426 JOURNAI, OF FORESTRY 



Eucalyptus longifolia Lind. IVoolly-butt 



The woolly-butt is represented by nine three-year-old trees at Del 

 Rosa. Since the freeze most of these have made very rapid normal 

 growth, though all the leaves were more or less injured. One small, 

 scrubby tree sent up a few sprouts from the root collar, while four 

 others have sprouted along the stems. 



Eucalyptus rudis Endl. Flooded Gum 



The only flooded gum found was at Del Rosa. Here there are four 

 trees, the smallest being 2 feet high. All the leaves were destroyed, 

 and the tips of the branches were killed back for about 6 to 8 inches. 

 The growth since the freeze has been vigorous from both axillary and 

 adventitious buds. One nurseryman reported that this species could 

 be placed but little above the lemon gum as regards frost-resistance. 



Eucalyptus bicolor A. Cunn. Bastard Box 



The bastard box found at Del Rosa was raised from seed sent to this 

 country from South Africa. The temperature of 14 degrees which 

 these trees experienced in the arboretum does not appear to have in- 

 jured them in any way. New growth started in the latter part of Feb- 

 ruary, and from the general appearance of the trees one could not tell 

 that they had been through a period of low temperature. 



One nurseryman reported that the bastard box is a hardy tree in the 

 nursery, although he had not raised any for several years. 



Eucalyptus calophylla R. Br. Fcathcr-veined Gum 



Feather-veined gum is more susceptible to frost than any species of 

 eucalyptus found in southern California. Seven three-year-old trees, 

 grown from Hawaiian seed, were found at Del Rosa. Suckers came 

 from the roots 12 weeks after the freeze, but were puny and weak. 

 Most of them started 6 inches below the ground level. The dead wood 

 was much discolored (black and blue) and emitted a very disagreeable, 

 though rather faint, odor from the cut surface. 



EFFECT OF LOW TEMPERATURES ON NURSERY STOCK 



The following list of nursery stock is made up from reports fur- 

 nished by different nurserymen in the region where the study was 

 made. The temperatures to which the stock was subjected ranged 

 from 14 to 24 degrees. The species are arranged in the order of their 

 apparent frost-hardiness, the most resistant first. 



