10 BULLETIN 28, PORTO RICO EXPERIMENT STATION. 
There were 610 young trees which had been set by the overseer. 
Of these, 254 showed Stilbella spots. On some seedlings every leaf 
was diseased. No spotted leaves were seen on the remaining 356 
trees; it is probable, however, that the shock of transplanting, 
which is usually done by simply pulling up the seedling and setting 
it in elsewhere, added to the tendency already present of the diseased 
leaves to drop, had caused the loss of diseased leaves from many 
trees that now failed to exhibit evidence of infection. 
Where not more than two spotted leaves were found on the old 
trees, the diseased leaves and those near them were removed. Where 
three or more spotted leaves were found the trees were cut down 
and removed. The young trees which showed spotted leaves were 
cut to 6-inch stumps, and all leaves were picked from the other 
young reset trees. The overseer was instructed to clean the plat 
of weeds and to keep it clean. 
The sixth inspection was made on November 15, 1920. The plat 
was overgrown with grass and weeds of all sorts, and the overseer 
stated that he had no time to give to it. Though the coffee renews 
from the stumps had by no means attained full development they 
had made excellent growth. With the exception of the irregularity 
with which the trees were scattered, the plat presented the general 
appearance of a young plantation of very vigorous, healthy trees. 
Some of the trees showed remarkably fine development, being ap- 
proximately 12 feet high and having a trunk the size of a man's 
wrist and branches that had as many as 15 nodes (PI. IV). These 
trees were producing a pound of marketable coffee. A number of 
trees which were not so tall bore half a pound of coffee, and others 
bore still less. The production on the whole was fair. The new 
trunks with their branches from near the base up were a striking 
contrast to the old near-by unpruned trees with their high laterals ; 
and the condition of the former for the production of the next crop 
far surpassed that of the latter. 
No infection was found on the coffee trees which were in the cen- 
tral part of the section above the path where the overseer had failed 
to replant. Near and below it, where the diseased seedling trees had 
been carried in and planted for some months, many old trees showed 
no infection. However, on other trees scattered here and there some 
Stilbella-spotted leaves were found. In some instances only several 
leaves out of many hundred shoAved disease spots, whereas on others 
approximately a third of the branches bore spotted leaves. Naturally 
reinfestation was to be expected as the result of the thorough inocula- 
tion given by the overseer some 16 months before. Reinfestation was 
also furthered through the presence on the weed-covered land of many 
host plants, which conveyed the leaf disease from one coffee tree to 
the next. 
