INSECTS INJURIOUS TO RASPBERRY AND BLACKBERRY 415 



i 



stance, interwoven with coarse strands of silk, to which particles of 

 earth adhere. The larva then hibernates until the next spring, 

 when it transforms to the pupa and in a few days the adult ap- 

 pears, usually early in May. 



Control. By suddenly jarring or shaking the bushes the 

 larvae will be shaken to the soil. On light soils this habit may 



FIG. 349. The raspberry saw-fly (Monophadnus rubi Hair.): a, male; 6, 

 female; c, egg blisters on leaf; d, larva; e, cocoons all much enlarged. 

 (After Lowe.) 



be utilized for their destruction by jarring them to the ground 

 and following with cultivators so as to bury the larvae in the 

 loose soil. This will be particularly applicable in hot weather, 

 if the soil is hot and dusty, when most of the larvae will be killed 

 before regaining the plants. By frequent cultivation in late 

 summer or fall the cocoons might be brought to the surface and 

 some of the larvae might be thus killed during the winter, though 



