There's a news story in New Scientist this week about a weed called Mikania Micrantha which is killing off tea plants in India.
Mikania was introduced to the country in the Second World War, as a means of camouflaging airfields and has been nick-named the 'mile a minute' weed because of the speed at which it spreads.
It can only be controlled with chemicals early in the tea growing season and after that it has to be cut out by hand.
The good news is that the rust fungus puccinia spegazzinii (which attacks Mikania in South America) is probably going to be used as a bio-control in India, once it's been established that the fungus isn't going to start decimating any native vegetation.
