Millworkers' Asthma: Allergic Responses to the Grain Weevil (Sitophilus granarius)

Millworkers' asthma: allergic responses to the grain weevil (Sitophilus granarius).

Two laboratory workers, who spent a considerable time each day handling grain infested by the grain weevil (Sitophilus granarius), developed allergic responses to this insect varying from rhinitis and pruritus to marked asthma. These findings suggested that weevil protein present in mill dust could result in sensitization in those exposed continuously. A pilot study was therefore undertaken on ...

Asthma Caused by the Grain Weevil.

The grain weevil (Sitophilus granarius) caused symptoms of allergic rhinitis and asthma in two laboratory workers, one after exposure to weevil dust for only six months and the other after three years. The former worker also noticed sneezing when she was cooking with National Flour. Skin testing with extracts of the grain weevil faecal dust gave positive skin responses. The antibodies were succ...

Mortality effect of BT extracts and esterase variability in three stored grain insects: Callosobruchus chinensis, Sitophilus granarius and Tribolium castaneum

Bioassay was conducted to determine the susceptibility level of the adults of Callosobruchus chinensis, Sitophilus granarius and Tribolium casteneum against four BT isolates (1i, 27s, 27f and HD73) where mortality effects were counted from 24 to 192 hours (8 days) at 24 hours of intervals. All strains of BT were highly active against C. chinensis and the LC50 were found to be 0.30, 0.73, 0.62 a...

Pulmonary hypersensitivity to the grain weevil.

The effects of topical application of two essential oils against Sitophilus granarius and Tribolium confusum

Bioassays were conducted to assess the contact toxicity of two plant essential oils against adults of Sitophilus granarius (L.) and Tribolium confusum Jacquelin du Val. Essential oils were extracted from seeds of Carum copticum L. and Cuminum cyminum L. Contact toxicity was assessed by topical application and adult mortality was counted 1, 2, 6 and 24 h after exposure. Bioassays were carried ou...