Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ches maybe rid of the pests in the same way, covering the plants for twoor three hours with a frame or box, and evaporating a smallquantity of the bisulphide. A fumigating-box made of wood,canvas, tin, or other material, large enough to contain pottedplants of good size, should be in every greenhouse and number of pots of infested-plants may be placed in such a box, THE INSECT WORLD. 137 the door closed, and bisulphide evaporated from a vessel hung upjust below the
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ches maybe rid of the pests in the same way, covering the plants for twoor three hours with a frame or box, and evaporating a smallquantity of the bisulphide. A fumigating-box made of wood,canvas, tin, or other material, large enough to contain pottedplants of good size, should be in every greenhouse and number of pots of infested-plants may be placed in such a box, THE INSECT WORLD. 137 the door closed, and bisulphide evaporated from a vessel hung upjust below the top of the box. As the vapors descend, they willkill the insects infesting the plants, which may then be sent outfree from all insect troubles. One dram of liquid per cubic footof space will be about the right quantity not likely to hurt vege-tation, while killing all lice by the time the liquid has entirelyevaporated. The jumping plant-lice are so called from their habit ofleaping readily, though, as a matter of fact, their resemblance israther to the tree-hoppers, and most of all they recall a miniature Fig.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
