Weed and Algea on the Lake
Published 04:46 on 17 Jul 2019
Just a quick note to explain the current situation with weed. I know it is very frustrating to get weed when racing and I also am aware that the membership is asking what else we can do. This evening as Tuesday racing was abandoned due to lack of wind, I have gone over the lake looking for weed. I guess there are a few things to say.
There are clearly patches of weed on the surface a few clumps as well as broken strands. None of this looks particularly healthy. This is Canadian pond weed and one issue with it is that it will break off and float around the lake especially in hot weather. It will also propogate in this way. Having said this, I did not see the weed growing up as it has in previous years including last year. I have put up the current RYA advice regarding Canadian pondweed on the website. There are several approaches to controlling it as you can see. Currently I don't believe cutting has anything to offer except to take up a lot of members time, notwithstanding the cost of a cutter which is approximately 10 x that of the dye. What may have a role is harrowing the bottom of the lake in February and we will discuss this at the exec. For a lake our size this is probably a full week's work and we would need to build a harrow.
For the time being we are putting a double dose of dye in the lake this week and I would ask all members to pick up weed from the banks or if they pass it on the lake. Unfortunately, Canadian Pondweed is an invasive foreign species. The only way to eradicate might be to drain the lake completely with all the disruption that would cause – probably one lost season – and even then there are no guarantees it will work. Dyeing, I believe has controlled the weed significantly at a reasonable cost in money and manpower. Cutting/mowing is likely to stimulate growth and would come at a significant cost in manpower and money. Mowing rotas are required at some other clubs for several full days a week.
Finally, there appear to be some possible algal blooms. I have had a good look and I am not convinced that this is blue green algae but please be alert for it. You can sail if it is present but consider the health of your pets and children and avoid heavy "scummy" areas especially if they have a bluish tint. This will disappear with a change in weather and paradoxically will help reduce pond growth.
As always feel free to challenge, debate and make suggestions. I share your frustrations.
All the best
Last updated 04:46 on 17 July 2019