regulation of positive chemotaxis to cAMP by DIF-1 negative regulation of positive chemotaxis to cAMP by chlorinated alkylphenone negative regulation of positive chemotaxis to cAMP by DIF-1 2010-05-17T08:45:03Z biological_process GO:0061127 dph Any process that decreases the rate, frequency, or extent of directed movement of a motile cell or organism up a concentration gradient of 3',5'-cAMP by the action of DIF-1. DIF-1 is a chlorinated alkylphenone.