32 Journal of Agriculture, Victoria. [10 Jan., 1919. 



insects are allowed to operate undisturbed, the bark cracks at tbe end 

 of the period of growth. 



The Jonathan is one of the varieties most liable to be attacked in 

 this manner, and Figs. 1 and 2, sections of young laterals, in Plate 184, 

 depict this condition. Further neglect during the second year induces 

 the development of abnormal woody excrescences by encouraging 

 unnatural and excessive sap movement in the affected parts.^ Fig. 3 is 

 a two-year-old Jonathan lateral, and the longitudinal section of bark 

 and wood was cut away at (a) to show the development of the protuber- 

 ance, and thus depict this condition of the specimen. 



Plate 184. — Jonathan laterals infested with woolly apMs. 



The bark on the irregularly shapen swellings being incapable of 

 maturing while the insects are present offers them a favorable feeding 

 ground, and if this condition be allowed to continue for a number of 

 years, the branches assume the appearance of the section of the Reinette 

 de Canada tree, which appears in Plate 185. The deep crevices in the 

 warts afford shelter for many of the insects, and the work of destroying 

 these by spraying is rendered difficult. 



