PESTALOZZIA 451 



little and are thinner than the healthy part of the leaf. The 

 disease is said to start, as a rule, on one side of the bush, and 

 usually on the same side on all the bushes of an affected plot, 

 which suggests the conveyance of spores by wind from some 

 other infected region. 



The fungus is also parasitic on species of Camellia and 

 Rhododendron\\\ India, also in Europe. In the United States 

 it is present on introduced species of Camellia and Citrus, 

 from whence it probably passed on to the native species of 

 Magnolia. It also occurs on indigenous plants, Niphobolus, 

 in New Zealand, and on Alphitonia in Queensland. 



Pustules minute, dot-like, on bleached spots ; conidia 

 elliptical, ends narrowed, 3-4-septate, end cells hyaline, 

 central ones coloured, apical cell with 3-4 very slender, 

 hyaline hairs. 



If diseased leaves were collected and burned, the disease 

 could be stamped out ; the work, however, should be general, 

 and not confined to certain plantations only, as the evidence 

 at hand strongly suggests that the spores are carried by wind, 

 birds, etc., from one place to another. Care should be taken 

 also that the fungus is riot allowed to flourish undisturbed in 

 wild plants adjoining tea plantations. 



Massee, Kew Bulletin, 1898, p. 506. 



Watt, The Pests and Blights of the Tea Plant. 



Conifer seedling disease. Seedlings of spruce and silver 

 fir are frequently destroyed in large numbers by Pestalozzia 

 hartigii (Tubeuf). In summer young plants lose their 

 colour and die. On examination, the cortex just above the 

 ground is found to be killed, and closer search reveals the 

 presence of numerous minute clusters of fungus mycelium or 

 stromata bearing the conidia of the fungus. 



Pustules immersed, globose, springing from a flattened 

 stroma ; conidia emerging in black masses, at first hyaline, 

 continuous, then 3-septate, ovate-oblong, the two central cells 

 large, coloured, terminal cell small, hyaline, 18-20 //. long, 

 setae 1-4 at apex of conidium. 



Remove and burn diseased seedlings. 



Hartig and Somerville, Diseases of Trees, p. 136. 



Pestalozzia lupini (Sor.) is recorded as a pest attacking the 

 cotyledons of cultivated species of Lupinus. 



