Located in Oklahoma. Bermuda lawn. I had a customer call and say he wanted to start getting weed control back in october of 2019. At that time he was over ran with crabgrass. Very small amount of bermuda coming through the canopy of the crabgrass. At that time I only sprayed prodiamine at a 21 oz/acre rate. Came back in February with the 16oz/ acre rate of prodiamine, .25oz/acre rate of msm and 1.25oz/per 1k rate of Triplet SF. On both of those days I sprayed that same mix on more than 10 other yards. I went out today and spread some fertilizer. This yard has literally no green anywhere. The rest of my lawns, including all that I spray with the same mix on the same day are greening up. The weather has been all over the place with us having a 89° day back to back then 2 days later it was 31°. Im obviously going to see what happens with the higher consistent temps and fertilizer but what would cause it to be so far behind or even dead compared to the other lawns.