This experiment tested the indoor toxicity effect of boscalid,fludioxonil and their compound on Botrytis cinerea of strawberry by growth rate method,and evaluated the synergism by Wadley method,and field control effect of boscalid and fludioxonil compound was also evaluated. The results showed that the compound mass ratio of boscalid and fludioxonil as 1:1,5:1,3:1,2:1 and 3:2 exhibited a significant synergism against Botrytis cinerea of strawberry.When the mass ratio was 1:3,1:4,1:5,4:1,their compound of boscalid to fludioxonil showed an additive effect. The 3:1 mass ratio of boscalid and flud...