Encroachment is a dirty word when it comes to golf greens and unless you have a large pool of resources at your disposal it is very hard to combat. I am talking about foreign grasses invading the putting surface and pretty much the best way to successfully prevent it is constant monitoring and hand removal, which is very labour intensive. Selective chemical controls are limited in Bentgrass greens and non-existent in Couch greens.
The West greens have a similar problem with Couchgrass constantly encroaching. There is a product registered for the control of Couchgrass in Bent greens but it is not effective on all types of Couch. It is interesting with this product that in the USA the label warns not to apply it to putting greens! I have used it since I arrived here and had good success against the susceptible varieties early on but now really only apply it to limit the invasion. Over the past 3 summers I have been trialling a new product with some success although the downside is that there is some dis-colouration of the Bentgrass. Trials are continuing this year and you will notice this dis-colouring over the next few weeks. As I don't believe it interferes with the putting surface I am happy to continue the trialling and hope we have the same success as last season..
|Regrowth of Couch after 300mm of sand removed|