Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0022-0493

Maize heavily infested with a complex of the rice weevil, Sitophilus oryza (L.) (-Calandra oryzae L.), Sitotroga cerealella (Oliv.), the Angoumois grain moth, and Tribolium castaneum (Hbst.) the red flour beetle, was fumigated with 1: 2, 1 :4, 1:6, and 1: 8, by weight, mixtures of acrylonitrile: carbon tetrachloride at dosages of 0.05, 0.10, and 0.20 ml. of fumigant per 3 liters of grain. Similar maize was fumigated with a 3: 1, by volume, mixture of ethylene dichloride:carbon tetrachloride at a dosage of 0.40 ml. per 3 liters of grain as a standard for comparison. The grain was fumigated for 24 hours. Counts were made of living adults of each species 24 hours and 6 weeks after tire fumigants were applied. The two higher dosages of the 1: 2 mixture and the highest dosage of the other mixtures were considered effective against all three species at the end of 24 hours. Only the highest dosage of the 1: 2 mixture and the standard fumigant were considered satisfactory against the three species at the end of 6 weeks. Indirect evidence of competition between S. oryza and S. cerealella was found. As the low dosages and concentrations of acrylonitrile were not satisfactory, the use of such mixtures as general grain fumigants in Colombia does not appear practical.

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