The Raspberry Saw-Fly 245 



of strawberries, blackberries, and the like. The eggs are laid inside 

 of unopened buds in which plenty of pollen will be found for the 

 young larvae to feed upon. After laying the egg the female crawls 

 down the stem of the bud and girdles it so that it either falls at once 

 or after hanging by a few shreds for a short tune. The larvae de- 

 velop upon the pollen and inner parts of this fallen bud, then pupate 

 within it. The beetles feed for a short time after emerging upon 

 pollen, especially that of wild bergamot, then go into winter quarters 

 in midsummer, there being but one generation a year. 



Control. Fortunately, the work of this insect comes in cycles, be- 

 ing serious for two or three years then disappearing. Little seems 

 to be known in regard to definite means of control. With straw- 

 berries, planting largely imperfect varieties which are less subject to 

 attack, by reason of not supplying pollen for the insect to feed upon, 

 may help. With the blackberry, clean cultivation, to destroy the hi- 

 bernating quarters of the beetles, is perhaps the most feasible means 

 of attack. 

 References. 



Chittenden, Ins. Life, 5:167 and 7:14. 



N. J. Expt. Sta. Bull. 225. 



THE RASPBERRY SAW-FLY 



Monophadnus rubi, Harris 



This insect is a black, thick-bodied, four-winged fly about one- 

 fourth inch in length, the female having a yellowish-white band 

 across the abdomen. The flies appear in May and the eggs are placed 

 between the two layers of the leaf near a vein. The leaf dries at the 

 point where the egg is laid, giving it a spotted appearance. The 

 larvae feed upon the leaf tissues, eating out irregular holes and even 

 all but the larger veins. The full-grown larvae are about three-fourths 

 of an inch long, light green in color and covered with transverse rows 

 of spine-bearing tubercles. When full grown they leave the bush, 

 enter the ground and make for themselves a little oval earthy cocoon 

 mixed with silky and glutinous matter, from which the flies emerge 

 the following spring. 



Control. In well-cultivated fields brushing the larvae from the 

 plants in the middle of the day so that they fall upon the hot 



