Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 THE INSECT WORLD. 137 the door closed, and bisulphide evaporated from a vessel hung up just below the top of the box. As the vapors descend, they will kill the insects infesting the plants, which may then be sent out free from all insect troubles. One dram of liquid per cubic foot of space will be about the right quantity not likely to hurt vege- tation, while killing all lice by the time the
Economic entomology for the farmer Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 THE INSECT WORLD. 137 the door closed, and bisulphide evaporated from a vessel hung up just below the top of the box. As the vapors descend, they will kill the insects infesting the plants, which may then be sent out free from all insect troubles. One dram of liquid per cubic foot of space will be about the right quantity not likely to hurt vege- tation, while killing all lice by the time the licjuid has entirely evaporated. The 'jumping plant-lice' are so called from their habit of leaping readily, though, as a matter of fact, their resemblance is rather to the tree-hoppers, and most of all they recall a miniature Fig. 99.
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