Electrocution
Insect electrocuters are now common. They are either suspended from the ceiling or fixed to the wall. The units emit ultra-violet rays and as the insects touch the grids, they are electrocuted and fall into collecting trays at the base of the units. The installation of electrocuters is not a replacement for good hygiene!
If electrocuters are used, they should be properly located in the area which is free from draughts and away from natural light. It should not be placed over food preparation areas where there may be a risk of dead insects falling from the unit. The ultra violet tubes within these units should be replaced at least once a year.
The following are requirements to insect electrocuters:
- Units should have an output of at least 30 watts in order to be more active to insects than other light sources.
- Advice on correct siting of the unit should be obtained from the supplier
- They should be placed in all processing areas, where food is exposed but must not be placed over unpacked food
- They should be located not more than 2.4 meters from the floor, in an area free from draughts
- They should be placed away from natural light and be fitted with a catch tray which must be kept clean
- The grids must be emptied weekly and maintained free of dead insects.
- UV tubes on insect electrocuters must be replaced at least every year
- Records must be kept of these replacements.
- The units must be left on permanently except when the facility is closed for a period in excess of 7 days.
- Where there is a fire risk or a risk of dust explosions insect electrocuters cannot be used
Elimination of Insects by Fumigation
Weevils and grain mites can be exterminated from grain silos and from stores by fumigation with, for example, formaldehyde. The use of chemicals in the treatment and elimination of pest infestation should only be carried out by a trained pest control technician.