RA.SPBERRIES AND BLACKBEHIIIES. 



28 



plants are destroyed, the disease may generally be kept in check 

 until a new plantation can be well started, and sometimes assidu- 

 ous attention to pulling and burning results in stamping out the 

 disease. 



(3) Anthracuose, or Cane-Rust— Also known as the rasp- 

 berry cane-rust. It manifests itself by weakening the grrfwth and 

 causing the bark of the canes to become marked with many white 

 or grayish, flattened or depressed spots, bordered by a ring of pur- 

 ple; s.ome of these spots may be one-third of an inch in diameter. 

 This disease seldom does serious injury to any but cap varieties of 

 the raspberry, and it is only occasionally noticed to any extent in 

 this state, and then not as being very hurtful. In some of the 

 eastern states it is so abundant as to almost prohibit the growing 

 of cap varieties. 



The treatment for this disease consists in burning all the in- 

 fected canes and in applying Bordeaux mixture to the new growth 

 occasionally during the growing season, commencing early. 



Insects.— The rasberry is seriously injured by but few insects. 

 The most common are the following : 



Raspberry Flat-headed Borer (Agrilus ruficolUs ) Fig. 14. 

 The perfect form of this insect is a beetle which lays its eggs in the 

 growing canes some time during the summer. Where the eggs are 



laid peculiar gall-like 

 swellings may occur 

 {Fig. 15), having many 

 rough slits in them ; but 

 this is not always the 

 case, for sometimes 

 canes may be killed by 

 the insect and no swell- 

 ings at all appear on 

 the canes. The eggs 

 hatch into little yellow- 

 ish-white larvae, having 

 a flattened body, brown 

 jaws, and a tail fur- 

 nished with two dark-brown horns. One swelling may contain 

 many larvse. When full-grown the larva? is from one-half to three- 

 fourths of an inch long, and by burrowing in the wood frequently 

 girdles the canes. The perfect beetles emerge about the time the 

 plants are in full blossom. They have a brilliant copper-colored 

 head and thorax, and the body and hard wings are velvety black. 

 As the insects winter over in the canes they may be destroyed 

 by cutting and burning all the infested wood some time during the 

 winter. 



Snowy Tree Cricket {Oecantfms niveus). Fig. 16. This insect 

 does not feed on the raspberry plant in any way, but it is injurious 

 on account of its peculiar habit of puncturing the canes with lines 

 of little holes in which to deposit eggs. If this work does not kUl 



FIG. \A.— Raspberry Cane-borer. A, larvce,. 

 B, mature insect. C, Horns at extremity 

 of abdomen of larvo&. 



