. Annual report. Entomological Society of Ontario; Insect pests; Insects. 30 THE REPORT OF THE A LABORATORY APPARATUS FOR DETERMINING THE RELATIVE TOXICITY OF CONTACT DUSTS By S. H. Payne and H. T. Stultz Dominion Entomological Laboratory, Annapolis Royal, In the course of planning an experimental project designed to deter- mine and evaluate the relative insecticidal value of pyrethrum and derris dusts, A. Kelsall pointed out to us that it was desirable that a new labora- tory apparatus should be designed for the purpose of conducting biological tests with contact dusts. In developing suc
. Annual report. Entomological Society of Ontario; Insect pests; Insects. 30 THE REPORT OF THE A LABORATORY APPARATUS FOR DETERMINING THE RELATIVE TOXICITY OF CONTACT DUSTS By S. H. Payne and H. T. Stultz Dominion Entomological Laboratory, Annapolis Royal, In the course of planning an experimental project designed to deter- mine and evaluate the relative insecticidal value of pyrethrum and derris dusts, A. Kelsall pointed out to us that it was desirable that a new labora- tory apparatus should be designed for the purpose of conducting biological tests with contact dusts. In developing such an apparatus, several desirable characteristics were kept in mind. First, it should be possible to lay down a series of dust films, or give successive dustings, all of which would be of uniform density. In the second place, these dusts should be evenly distributed over the area dusted. Other important considerations were convenience of manipulation, ease with which it could be thoroughly cleaned, speed with which successive dusts could be applied and adaptability to different methods of using dust in laboratory experiments. An apparatus designed to fill these specifications has been developed during the past season. It consists, essentially, of a closed dusting cham- ber into which a known quantity of dust may be injected at a controllable rate and force and subsequently distributed evenly over the area to be Fig. 1.—Assembly of equipment for the construction of the apparatus for making toxicity tests of contact Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of Ontario; Ontario. Dept. of Agriculture. Toronto, The Society
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
