109 



THE OCCURRENCE OF FUNGI- ON ALEURODES 

 VAPORARIORUM IN BRITAIN. 



By A. S. HORNE, 

 Royal Horticultural Society's Gardens, Wisley. 



In 1902 H. M. Lefroy 1 reported the presence of a fungus on the 

 brown shield scale (Saissetia hemisphaerica) in the West Indies which 

 was subsequently identified as Cephalosporium Lecanii discovered by 

 Zimmermann 2 infesting Lecanium viride (green bug) on the coffee 

 plant in Java (1898). Both Zimmermann, and Parkin 3 who described 

 C. Lecanii in greater detail (1906), ascribe to the fungus a parasitic 

 habit. It was enrolled among the ranks of entomogenous fungi and has 

 been used on a considerable scale to combat scale insects in the West 

 Indies, Florida and elsewhere, and according to J. R. Bovell 4 , 



F. W. South 5 , G. G. Auchinleck 6 (citrus trees in Dominica and Grenada), 



G. E. Bodkin 7 (British Guiana), and W. Nowell 8 (Grenada, Dominica, 

 Antigua) with some success. 



Professor Lefroy in December, 1914, drew my attention to a con- 

 siderable quantity of fungus on the leaves of Centropogon, at Wisley, 

 also badly infested, for experimental purposes, with the nymph-form of 

 Aleurodes vaporariorum (white fly). The upper surface of the leaves 

 was covered with a sooty mould (Capnodiuml): the under surface, 

 infested with a quantity of eggs, nymphs and a few emerging and com- 

 plete imagos, was covered with mycelial tufts of Cladosporium and 

 wefts of Cephalosporium. 



1 H. M. Lefroy in W. I. Bull. hi. (1902), 240, 295. 



2 Zimmermann, Over eene Schimmel epidemic der Groene Luizen. Buitenzorg, Java, 

 1898. 



3 J. Parkin in Ann. Roy. Bot. Gard. Peradeniya, in. Pt. 1 (1906), 41. 

 * J. R. Bovell in W. I. Bull. xn. No. 4 (1912), 399-402. 



5 F. W. South in W. I. Bull. xi. No. 1 (1911), 1-30, and W. I. Bull. xn. No. 2 (1912). 



6 G. G. Auchinleck in W. I. Bull. xn. No. 2 (1912). 



7 G. E. Bodkin in Jour. Bd. Agric. Brit. Guiana, v. No. 2 (Oct. 1911). 



8 W. Nowell in W. I. Bull. xiv. No. 3 (1914), 215. 



