Care and intelligence are especially needful with certain insecticides such as poisonous gases, or the operators may suffer. [Please select]
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A BOOK ON THE DISEASES OF PLANTS, FUNGICIDES AND INSECTICIDES, ETC. [Please select]
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Bedbugs are exceedingly difficult to fight, owing both to their ability to withstand the action of many insecticides and owing also to the protection afforded them by the walls and the woodwork of the room. [Please select]
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We have now considered a good many insecticides more or less suitable to our purpose, but there still remains the unsolved problem as to which is the best. [Please select]
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