An applicator for dry particulate matter has an operating module body having a handle and trigger. The applicator lacks a back-pack and particulate matter is instead stored in a flexible tube. A flow path in the body is partially blocked and fully opened by a battery operated reciprocating gate valve that can be operated by the trigger on the body's handle. The tube is long enough to pass around a user's neck when the operating module is held by a hand of the user's extended arm, so that the free end can be manipulated by the user's other hand. A microprocessor in the body is adapted to regulate the operation of the gate valve to adjust the quantity of particulate matter dispensed according to user inputs.