Some companies have lost about 100 million rupees last month, the PA said.
The PA said estates in Nuwara Eliya, Hatton, Dickoya, Agarapatana and Talawakelle areas the crop intake has fallen to 40 to 45 percent of the average.
"Buyers must take note of this critical situation that is prevailing," a PA statement quoted Senarath Pahathkumbura, general manager, Elpitiya Plantations Plc as saying.
He said a wage hike in April which had incentives to improve crop was not having an effect due to bad weather.
Rains are the heaviest in 47 years, John Keells Plc, a tea brokerage in Colombo said.
"Due to the cold and wet weather experienced, the crop intakes have come down drastically," John Keells told in a report to clients.