. Annual report. Entomological Society of Ontario; Insect pests; Insects. 66 REPORT OF THE ENTOMOLOGICAL LABORATORY FUMIGATIONS Determination of Fumigant Concentrations The fumigation equipment used in the laboratory study has been described in the paper immediately preceding this (5). A number of non-fumigated bags of Indian peanuts from the main consignment were obtained and subjected to methyl bromide fumigation in the steel experimental chambers. Before and during fumigation these bags were pre-conditioned. 172 Ft Longitudinal plan of package freighter SS. "Battleford". Fig. 1. D
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 66 REPORT OF THE ENTOMOLOGICAL LABORATORY FUMIGATIONS Determination of Fumigant Concentrations The fumigation equipment used in the laboratory study has been described in the paper immediately preceding this (5). A number of non-fumigated bags of Indian peanuts from the main consignment were obtained and subjected to methyl bromide fumigation in the steel experimental chambers. Before and during fumigation these bags were pre-conditioned. 172 Ft Longitudinal plan of package freighter SS. "Battleford". Fig. 1. Diagram of lake freighter used in fumigation of 1655 tons of shelled peanuts. The circled numerals show the position of the sampling points for the fumigant concentrations. The points are described in the text. as closely as possible at the temperature and humidity prevailing during the field treatments. The dosages of fumigant corresponded also. In order to study the effect of sorption bv different amounts of the commodity, separate fumigations were made at the same dosage of methyl bromide in an empty chamber, or with a load of two or three bags: to determine sorption by the jute itself a test was also made with three empty bags. The thermal conductivity analyser was connected to the copper sampling tubes on the outside df the chambers by means of 3 feet of polythylene tubing with 3/16 inch internal diameter. One copper tube led to the free space sampling point above the load, and two or three others to the centre of the bags of peanuts, according to the number present. After passing through the analyser, the gas-air mixture was in all instances returned to the free air space in the chamber through a separate tube, not used for sampling. In the fumigation corresponding to the one on the lake ship, the two fans in each ? chamber were run for 30 minutes at the beginning, and thereafter the larger fan in the main chamber was operated for 30 minutes every two hours during the day
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
