Looks to me like you have a very fertile pond like mine. Short term spraying with cutrine will kill the algae. Only do half the pond at a time and wait a few weeks to do the other half. This will prevent an oxygen crash and fish kill. Long term solution is reducing the nutrient load and adding aeration to increase your natural bacteria's ability to break down the organics. Weeds can be targeted with specific herbicides.

"If people concentrated on the really important things in life, there'd be a shortage of fishing poles." Doug Larson