Every grower shall pay the excise taxes on bright flue-cured and all type 21 dark-fired tobacco to the warehouse or handler where and when the tobacco is first sold. Each warehouse or handler is designated an agent of the Department for the purpose of collecting such excise tax. The tax shall be paid to the Department, to the credit of the Tobacco Board, on or before the tenth day of the month following its collection. Taxes paid on bright flue-cured tobacco shall be promptly paid into the state treasury to the credit of the Bright Flue-Cured Tobacco Promotion Fund and taxes paid on type 21 dark-fired tobacco shall be promptly paid into the state treasury to the credit of the Dark-Fired Tobacco Promotion Fund.