200 



extreme cases. In cases of slight infestation, the removal of trees and' 

 the fumigating system are used. An extensive campaign is being 

 carried out against this pest which is well-established over about three- 

 quarters of the State. 



Allen (H. W.). Notes on the Relation of Insects to the Spread of 

 the Wilt Disease. — Jl. Econ. Entom., Concord, ix, no. 1, February 

 1916, pp. 233-235. 



Preliminary experiments on the carriage of polyhedra of wilt disease 

 by insects were performed during 1915 at Lunenburg, Mass. The 

 following insects were collected while feeding on, or in contact with, 

 larvae and pupae of the gipsy moth [Lymantrm dispar] which had died 

 of wilt : — Sarcophagid flies, Calosoma sycophanta, adult Elaterids and 

 Coccinellids, an unknown Hemipteron, and red mites. Sarcophagid 

 flies were especially abundant, and they and the other insects mentioned 

 were found to carry polyhedra on the feet and mouth-parts. This 

 suggests that insects found in association with the disease, and which 

 carry polyhedra after contact with it, may assist in spreading the 

 infection. 



CocKERELL (T. D. A.). Two New Monophlebine Coccidae from the 

 Philippine Islands. — Jl. Econ. Entom., Concord, ix, no. 1, 

 February 1916, pp. 235-236. 



The new species described are : — Llaveia benguetensis and Drosoicha 

 palavanica. 



Grassi(B.). D1 una malattia infettiva della Diaspis pentagona, TsLVg. 

 [On an infectious disease of Aulacaspis pentagona, Targ.] — • 

 Separate from Boll. Informazioni Seriche, ii, no. 19, 1915, 6 pp. 



In order to determine precisely the efficiency of Prospaltella berlesei 

 in controlling Aulacaspis pentagona it is necessary to distinguish its 

 action from that of an infectious epidemic disease which attacks the 

 scale very actively and is far more destructive than Prospaltella [see 

 this Review, Ser. A, iv, p. 15]. Cases are instanced where 60 per cent, 

 of the Coccids were killed by the infection. The infected adult scales 

 are less markedly red than those parasitised by the Hymenopteron, 

 and are swollen and soft, as if filled with liquid ; they never contain 

 eggs. Individuals killed by the disease are very dark in colour, hke 

 those which have died a natural death, but differ from them in being 

 longer than wide and flattened out. At present nothing can be said 

 as to the possibility of artificially transmitting this infection. In 

 combating A. pentagona, P. berlesei is certainly slower than Novius 

 cardinalis against Icerya purchasi, but it is assisted by this disease. 

 While the diffusion of Prospaltella should be furthered, efforts should 

 also be made to develop the disease in locahties where it does not 

 manifest itself spontaneously, while other enemies, especially predaceous 

 Coccinellids such as C. bipustulatus and Rhyzobius lophantae, should 

 be given all possible assistance. 



