MOSAIC OF SUGAR CA3STE A^TD OTHER GRASSES. 5 
in which 75 per cent or more of the plants had the mosaic disease. 
From this point south to Donaldsonville, however, the amount of 
infection is not heavy. Many plantations are entirely free from 
mosaic, so far as can he determined "by inspection. From Donaldson- 
ville to New Orleans an increasing amount of infection was recorded 
by the inspectors. Between Lutcher and Reserve, about 75 per cent 
of the plants in every plantation were infected. This is by far the 
most heavily infested large area in the United States. From this 
region to New Orleans and from New Orleans to the lower extremity 
of the river district the amount of infection ranges from 4 to 30 per 
cent. Just a few fields were visited where no mosaic was found. 
Fig. 1. — Map showing the location of diseased areas of sugar cane in the United States. 
In the Bayou Lafourche district mosaic was found in only about one 
out of four fields visited and where present amounted to only 1 to 8 per 
cent of the plants. In the Bayou Teche district no mosaic was 
found on plantation cane, although nearly 500 fields were carefully 
inspected. A few cases were found in this region on cane recently 
distributed by the State Sugar Experiment Station. The imme- 
diate destruction of these few sources of infection is a matter of great 
importance. No mosaic whatever was found west of Bayou- Teche 
or in Avoyelles and Rapides Parishes to the north. Thus, a very 
considerable part of the sugar-cane lands of Louisiana is still free 
from the disease, and every effort should be made to keep it free. 
In Georgia the worst infested region is in the vicinity of Cairo, 
Grady County. There the proportion of infection ranges from less 
than 1 to 75 per cent or more in fields where the disease is present, 
