1899] PEAR AND CHEKRY SAWFLY. 101 



down, that not ten per cent, of the larvfe were ahve (so far as examined) 

 in their cocoons ; and where a double quantity of nitrate was apphed, 

 a still lesser proportion of the maggots were found to be alive. 



Muriate of potash in about the same quantities showed results of 

 respectively nearly one-half or three-quarters of the maggots dead in 

 their cocoons. 



I am not aware of the action of lime having been tried, but the 

 experiments are given in minute detail in the Bulletin referred to 

 at p. 94. 



In our own (preceding) horticultural reports of experiments, it will 

 be noticed that various kinds of Pears are named as subject or not 

 subject to attack, which may prove to be serviceable information ; and 

 I offer my best thanks to my contributors for their kind courtesy in 

 allowing me to give my readers the benefit of their skilled practical 

 observations. 



Pear and Cherry Sawfly. Sehmdria atra, Stephens and Westwood; 

 Eriocavipa limacina, Cameron ; Eriocavipoides Umacina, Retzius. 



Selandria ATRA. — A, " Slugwonii " of Sawfly; b, cocoon — both much magnified; 

 Sawfly, with lines showing natural size. 



The infestation of the Pear and Cherry Sawfly, figured above, has 

 been known for more than a hundred and fifty years as injurious to 

 leafage of various kinds, and especially to that of Pear, Cherry, and 

 some other kind of fruit trees by means of its small, slimy, Slug-like, 

 blackish, or bottle-green caterpillars feeding on the upper sides of the 

 leaves until, in cases of severe attack, nothing is left but a network 

 of veins held together by the skin of the under surface of the leaf. 



In some years, as in 1896, the infestation has been widespread, 

 and caused a great deal of damage ; but, so far as reported, it never 

 reaches the height, in this country, of being one of our great fruit pests, 

 and with moderate care (since its life-history has been known) it can be 

 kept well in check. In the United States the attack is much more 

 injurious, both by the virulence of the attack itself, and also by the 

 abundance frequently occurring of presence of the second brood. The 

 identical nature of the American with the European infestation has 



