62 PEAR. [1900 



tender young leaves were all still rolled up — after application of the 

 emulsion the new leaves, up to date of observation, continued healthy. 



In the report of Dr. J. Fletcher, Entomologist of the Department 

 of Agriculture, Canada," giving some good information on tlie life- 

 history of this Pear-leaf attack and practicable remedial measures, it is 

 stated that, "as a remedy, kerosine emulsion seems to be the only 

 substance which, up to the present time, has given any promising 

 results." 



From the results of the elaborate experiments carried on at Cornell 

 University Experiment Station, detailed by Mr. Slingerland in the 

 Bulletin mentioned below, I it is considered that " the most vulnerable 

 point at which the disease can be attacked on a large scale is when 

 the mite is in its winter quarters in the terminal winter buds " ; and 

 trial of effect of kerosine emulsion proved very satisfactory. 



From the summary given of results, it appears that the Pear Leaf- 

 blister Mite can be nearly exterminated by o)ie spraying of the Pear 

 trees (at any time after the leaves have fallen off in autumn, and before 

 the buds have begun to swell in the spring) with kerosine emulsion 

 diluted with not more than five to seven parts of water ; the tree being 

 sprayed thoroughly from every side, taking especial care to hit every 

 terminal bud, as this is where the mites are stated to congregate. 



Where those concerned have the knack of mixing the mineral oil 

 and solution of soft-soap, of which kerosine emulsion is composed, so 

 thoroughly together that they will not separate again and distribute 

 themselves in their previous un-incorporated condition, this application 

 is obviously a very desirable remedy. But the thorough incorporation 

 of the ingredients is hard to manage, and separation is liable to cause 

 much mischief. 



Very possibly any mixture of soft-soap with a little paraffin stirred 

 into it would do good, and almost certainly the mixture sold as ''Anti- 

 pest " by Messrs. Morris, Little & Son, of Doncaster, would answer 

 excellently. This is similar in all essentials to the kerosine emulsion 

 of the U.S.A., but, being sold in a mixed state, only needing diluting, 

 much risk and time are saved by its use. 



Where circumstances allow of the infested leaves being picked off 

 and destroyed, it is very desirable that this should be done. 



The above notes contain the main points requiring observation and 

 attention in order to keep this attack in check, but given shortly to 

 avoid unnecessary repetition. They will be found in detail in my 

 Seventeenth and Eighteenth Annual Pveports before alluded to. 



• See " Keport of the Ontario Fruit-growers Association," p. 113; published 

 in the ' Annual Report of the Department of Agriculture of Ontario for 18;»2.' 



t Bulletin Gl, Dec. 1893 Cornell University Agricultural Experiment Station. 

 By Mark Vernon SUngerland. Published by the University, Ithaca. New York. U.S.A. 



