COFFEE VARIETIES IN PORTO RICO. 27 
may be increased by closer planting than is advisable for the other 
coffees. While Mocha is of excellent cup quality and may be grown 
for home use, it should not be planted for commercial purposes. San 
Ramon is of very dwarf, stocky, and vigorous habit, and may be 
useful for planting in windy locations less suitable for varieties of 
taller, spindling growth. The bean is considerably smaller than that 
of Porto Rican. 
In sections suffering greatly from ravages of the leaf miner it 
may be advisable to plant coffees of the Liberian group, the foliage 
of which is less subject to leaf miner attacks, presumably on account 
of the leathery texture of the leaf. Excelsa seems to be the most 
promising of this group so far tested. Certain individuals of 
Dewevrei have shown themselves very prolific and give much 
promise. 
The Robust a and related varieties are planted in certain coffee- 
growing countries for their heavy production. While the average 
production for this station has not been high, the tests have been of 
shorter duration than for the Arabian varieties. The yield of cer- 
tain individuals has been high, indicating either heavy-yielding 
strains or heavy yields for plantings under favorable conditions. 
Notwithstanding the many points in its favor, Robusta coffee is 
inferior in cup quality, a fact which should be borne in mind by 
those contemplating planting it. 
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