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Pest status of household and structural pests is based primarily on their persistence in the urban environment. Persistence of pest populations is determined by availability of reservoir habitats that harbor large and stable populations, which supply individuals to maintain small, local infestations...

Fifteen randomly chosen flats in Ledeè n. S. were examined for the presence of house dust mites in 1997-98. Only one species, Dermatophagoides farinae Hughes, was found in one flat in a brick onefamily two-story house, 30 years old, 300 m above sea-level. This flat was therefore submitted to a detai...

House dust mites are one of the main reasons for allergies which makes an efficient control necessary. The commonly used compounds are pyrethrins, pyrethroids but also compounds as benzyl benzoate. Furthermore the acaricidal effects of some solvents (e.g. propylenglycol, diethylenglycolmonobutylethe...

Tiny, free-living mites have long been recognised as one of the most important sources of allergen of house dust causing atopic and bronchial asthma, rhinitis and dermatitis in susceptible persons. Among several species of these mites Dermatophagoides pteronyssinus and D. farinae (Acari: Pyroglyphid...

House dust mites are together with pets the most important source of allergens in dwellings in western Europe. In a recently developed semi-natural test system, mites may be studied in an environment comparable to the dwelling situation. In this laboratory test, it should also be possible to determi...

In the home environment allergenic mites are well known inhabitants of textiles and food. In humid dwellings mites and moulds are found on walls. In autumn (1990) textiles and wall surfaces were sampled in eight rooms of four dwellings. The same was done in winter (1990-1991), in seven rooms. Sampli...

Two pyridazinone derivatives, pyridaben and NC- 194, were found by medium mixing test to be potent chemicals which inhibited the growth of Dermatophagoides population. Pyridaben {2-tert-butyl-5- (4-rerz-butybenzylthio)4chloropyridazin-3-(2H)-one}, which is a new agricultural acaricide, suppressed 90...