287 



puncturing the rind of the fruit in order to extract the juice. The 

 wound thus made is very small and quickly heals, but the m]ury is 

 soon followed bv the development of a fungus that destroys the 

 flesh of the fruit. It is possible that the fungus simply enters 

 through the puncture or, more probably, that the insect inoculates 

 it when puncturing the fruit. 



NouGARET (A.). Essais de Destruction de la Cochylis et de I'Eud^mis. 



[Experiments in the Destruction of Clysia ambigiiella and 

 Polychrosis botyana.]—Pr ogres Agric. & Viiic, Montpellier, Ixxv, 

 no. 13, 27th March 1921, pp. 304-309. 

 A report is given of the remedial measures employed against Clysia 

 ambiguella and Polvchrosis hotrana at Lignan. The biology of these 

 moths is described. The treatments included decortication by 

 mechanical means and also by means of chemicals, such as iron 

 sulphate placed in the forks of branches. The usual msecticidal 

 sprays and dusts are recommended ; of proprietary liquids those 

 known as Dynamic and Vitarsine are advocated, the former having 

 carbon bisulphide as its basis and the latter arsenic. They may be 

 apphed in winter, or in spring and summer if the grapes are well wetted 

 first The experiments confirm former observations and experiments 

 that have been noticed in this Review. As a result of these treatments 

 a normal crop was gathered in 1920 from the treated vineyard, though 

 that of the previous year was almost a total loss. 



OuANjER (— ). Considerations nouvelles sur les Maladies de la Pomme 



" de Tevve.—Bull. Soc. Path. Veg. France, Paris, vii, no. 4, 1920, 

 pp. 102-118. [Received 12th April 1921.] 



The diseases of the potato are reviewed, including mosaic disease 

 and the methods by which it is disseminated. Working on the dis- 

 covery of Laveran in Algeria, that insects are capable of transmitting 

 this disease, it has been found that it is in plants derived from stock 

 that has been infested with Aphids that the disease almost inevitably 

 occurs. It is proposed to find a resistant stock suitable for propagation 

 in France, which wih be reared through several generations m order 

 to ensure against re-infection. Aphids or other insects seldom re-mfest 

 plants so cultivated. As Aphids are more abundant in hot regions, 

 varieties of potatoes grown in northern districts will probably prove 

 less susceptible. 



Morse (A P.). Manual of the Orthoptera of New England, including 

 the Locusts, Grasshoppers, Crickets, and their Allies.— Proc. 



Boston Soc. Nat. Hist., xxxv, no. 6, April 1920, pp. 197-DDb, 

 99 figs., 20 pis. 



This book is a complete manual to the study of the Orthoptera of 

 New England based partly on the literature, but mainly on the very 

 extensive personal investigations of the author. , • r r 



The general introduction includes information on the chief literature 

 of the subject ; outlines of classification and morphology ; injuries 

 by locusts and other Orthoptera in New England ; remedies for then- 

 control, only the usual formulae being given ; natural enemies ; and 

 methods of collecting and preserving Orthoptera. 



