During his day-long visit here today, Kumar demanded that prohibition be imposed in Uttar Pradesh, which goes to polls early next year.
His visit today and other recent tours of the state, however, did not go down well with ruling SP leaders.
Kumar had visited Varanasi a few days back.
"The manner in which Nitish Kumar has been targetting UP, coming here every now and then, his comments against the SP government will embolden communal forces against which the UP government is fighting," SP spokesman Rajendra Chaudhary said.
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By making "frequent trips" and "misleading" the people here, Nitish Kumar is "strengthening communal forces", he said.
Chaudhary said Kumar spoke of prohibition but did not say a word on development.
"Don't worry Akhileshji (the UP Chief Minister)...Ensure total prohibition. When liquor was banned in Bihar, people had problems for a few days. But, subsequently there was no problem," Kumar said addressing a farmers' conclave here.
"I have written to the UP chief minister in this regard," he said, adding he was awaiting a reply to his letter.
Earlier, addressing a farmers' conference here, Kumar asked Prime Minister Narendra Modi to implement total prohibition in all BJP-ruled states like in his home state Gujarat.