I tried the link above and it didn't work due to extra hidden characters. However if you search the New Scientist site for "Water hyacinth" it is the top article on the list. Not sure if it will work, but I've also re-pasted the link: https://www.newscientist.com/article/dn3703-weevils-save-lakes-from-water-hyacinth-pest/
Published by Jeremy Biddle, Engineering Director at Bluewater Bio
I tried the link above and it didn't work due to extra hidden characters. However if you search the New Scientist site for "Water hyacinth" it is the top article on the list.
Not sure if it will work, but I've also re-pasted the link: https://www.newscientist.com/article/dn3703-weevils-save-lakes-from-water-hyacinth-pest/