Size: 1mm
Colour: Light brown or grey
Information
Psocids or Booklice (Liposcelis bostrychophilus) which are often between 1 and 2mm long might be found in dry foods. They are not caused by poor hygiene and are just as common in the cleanest of homes, either old or new. They prefer to live in dark, warm, humid places – such as the folds of packaging in food cupboards and dislike light or disturbance. They feed on a wide variety of foods, such as flour and also the microscopic moulds that develop in humid conditions. They may live for about 6 months during which time the female may lay up to 100 eggs. Several independent studies have shown that the psocid species, which causes the majority of problems in homes, is rarely found where food is produced.
Control
Booklice are not easy to destroy by direct attack. Insecticides with no residual effect (such as fumigation) are of little value, since reinfestation from natural sources is very probable, where conditions are suitable. The use of powder insecticides is only slightly more effective. The simplest and most certain method of destroying booklice from a dwellinghouse is to ensure that it is so dry that the minute moulds and fungi, which serve as their food, cannot grow. The affected areas should be adequately heated and ventilated in order to reduce the humidity. If it is difficult or impossible to obtain absolutely dry conditions, the moulds may be destroyed by the use of a fungicide.
Precautions
It is best to keep all dry foods in cool, ventilated cupboards. If this is not possible, make sure that your cupboards are always free from condensation and damp. If you notice that condensation occurs in your kitchen, particularly during cooking or washing, open your windows. If the problem continues, it may be necessary to take additional precautions. Advice on preventing condensation should be sought from Environmental Services on telephone 0161 253 5353.
Any potential hiding places should be sealed with paint or mastic. Many fitted kitchen cupboards are made from laminated chipboard and the surfaces which are not on view tend not to have a laminated finish. These unfinished edges can provide crevices for the psocids to hide in and should be sealed with a coat of paint or varnish.
Whenever insecticides are used, read and follow the instructions on the label carefully.
