questions: query about red ant problem in potato. 
 answers: this pest is generally controlled by the application of pesticides in the soil. chlorpyrifos (dursban) 20 ec @ 5ml/lit of water for 3 times or carbaryl (sevin) 85 wp @ 3gm/lit of water for 3 times at 10 days interval starting from 45 days after sowing of potato can minimize red ant infestation in potato significantly.