CUKRANT CLEARWING MOTH. 67 



was gradually formed, and the bushes may be obtained from 

 various sources. The fact that ours are all planted in such 

 lines may have been partially the means of preventing the 

 more general extension of the 'mite,' which is at present 

 mainly confined to the one plot of Baldwins, though instances 

 are observable in other plots, but scattered. Certainly it 

 should be practised wherever it can be done conveniently, as 

 bushes and trees of all kinds in single lines alternating with 

 others ripen both wood and fruit jbetter than when crowded 

 into dense plantations." — (L. C.) 



There are of course points difficult to be met on the scale 

 of wholesale fruit-growing in the case of strip cultivation, but 

 the cost would be less than the outlay for treatment (at 

 present) almost unremunerative. 



Other points occur as possibly serviceable, such as grafting 

 Black Currant on species not liable to attack, and also ex- 

 perimenting as to whether varieties of Black Currant, which 

 in special circumstances have been found not to be liable to 

 the Phjitoptus attack, will continue clean when in Phytoptus- 

 infested surroundings. 



These and other points of carefully considered treatment 

 are being now carried on, under the direction of Mr. Spencer 

 Pickering, F.Pi.S. (Director), at the Woburn Experimental 

 Fruit Farm, Piidgmont, Aspley Guise, Bedfordshire ; and 

 amongst them are included experimental sprayings with 

 various chemical applications in carefully detailed proportions, 

 the successive treatment being followed at specified intervals 

 by microscopic examination by a skilled investigator of the 

 contents of the sprayed buds, and of others unsprayed but 

 otherwise in similar circumstances. 



By kind permission of Mr. Pickering, I have been permitted 

 to insert an account of the experiments now in progress in 

 the Appendix to my Twenty-first Report, to which the reader 

 is referred for the details from which this paper is abridged. 



Currant Clearwing Moth. Sesia tlpuliformis, Liun. 



The attacks of the caterpillars of the Currant Clearwing 

 Moth (often known as Currant-borers) have long been known 

 as present, both in this country and on the Continent of 

 Europe, and sometimes as doing much mischief by eating 

 their way so as to form a tunnel of several inches in length up 

 the centre of the shoots attacked. They are also amongst 

 the species of injurious insects which have been carried to 

 America, and which have established themselves there. 



f2 



