Grain Mites

Grain Mites

 

or flour mites (Tyroglyphoidea or Aca-roidea), superfamily of arthropods from the order Acari-formes and the class Arachnida.

Grain mites are small—0.2–1 mm; there are about 200 species spread throughout the world. The mites dwell in the soil, in accumulations of rotting matter, in burrows and nests of animals, and on the roots and green parts of plants, feeding on plant matter and microflora. They multiply intensively in humid areas.

Grain mites are characterized by a special development phase, the hypopus, into which the nymph turns under such unfavorable conditions as insufficient moisture or food. Covered by a carapace, the hypopus is very resistant to external effects; it does not feed but migrates by attaching itself to insects and other animals. When favorable conditions are restored, the hypopus molts and begins a new colony of grain mites.

Grain mites are carried into storage areas from the fields during harvesting. Grain and cereal products are damaged by the long mite (Tyrophagus noxius, Tyrophagus per-niciosus), the flour mite (Tyroglyphus farinae), the dark-legged mite (Aleuroglyphus ovatus), and others. Onions are damaged by the bulb mite (Rhizoglyphus echinopus); cheese by the cheese mite (Tyrolichus casei); and wine by the wine mite (Histiogaster bacchus), which dwells on the surface of wine.

Grain mites, when ingested with food, irritate the walls of the gastrointestinal tract and, when inhaled, cause asthmalike symptoms.

Protection of foodstuffs against grain mites is based on the creation of unfavorable conditions for them such as low humidity and temperature and fresh-air ventilation. Chemical compounds—acaricides—are also used to eliminate grain mites from planting grain.

REFERENCE

Zakhvatkin, A. A. Tiroglifoidnye kleshchi (Tyroglyphoidea). Moscow-Leningrad, 1941. (Fauna SSSR,vol. 6, issue 1.)

A. B. LANGE

References in periodicals archive ?
Well, after much research, I found out that I had grain mites.
The stored grain mites which are one of the important pests of stored grains can modify the chemical composition of the stored wheat.
The stored grain mites are major pests of wheat during its storage and accountable for the qualitative as well as quantitative losses (Mahmood et al.
The present findings can be compared with those of Sinha and Wallace (1966), Tabassum and Ahmed (1989) and White and Jayas (1993) who reported the stored grain mites cause an increase in the moisture of stored grains because of their feaces content, fungal growth and other metabolism.
Many studies demonstrated that species of the stored grain mites attack the germ and consume very little portion of the remaining grain, thus causing up to only 3% of weight reduction (Solomon, 1946).
Many commercial farmers are unaware of the damage and losses caused by the stored grain mites mainly due to their minute size (Palyvos and Emmanouel, 2006).
The existence of stored grain mites has been reported from all over the world (Mahmood, 1992; Haines, 1997; Kucerova and Horak, 2004; Hubert et al.
The samples collected from all the localities of Tehsil Toba Tek Singh were found to be infested with stored grain mites at the initial stage (Fig.
Considerable literature outlining the susceptibility of cereals and infestation of stored grain mite has been described by Pagliarini (1979), Prickett (1992), Emmanouel et al.