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Report - Alternatives to fenthion for quelea bird control
… US$79.4 million per annum at 2011 prices throughout semi-arid zones (Elliott 1989a,b). At present control is mostly by … quelea is restricted to Africa where it occurs in semi-arid areas, feeding principally on native grasses but when … of likely quelea movements into and out of cropped zone. Alternative crops may not flourish in zone, especially …