Publisher's Synopsis
Excerpt from Some Insects Injurious to Truck Crops
After the larvae or young commence to appear, the plants showing the greatest injury are treated with the dust, this application usually being held sufficient for some time. The lancl-plaster application is from three to four times as expensive as a Paris-green spray of equal strength, and in several cases in the Norfolk region the application of the unnecessary plaster to the already acid soil has produced a state of disease in the cabbage crop following the potatoes which has lessened the production to a considerable degree. In the case of a spray this acidity is not imparted to the soil and injury to cabbage is thus avoided.
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