PI. 230. 



RESISTANCE TO COLD OF THE GUATEMALAN AVOCADO. 



(Persea americana.) 



The freeze of February 3, 1917, at Miami, Fla., subjected the avocados 

 at the Plant Introduction Garden to a temperature of 26.5 F. for 

 a few minutes. This temperature froze the foliage and twigs of 

 the avocado tree of the tender West Indian type but affected those 

 of the Guatemalan type much less severely and did not injure at 

 all those of the Mexican type. In the illustration Admiral Ross is 

 touching the dead brown 'leaves of a shoot coming from the West 

 Indian seedling stock upon which was budded February 7, 1914, 

 the Grande variety of the Guatemalan type. This bud has pro- 

 duced a good-sized tree in the three years and scarcely a leaf was 

 injured by the freeze. (Photographed by David Fairchild, at the 

 Miami Plant Introduction Field Station, February 12, 1917; 

 P20427FS.) 



