10 



APPLE. 



Apple Sawfly. Hoplocampa testudinea, Cameron ; Tenthredo testu- 



dhiea, Klug. 



Hoplocampa testudinea. 



Female Sawfly and caterpillar, magnified, with lines showing nat. size, after 

 Prof. J. O. Westwood (see ' Gardeners' Chron.,' vol. for 18i7, p. 852). Caterpillars, 

 nat. size ; and infested Apple. 



In my Report for 1891, I gave observations from various contribu- 

 tors, noticing the serious injury caused by tlie caterpillars of the Apple 

 Sawfly feeding within the growing Apples ; and at the same time I 

 drew attention to the likelihood of this infestation not having received 

 the attention it needed, consequently on the method of attack, and also 

 the appearance of the caterpillars, bearing a general resemblance to 

 those of the Codlin Moth. The infestation was described by Prof. J. 

 0. Westwood from his own observations, so far back as 1847, but since 

 then (so far as I am aware) has not been specially brought forward in 

 this country until last year. 



Then, with the help of the observers whose names are given with 

 their notes in Report mentioned above, we traced out the attack, 

 almost completely, through its various stages, as a very definite orchard 

 pest, but we were not able to complete the observations by identification 

 of the caterpillars as those of the Hoplocavipa testudinea, by reason of 

 the proper time not having arrived for the emergence of the Sawfly 

 from its cocoons. 



During the past season this point has been added. The Sawflies, 

 which developed in May from the cocoons formed by the caterpillars 

 of which observations had been taken, show the infestation to be (as 

 we then supposed) that of the species formerly known as the Tenthredo 

 testudinea, Klug, now more precisely defined as the Hoplocampa testu- 

 dinea. Other points, both of life-history, and also bearing on practi- 

 cable measures of prevention of attack (including the possibility of 

 removal of cocoons from the surface soil beneath the infested trees 



