"Do reprimand the brokers who look to secure prices through means outside the accepted business norms," he told the Planters' Association, representing big corporate tea producers at its annual general meeting.
"This will have a positive impact on performance and very importantly eliminate any risk of defaults against your proceeds."
It was also important to ensure brokers are given clear direction of services expected of them.
His warning came in the wake of the Colombo Tea Traders' Association tightening its bylaws to ensure greater discipline at the auctions.
Ramanayake till recently was the head of John Keells tea brokers and a broker with long years of experience.
He said