The tea cake disease of tea is called tea cake disease by local people. Generally, triadimefon is used for control, but the effect is not good, but now it is recommended to spray 25% benzyl bromide and 25 grams in a bucket of water for best control. I have never used biological agents. The residue of benzyl bromide is very small. It should not be used 10 days before harvesting. The residue is within the requirements. I know relatively little about biopesticides, and the few currently known ingredients have average effects. My customers have all sold them, such as eugenol and osthole.