. Circular. Agriculture; Agriculture -- United States. Fig. 17.—Parsnip at- tacked and deformed by the gallworm. This disease attacks the roots of hundreds of other kinds of plants. If such roots are used for food the refuse should be cooked or destroyed. Such ma- terial can not be intro- duced into New South Wales and other pro- gressive States. (After ). Fig. 18.—Roots of salsify, showing enlargements caused by the gallworm. A number of foreign countries have legislated against the introduction of plants and farm produce infested with this disease. (After George F. Atkinson.) The pa
. Circular. Agriculture; Agriculture -- United States. Fig. 17.—Parsnip at- tacked and deformed by the gallworm. This disease attacks the roots of hundreds of other kinds of plants. If such roots are used for food the refuse should be cooked or destroyed. Such ma- terial can not be intro- duced into New South Wales and other pro- gressive States. (After ). Fig. 18.—Roots of salsify, showing enlargements caused by the gallworm. A number of foreign countries have legislated against the introduction of plants and farm produce infested with this disease. (After George F. Atkinson.) The parasite causing the disease is a very small unsegmented worm wiiich invades the roots of many different plants, causing malforma- tions and often seriously hindering the grow^th of the plants. The nematode multiplies very rapidly under favorable conditions. The life cycle may be completed within a few^ weeks and each female may lay as many as 500 eggs. The nematode may be carried from place to place in the roots of Hving j)lants, in potatoes, on soil on the roots of nursery stock, or with potted plants. It may also be carried from one field to another in earth on farm implements or in irrigation water. Manure from yards where diseased roots or tubers have been fed may carry the (Clr. 91]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Plant Industry. Washington, D. C. : U. S. Dept. of Agriculture, Bureau of Plant Industry
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Keywords: ., bookcentury1900, bookdecade1900, booksubj, booksubjectagriculture
