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small, and after about a month at one of these molts the 

 adult insect is produced. Egg laying for another brood now 

 follows, and the eggs hatch in eight or ten days, because of 

 the warmer weather which has now arrived. About a month 

 later the adults of this brood appear, and we may have as 

 many as four broods in Massachusetts before winter puts 

 a stop to this process. 



The effect of the feeding of these little pests upon the 

 trees is to a large degree dependent upon their abundance. 

 In general, trees attacked fail to make much new growth, 

 but remain at a standstill. The quantity of fruit produced 

 and its size are also determined to some extent in this way, 

 while in severe cases the leaves turn yellow, the fruit drops 

 from the trees when partly grown, and many of the buds 

 die. In one case, where a pear orchard in the spring prom- 

 ised a yield of about twelve hundred barrels, the actual yield 

 was less than a hundred. 



[Numerous methods for the control of this insect have been 

 tested, but only one has given satisfaction, and this is kero- 

 sene emulsion. About the 15th or 20th of May, or as soon as 

 the leaves are well expanded and the young have begun their 

 work, one part of kerosene emulsion diluted with twenty-five 

 parts of water, applied with a nozzle which will give a fine 

 mist, has proved very effective against all the young psyllas 

 it reaches ; and when a thorough application has been made 

 at this time, the later broods are so small that they may 

 safely be neglected. Where this treatment can be given soon 

 after a heavy rain, the results are better than is otherwise 

 the case, the rain washing off much of the honey dew, which, 

 when it is abundant, somewhat interferes with the best re- 

 sults of spraying in this way. 



Peach Bokek. 

 Every one who has attempted to raise peaches has had an 

 unpleasant experience with the peach borer (Sanninoidea 

 exitiosa Say) ; but few are aware that the adult of this borer 

 is a pretty moth so closely resembling a wasp that De Geer 

 wrote of it nearlv a centurv and a half aijo: "When I saw 



