EXPERIMENT STATION BULLETINS. 



321 



Fig. 35.— Red Necked Agrilas: 

 b, larva; c, imago. 



RED-NECKED AGEILUS (Agrilm ruficollis Fabr.) 



In pruning the raspberry- 

 canes, one will often ob- 

 serve a swelling of the cane 

 for an inch or two. The 

 swelling is apt to be cracked 

 and roughened, manifesting 

 an unhealthy growth. This 

 gall has been termed the 

 raspberry gouty gall. It is ' 

 produced by a small white 

 grub that works in the cane 

 under the bark. The borer 

 matures in early spring, transforms to a pupa in the pith 

 of the cane, and in June comes forth as a beetle to deposit 

 eggs on other canes for a following generation that will 

 mature the next year. The beetles work more extensively 

 on wild than cultivated raspberries. 



Remedy. — Cut out and burn the galls before June. 



THE RASPBERRY SAW-FLY {Monophudnus rubH Harr.). 



For the past year or two, reports have come to us of 

 this saw-fly stripping whole patches of bushes often of 

 several acres in extent. Every year a few are seen on the 

 college patches, but no harm has been done. They 

 are a green, hairy slug working on the under side of the leaf and resem- 

 bling it so closely that one must look carefully to detect them. They cut 

 irregular holes in the leaf, often nearly perforating it, but when nearly 

 grown and now measuring over half an inch in length, they may often be 

 found feeding on the edge of the leaf. There is but one brood each year, 

 BO by the end of June the larvae leave the bushes and enter the ground 

 where they transform and appear as a four- winged fly the following 

 spring to again lay eggs for another brood. 



Remedy. — Spray with hellebore or the arsenites, striking the under side 

 of the leaves as much as possible. 



DISEASES OF THE GOOSEBERRY. 



THE POWDERY MILDEW {Sphcerotheca Mars-uvo', [Schw.J B. and U.) 



Although the European varieties are particularly subject to this disease, 

 it frequently appears upon those of American origin. While they grow 

 luxuriantly in England and in many parts of continental Europe, the cool, 

 moist climate being particularly favorable for them, the European goose- 

 berries suffer a serious check in our hot, dry summers and are quite likely 

 to be attacked by powdery mildew, which, as previously stated, like all 

 others of its class, luxuriates in a warm, dry atmosphere. 



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