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Improving lives by solving problems in agriculture and the environment
Staff image of Philip  Weyl

Philip Weyl Research Scientist, Weed Biological Control

T: +41 (0)32 421 48 76


Rue des Grillons 1 CH-2800 Delémont, Switzerland


MSc in Entomology, PhD in Entomology

After completing my PhD at Rhodes University, South Africa in 2015, working on the origins of a submerged macrophyte Myriophyllum spicatum in southern Africa, I worked for 18 months in a post-doc position with the Rhodes University Biological Control Research Group, where my research was focused on post release evaluation of biological control agents on aquatic weeds in Africa. I started at CABI in June 2016 where I am based in the weeds section and involved in field surveys in Europe and Asia as well as host range and impact studies of potential biological control agents on several target weeds.

Project image: Controlling Japanese knotweed in Great Britain

Controlling noxious Russian knapweed in the North America

Russian knapweed is one of several invasive plants of rangelands that arrived in North America as a seed contaminant in the 19th century, in this case from Asia. Biological control is often a good approach for these plants, but a nematode species introduced in the 1970s proved ineffective against Russian...
Project image: Controlling Japanese knotweed in Great Britain

Stemming the spread of Russian olive

Russian olive is a significant invasive weed in North America but is perceived as a useful and attractive tree by some stakeholders. It is especially a problem in western parts of the USA where it affects many natural habitats, altering the ecosystem and its functions. Biological control is a useful approach...
Project image: Controlling Japanese knotweed in Great Britain

Giving dyer’s woad the blues

Dyer’s woad is an ancient source of blue dye and was grown as a textile dye crop in Europe and Asia for centuries. It was introduced to North America by early colonists, but escaped cultivation. Today, it is recognized as a serious weed in the western USA. One reason for its impact is the absence of the...
Project image: Controlling Japanese knotweed in Great Britain

Controlling hoary cress in the United States

Trade in seed brought crops to new regions, but many weeds were spread by this route too. Hoary cresses, also known as whitetops, arrived in the USA as contaminants of seed from Eurasia. They are now aggressive invaders of crops, rangeland and riverbanks. One reason for this is the absence of the natural...