386 The Yellow-horned or Plum Fruit Sawfly. [aug., 



it, and it may be on the surrounding tissue (Fig. a). In a 

 month and over the larva is full grown, f -inch in length, and 

 falls to the ground in the spoilt fruitlet; it leaves the plum 

 by means of a round hole (see Figs, a and b), and passes into 

 the soil to make the cocoon, under cover of which the winter 

 is passed. The cocoon is made in June and July. A larva 

 with me made its cocoon on June 13th in soil offered to it, 

 while, on the other hand, I had larvae still in the plums on 

 July 2nd. 



Plums Attacked by the>- Plum Fruit Sawfly. 



In the spring of the next year pupation takes place, and the 

 adults appear in due course. 



Remedial Measures. — (1) In the Continental literature it 

 is suggested that the trees should be sprayed just before 

 the opening of the flower-buds with a liquid which will be 

 distasteful to the sawfly and will prevent egg-laying. Some 

 such sprays are named, but no record is given as to the value 

 of this mode of treatment. 



(2) Collect and burn the infested fruits before they fall, so 

 as to prevent a new brood of sawflies. Infested fruit can be 

 recognised by the hole, blocked, it may be, with adhering 

 excrement or a drop of gum. 



