Farm officials said flooding destroyed 5 percent of expected fourth-quarter production in rice-producing provinces.
The coast guard said seven people died when a boat sank in the central Philippines.
Authorities in the coastal town of Casiguran, where Koppu made landfall at the weekend as a category 4 typhoon, deployed heavy equipment to clear roads of uprooted trees, toppled electric posts and debris.
Strong winds reduced people's homes to matchwood, leaving them with nothing, said one survivor, as residents began work to repair homes.