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Fogging Stored Products
The aerosol droplets created by fog/mist 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.
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