THE MONTHLY BULLETIN. 



181 



to have the rhizomorph detached from the root, either intentionally 

 or innocenth^, and it is my belief that a tree in this condition may carry 

 the fungus and that it will be absolutely impossible to detect it by 

 inspection. 



BALLED TREES. 



A custom has grown up with regard to certain trees, especially 

 citrus, of sending the trees with a ball of dirt. This manner of 

 handling trees appears to meet with very general approval, by both 



Fig. 31. — Citru.s roots being attacked by the black strands or rhizomorphs of 

 Armillaria mellea. If the affected roots are cut open the bark will be found to be 

 rotten and filled with white felty fungus. (Photo by California Agrcl. Exp. Station.) 



nurserymen and growers. It is perfectly evident that when a balled 

 tree is taken from an Armillaria spot there is only the slightest chance 

 of rejecting a tree which may be infected. Trees from Armillaria 

 spots, if permitted at all, should not be moved with the ball. 



