. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . " Hopper-dozer" for man-power. once wet with kerosene they die in a few minutes. These machines are useful only on comparatively level ground, but they often destroy great numbers of injurious insects when properly handled. Finally, we may say a few words concerning fumigating appa- ratus. No two outfits are quite alike, and the work to be done must in every case determine the character of the machinery. The essentials are a gas-tight tent, and a means
. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . " Hopper-dozer" for man-power. once wet with kerosene they die in a few minutes. These machines are useful only on comparatively level ground, but they often destroy great numbers of injurious insects when properly handled. Finally, we may say a few words concerning fumigating appa- ratus. No two outfits are quite alike, and the work to be done must in every case determine the character of the machinery. The essentials are a gas-tight tent, and a means of placing it over the plants to be fumigated. The method of producing the gas is elsewhere described. For the tent, eight-ounce duck, saturated with boiled linseed oil, is recommended, and it should be made to close so tightly that little gas can escape through the lap. As for the machinery to place it over the tree, that must be in all cases determined by the circumstances ; but Fig. 483 will give an idea of the way things are done in California. The outfit is an expensive one, and will pay only when an entire neighborhood can be supplied by it.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1896
