looper, Trichoplusia ni (Hübner), a secondary pest of cotton, Gossypium hirsutum (L.), could move between cotton plants in the field, we conducted a series of laboratory experiments to determine the larval movement, food choice, consumption, survival, and development on Bt (Bollgard II expressing Cry1Ac and Cry2Ab) and non-Bt cotton. On non-Bt cotto...

2017
Mi Ni Wei Ma Xiaofang Wang Meijing Gao Yan Dai Xiaoli Wei Lei Zhang Yonggang Peng Shuyuan Chen Lingyun Ding Yue Tian Jie Li Haiping Wang Xiaolin Wang Guowang Xu Wangzhen Guo Yihua Yang Yidong Wu Shannon Heuberger Bruce E. Tabashnik Tianzhen Zhang Zhen Zhu

Transgenic crops producing insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) are extensively cultivated worldwide. To counter rapidly increasing pest resistance to crops that produce single Bt toxins, transgenic plant 'pyramids' producing two or more Bt toxins that kill the same pest have been widely adopted. However, cross-resistance and antagonism between Bt toxins limit th...

2012
Peng Wan Yunxin Huang Bruce E. Tabashnik Minsong Huang Kongming Wu

In some previously reported cases, transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt) have suppressed insect pests not only in fields planted with such crops, but also regionally on host plants that do not produce Bt toxins. Here we used 16 years of field data to determine if Bt cotton caused this "halo effect" against pink bollworm (Pectinophora gossypiella) in s...

2014
Francisco S. Ramalho Jéssica K. S. Pachú Aline C. S. Lira José B. Malaquias José C. Zanuncio Francisco S. Fernandes

The host acceptance of neonate Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) larvae to Bt cotton plants exerts a strong influence on the potential risk that this pest will develop resistance to Bt cotton. This will also determine the efficiency of management strategies to prevent its resistance such as the "refuge-in-the-bag" strategy. In this study, we assessed the acceptance of neonate...

2012
Thierry Brévault Samuel Nibouche Joseph Achaleke Yves Carrière

Non-cotton host plants without Bacillus thuringiensis (Bt) toxins can provide refuges that delay resistance to Bt cotton in polyphagous insect pests. It has proven difficult, however, to determine the effective contribution of such refuges and their role in delaying resistance evolution. Here, we used biogeochemical markers to quantify movement of Helicoverpa armigera moths from non-cotton host...

2011
Haonan Zhang Wei Yin Jing Zhao Lin Jin Yihua Yang Shuwen Wu Bruce E. Tabashnik Yidong Wu

Transgenic crops producing Bacillus thuringiensis (Bt) toxins kill some key insect pests, but evolution of resistance by pests can reduce their efficacy. The predominant strategy for delaying pest resistance to Bt crops requires refuges of non-Bt host plants to promote survival of susceptible pests. To delay pest resistance to transgenic cotton producing Bt toxin Cry1Ac, farmers in the United S...

2013
Yunxin Huang Peng Wan Huannan Zhang Minsong Huang Zhaohua Li Fred Gould

Regional suppression of pests by transgenic crops producing insecticidal proteins from Bacillus thuringiensis (Bt) has been reported in several cropping systems, but little is known about the functional relationship between the ultimate pest population density and the pervasiveness of Bt crops. Here we address this issue by analyzing 16 years of field data on pink bollworm (Pectinophora gossypi...

Journal: :journal of crop protection 2015
palanisamy saravanan suhumaran divya purusothaman venkatesan rajkumar tanwar ajanta birah

the significant reduction of bollworm infestation by the implementation of integrated pest management (ipm) in bt cotton as a component of ipm led to reduction in bollworm infestation and increase in yield. however, these alterations have brought in many new biotic problems hitherto unknown or of little economic importance. field survey of rainfed bt cotton fields in perambalur district of tami...

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