With farmers in Madhya Pradesh, Maharashtra, Rajasthan and Haryana up in arms against respective State Governments demanding crop loan waiver, resentment among farmers is brewing in Uttar Pradesh. The farmers have threatened to block supply of vegetables and milk in cities demanding a CBI probe into killing of six farmers in Mandsaur. Bharatiya Kisan Union spokesman Alok Verma told The Pioneer that the outfit will be holding its national executive from June 16-18 in Haridwar where it could decide on protest but till then an appeal has been issued to farmers not to send their produce to cities.