Ann Arbor – Ann Arbor City Council has agreed to spend 114-thousand dollars to treat the city's stormwater system to kill mosquitos that could transmit the West Nile Virus. The money will be used to purchase and apply a larvacide. The larvacide will be applied this month, and again in June, July, and August. The allocation will cover the expense of a September application, if necessary. The Centers for Disease Control and Prevention and the Washtenaw County Health Department had suggested the treatments.