Scientists recommend measures to contain rapid woody weed spread in Baringo County, Kenya

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A team of international scientists, including CABI’s Dr Urs Schaffner, have recommended ways to manage the devastating spread of the woody weed Prosopis juliflora, where in Baringo County, Kenya, its coverage rapidly increased by 2,031 percent in just 28 years.

PhD student Purity Rima Mbaabu, affiliated to the University of Nairobi and co-supervised by Simon Choge, Kenya Forestry Research Institute, Dr Sandra Eckert, Centre for Development and Environment, University of Bern, Switzerland, Profs. Maina Gichaba and Prof. Daniel Olago, University of Nairobi, and Dr Schaffner, is lead author of new research which states that the rates of Prosopis invasion in Kenya are a ‘major threat to the environment and rural people’s livelihoods.’

The study calls for the ‘urgent implementation of coordinated and sustainable Prosopis management in Baringo County and other invaded areas in East Africa’.

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Invasive species are Australia’s number-one extinction threat

By Andy Sheppard and Linda Broadhurst. Originally published on The Conversation.

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Barking Owls are one of Australia’s 1,770 threatened or endangered species. Navin/FlickrCC BY-SA

This week many people across the world stopped and stared as extreme headlines announced that one eighth of the world’s species – more than a million – are threatened with extinction.

According to the UN report from the Intergovernmental Science-Policy Platform for Biodiversity and Ecosystem Services (IPBES) which brought this situation to public attention, this startling number is a consequence of five direct causes: changes in land and sea use; direct exploitation of organisms; climate change; pollution; and invasion of alien species.

It’s the last, invasive species, that threatens Australian animals and plants more than any other single factor.
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Collaborative writeshop produces pest management decision guides for invasive species in Pakistan

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Invasive alien species (IAS) have devastating impacts on native biota, causing the decline or even extinction of native species, negatively affecting ecosystems. Invasive plants, animals, insects and microorganisms enter and establish in environments outside of their natural habitat. They reproduce rapidly, out-compete native species for food, water and space, and are one of the main causes of global biodiversity loss. Species can be introduced deliberately, through for example, fish farming, pet trade, horticulture, bio-control or unintentionally, through such means as land and water transportation, travel, and scientific research.

CABI, under its Action on Invasives programme, is working to manage the already existing and potential invasive species in Pakistan. Pest Management Decision Guides (PMDGs), through the Plantwise Knowledge Bank are practical, step-by-step tools for plant doctors and extension agents to give advice following the principles of integrated pest management (IPM).

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In the frame: fighting the scourge of parthenium weed in Pakistan

The CABI Blog

Parthenium in Pakistan CABI scientists get to grips with the ‘superior weed’ Parthenium which in India costs around USD 6.7 billion per annum to clear from pastoral land.

CABI has recently shared its expertise in a new parthenium evidence note which highlights a list of recommendations to fight the highly-invasive weed can cause severe allergic reactions in humans and livestock, may harbour malaria-carrying mosquitoes, displace native plant species and reduce pasture carrying capacities by as much as 80% to 90%.

In this picture special, we commissioned photographer Asim Hafeez to capture CABI scientists in the field as part of research which is investigating whether or not the parthenium leaf beetle (Zygogramma bicolorata) can act as an effective biological control for parthenium which is threatening food security and livelihoods in Pakistan.

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CABI publishes recommendations to fight scourge of parthenium weed in Central West Asia

Parthenium in Pakistan

CABI has published a new evidence note highlighting a list of recommendations to fight the highly-invasive parthenium weed which can have significant impacts on human health, the environment, livestock production and health and crop yields.

The report Parthenium: Impacts and coping strategies in Central West Asia, states that the aggressively-spreading weed, now classified as a ‘superior weed,’ is extremely prolific being capable of producing up to 30,000 seeds per plant – a key factor in its global spread to 48 countries including India and Pakistan.

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New study reveals the massive ecological and economic impacts of woody weed invasion in Ethiopia

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A Prosopis clearing along the Awash river

CABI scientists have revealed the massive ecological and economic impacts that the invasive alien tree Prosopis juliflora has had across the Afar Region of north eastern Ethiopia.

Dr Urs Schaffner, who is supervising lead author Mr Hailu Shiferaw for his PhD studies, contributed to the Science of The Total Environment published research which shows that the devastating Prosopis was a major reason for losses in annual ecosystem service values in Afar Region estimated at US $602 million in just 31 years.

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