164 FUNGOID PESTS OF CULTIVATED PLANTS. 



black, without forming definite spots, with long straight conidia, rounded 

 at the ends (14-18 x 4-6 /*). 



Yet another occurs on Orange as well as on H oya leaves (Gloeosporium 

 macropus) without forming any definite spots, the long conidia (18-21 

 x4-6/x) produced on very long basidia (48-60 /x long). Any of these 

 may be found in our conservatories at any time. 



The Olive is not sufficiently cultivated in this country to render its 

 parasites of much interest. 



FIG MOULD. 

 Botrytis cinerea (Pers.), fig. 10. 



This mould, long regarded as a saprophyte, has been found destructive 

 to ripe Figs, covering them with a dense felted mass of grey hyphae, and 

 bearing a profusion of oval conidia. It appears to be the same species as 

 causes the Lily disease. For other Fig parasites see " Pests of Orchard 

 and Fruit Garden," p. 137. 



Journ. R.H.S. xxviii. p. xxxix and p. 29. 



A black mould, Cercospora Bolleana (TLiim.), has occurred on Fig 

 leaves, and is believed to have appeared recently in Britain. 



CAMELLIA BLOTCH. 

 Pestalozzia Guepini (Desm.), PI. XIV. fig. 17. 



This disease is far from uncommon on the leaves of Camellia under 

 cultivation, and is so widely extended that it attacks the Tea plants in the 

 Tea gardens of India. 



It causes unsightly large blotches on the living leaves, which are 

 mostly of a rounded form, but sometimes irregular through confluence of 

 the blotches. They are bleached and of a silvery-white colour on the 

 upper surface, with a strongly defined outline, and sprinkled with the 

 black dots which indicate the pustules. There are no true perithecia, 

 the sporules being produced in small cavities in the substance of the leaf, 

 the surrounding cells modified and discoloured so as to form a false 

 receptacle. 



The sporules are of a remarkable kind, peculiar to the genus. In out- 

 line they are somewhat spindle-shaped, being attenuated towards each end 

 (20 ft long), with three or four transverse divisions, the apical cell colourless 

 and conical, bearing a tuft of three or four long colourless hairs, which 

 form a crest. The bottom cell is also colourless, and attenuated into a 

 long hyaline stem equal in length to that of the sporule. The intermediate 

 cells are coloured brown, and become at length rather opaque. When 

 mature the sporules are discharged through the rupture of the cuticle. 



It is found throughout Europe and in North America, also on leaves 

 of Rhododendron, Orange, Hoy a, Magnolia, Smilax, Lagerstrcemia, and 

 Almond, but typically on Camellia. 



The only check is to collect and burn all diseased leaves. 



Sacc. Syll. iii. 4146 ; Cooke, Hdbk. No. 1401 with fig. 183. 



