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BULLETIN 829, U. S. DEPARTMENT OE AGRICULTURE. 
Mississippi offer no difficulty at all. They can be destroyed with 
practically no loss to the owners, and the assurance of healthy crops 
in the future more than offsets the inconvenience of growing some 
other crop on the land now occupied by infected cane. The success 
of the measure in Florida is made possible by the present organization 
of the State plant board, which has already met the test of success- 
fully handling more serious problems. 
ELIMINATION BY PLANTING IMMUNE VARIETIES. 
Success of the control measures suggested up to the present depends 
entirely upon the whole-hearted cooperation of all cane growers. 
Fig. 4. — Map of Florida, showing the location of diseased areas of sugar cane in that State. 
There yet remains a method, applicable only to certain regions, by 
which a planter can make himself wholly independent of any default 
on the part of his neighbors. A few varieties of sugar cane have boon 
discovered that are absolutely immune to mosaic under all condi- 
tions. Most of them are of the type referred to as Japanese cane. 
Their origin is obscure. They have certain characteristics in com- 
mon. All are tall growing with slender stalks. They stool abund- 
antly, ratoon well, and produce an enormous tonnage. The sucrose 
content is not so high as in some of the broad-leaved canes, but in 
sugar per acre they take first rank with the best existing varieties. 
The Kavangire, Zwinga, Uba, Cayana 10, and numerous others 
imported by the office of Foreign Seed and Plant Introduction are 
