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Control of tribolium castaneum adults and cryptolestes ferrugineus adults and eggs with hydrogen phosphide in grain at temperatures between 1 celsius and 11 celsius



Control of tribolium castaneum adults and cryptolestes ferrugineus adults and eggs with hydrogen phosphide in grain at temperatures between 1 celsius and 11 celsius



Manitoba Entomologist 9: 23-28



Wheat at low temperatures was treated with hydrogen phosphide (PH3) to control adult T. castaneum and eggs and adults of C. ferrugineus. At temperatures of 8.5-11.3.degree. C, a 100% kill of adult T. castaneum and C. ferrugineus was obtained when PH3 concentrations rose from 0 to more than 100 ppm in 1 day. There was also 100% kill of adult C. ferrugineus when gas concentrations rose from 0 to more than 100 ppm during the course of 2 days. At these temperatures, C. ferrugineus eggs survived gas concentrations which reached 900 ppm and then declined to 720 ppm during 4 days. The eggs also survived an exposure period of 7 days when gas concentrations reached a maximum of 110 ppm on day 3 and then declined to 50 ppm on day 7. At temperatures of 1.1-7.2.degree. C, a 100% kill of adult C. ferrugineus was obtained only after a 4-day exposure to PH3 though gas concentrations reached 540 ppm on day 4. At these temperatures C. ferrugineus eggs survived 7 days at gas concentrations which reached 520 ppm on day 4 and then declined at 400 ppm on day 7.

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Accession: 005051785

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