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• W1452032194 abstract "The Manyame River System consists of the Manyame River and its tributaries, the Mukuvisi and Nyatsime rivers, which discharge water into man-made Chivero and Manyame lakes situated at 29 km and 33 km, respectively, from Harare. Water hyacinth is the predominant floating aquatic weed in the system. About 15 years ago, the water was covered with various aquatic weeds namely: water hyacinth (35%), Pistia stratiotes (36.6%) and Myriophyllum aquaticum (1.7%). Ten years later, the estimated weed coverage was water hyacinth (3%), P. stratiotes (0.3%), M. aquaticum (4%). Also, Azolla filiculoides had appeared in Lake Chivero, forming a 1% coverage. In 2000, the weed coverage on the system was 2.4, 0.8, 6,8 and 3.5%, respectively, and 9.5% of the water surface of Lake Chivero had been invaded by Hydrocotyle ranunculoides. The control of water hyacinth was accomplished through chemical, biological and mechanical means, while the management of P. stratiotes was accomplished mainly through classical biological control. The appearance of M. aquaticum and H. ranunculoides may have been facilitated by the absence of natural enemies, and reduced competition for space and nutrients by the previously dominant water hyacinth and P. stratiotes. In 2000, the Zimbabwe Aquatic Weed Management Committee was formed to manage the aquatic weed problem in a holistic manner. ZIMBABWE has been involved in the biological control of pests, including floating aquatic weeds, since the 1950s (Chikwenhere 1994, 2001). The country has been working through international collaboration and cooperation as a means to achieving sustainable classical biological control technologies. Following the First IOBC Global Working Group Meeting for the Biological and Integrated Control of Water Hyacinth, held in Harare, Zimbabwe, in 1998, Zimbabwe adopted a new coordinated approach in the management of the water hyacinth problems, with particular attention to the Manyame River System thus including Chivero and Manyame lakes. Formation of Zimbabwe Aquatic Weed Management Committee The Zimbabwe Aquatic Weed Management Committee was formed in July 2000 and it comprises various stakeholders including government, university and private sector representatives (Table 1). The committee’s mandate is to identify water impoundments for immediate chemical and biological control strategies for aquatic weeds, including chemical control of newly emerging water hyacinth seedlings, and to train national parks personnel in the proper use of spray equipment. The committee is also charged with preparing an implementation plan for waterweed management in the short and medium terms. This would: * Plant Protection Research Institute, P.O. Box CY 550, Causeway, Harare, Zimbabwe. Email: plantpro@internet.co.zw" @default.
• W1452032194 created "2016-06-24" @default.
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• W1452032194 date "2001-01-01" @default.
• W1452032194 modified "2023-09-26" @default.
• W1452032194 title "Current strategies for the management of water hyacinth on the Manyame River System in Zimbabwe." @default.
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