The potential of a herbicide resistant maize technology for Striga control in Africa
The potential of a herbicide resistant maize technology for Striga control in Africa
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DOI：
10.1016/j.agsy.2007.12.003
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发表时间：
2008-04-01
影响因子：
6.6
通讯作者：
Friesen, Dennis
中科院分区：
文献类型：
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作者：
De Groote, Hugo;Wangare, Lucy;Friesen, Dennis
Striga是一种专性寄生杂草，侵袭撒哈拉以南非洲的谷类作物。在肯尼亚西部，它已被农民确定为玉米的主要害虫问题。用咪唑啉酮类除草剂咪唑烟包衣抗咪唑啉酮玉米品种种子，对防治田间稻瘟病效果显著。为了将这项技术带给农民，需要开发一种可持续的交付系统，最好是有私营部门的大量参与。为了帮助推广代理商和种子公司制定适当的战略，通过将不同的数据源整合到一个地理信息系统(GIS)中，分析了这项技术的潜力。通过叠加次级数据、实地调查、农业统计和农民调查，可以清楚地确定肯尼亚西部易发稻瘟病的地区。结果发现，稻瘟病每年影响玉米面积24.6万公顷，人口640万，玉米产量58万吨，人均81公斤。这一地区的人口密度很高，达359人/公里(2)。一项对123名农民的调查显示，70%的农民在自己的田里种了稻草。条件估值(CV)调查表明，农民平均愿意按当前种子价格每人购买3.67公斤IR玉米种子，足以播种44%的玉米面积。通过对该地区玉米区域的外推，红外玉米种子的潜在总需求估计为每年2000-2700吨。类似的计算，但基于不那么精确的数据和专家意见，而不是农民调查或试验，给出了非洲对红外玉米种子的潜在需求估计为153,000吨。(C)2008爱思唯尔有限公司。保留所有权利。
Striga is an obligate parasitic weed that attacks cereal crops in sub-Saharan Africa. In Western Kenya, it has been identified by farmers as their major pest problem in maize. A new technology, consisting of coating seed of imidazolinone resistant (IR) maize varieties with the imidazolinone herbicide, imazapyr, has proven to be very effective in controlling Striga on farmer fields. To bring this technology to the farmer, a sustainable delivery system needs to be developed, preferably with substantial participation of the private sector. To help extension agents and seed companies to develop appropriate strategies, the potential for this technology was analyzed by combining different data sources into a Geographic Information System (GIS). Superimposing secondary data, field surveys, agricultural statistics and farmer surveys made it possible to clearly identify the Striga-prone areas in western Kenya. Results found that Striga affected a maize area of 246,000 ha annually, with a population of 6.4 million people and maize production of 580,000 tons, or 81 kg/person. Population density in this area is high at 359 people/km(2). A survey of 123 farmers revealed that 70% of them have Striga in their fields. A contingent valuation (CV) survey indicated that farmers would, on average, be willing to buy 3.67 kg of the IR-maize seed each at current seed prices, sufficient to sow 44% of their maize area. By extrapolation over the maize area in the zone, total potential demand for IR-maize seed is estimated at 2000-2700 tons annually. Similar calculations, but based on much less precise data and expert opinion rather than farmer surveys or trials, gives an estimate of the potential demand for IR-maize seed in Africa of 153,000 tons. (C) 2008 Elsevier Ltd. All rights reserved.