The Urban Environment

The aerosol droplets created by Dyna-Fog® machines have many applications on foodstuffs and other products such as leather and tobacco in storage. The thermal fogs produce small droplets that will carry into nearly all of the airspace in a building. ULV droplets will also penetrate airspaces without remaining in the air for such a long period of time, and with some machines the droplets can be produced in sufficient numbers to create a wetting effect on surfaces.

Treatment of Empty Stores
Thorough cleaning of the store is an essential prerequisite to successful insect control to ensure that insects are protected by layers of dust. After cleaning, a good kill of exposed insects can be achieved with a fogging ULV machine. Where a residual deposit is also required, a ULV machine that produces the right size droplets to give a good knockdown in sufficient numbers as well as give a wetting effect t surfaces is preferred. A ULV machine is also preferred when the building is constructed of materials which have deep crevices (brick or wood ) where the greater wetting ability of the ULV sized droplets will give greater penetration.

Treatment of Bagged Produce and Processing Rooms
Normally, only natural pyrethrins are permitted to be used and a suitable formulation for either thermal fogging or ULV should be selected. Only flying insects or those on the surface of the bags will be controlled. The best results are usually obtained with an oil-based product containing at least 3% pyrethrum. If a water-based product is used, a carrier should be used to prevent the droplets from evaporating in the atmosphere before they hit the target.

Treatment of Bulk Stored Potatoes
A thermal fog can be used to apply sprout suppressant of potatoes stored in bulk or in boxes. In large bulk stacks, forced air is necessary to assist the fog through the stack. When the stack is covered with straw for frost Protection care should be exercised in handling the machine to ensure that the straw does not ignite.

Choosing the Right Product
The ULV equipment is ideal for applying disinfectants or mold inhibitors into empty cold stores prior to filling with produce. A range of thermal (hot) fogging machine is available which vary from small hand-held to truck mounted machines. Fogging should only be done in closed building which should not be opened for 3-4 hours. The Dyna-Fog® Cyclone produces small droplets of the optimal size to get the best knockdown effects of natural pyrethrum. The machine has a "throw" of about 60 ft. (20m). Where regular treatments are required, these machines can be permanently installed and controlled by a timer for automatic operation. The Dyna-Fog® Tornado with its larger pressurized tank produces droplets more suitable for leaving a residual droplet as well as giving good knockdown. The Dyna-Fog® MINI-Pro 8HP combines the advantages to the Cyclone and Tornado for large scale application. By settling the nozzle pressure, the choice of small or large droplets can be made. The Dyna-Fog® MINI-Pro 8HP is very versatile when mounted on its wheel kit. The Dyna-Jet® L30 is totally electrically powered for emission free operation. The Dyna-Fog® NIGHTSTAR® can produce small droplets for good knockdown, or larger droplets for depositing a residue to extend the period of control. By programming the controls the application can be made without the operator being in the building. Where there is sufficient airspace to allow the droplets to circulate, buildings of up to 60,000 square ft. (6000 m˛) can be treated with as little as 1˝ - 3 gallons (6-12 liters) of prepared formulation. Treatment with ULV machines should be done in closed buildings which should not be opened for 1-2 hours. Adequately ventilate before unprotected people re-enter the buildings.