258 MONTANA EXPERIMENT STATION. 



a berry to turn red prematurely; in severe cases causing the entire 

 crop to fall to the ground. 



Remedy. — Either gather the fallen fruit frequently and destroy 

 it, or, after all of the insects have dropped to the ground, turn with 

 a plow a deep furrow of earth against the row, then with a rake or 

 shovel smooth the earth down around the bushes so as to cover up 

 the hibernating insects so deeply that they cannot escape. This 

 should be done in the fall or early spring. 



37, The Currant Stem Borer. 



Larvae of a clear-winged moth, a near relative of the peach 

 borer, which makes burrows in the currant canes, sometimes becom- 

 ing very injurious. 



Remedy. — Watch the currant bushes in the early part of the 

 summer about the time the fruit is setting and cut out and burn 

 affected canes which may be detected by the yellowish color or 

 wilted condition of the foliage. 



38, Currant Leaf-hopper. 



Minute whitish insects on the under side of foliage of currant 

 in the early part of the season. Later they acquire wings and have 

 pinkish markings. 



Remedy. — Spray the under side of the foliage with kerosene 

 emulsion, one part ni nine of water in the early part of the season. 



39, The Currant Aphis. 



Green lice on the under side of currant leaves, causing the leaves 

 to turn reddish in color and to have an irregular surface. 



■Remedy. — Spray with kerosene emulsion or whale-oil soap solu- 

 tion. This spray kills only by coming in contact with the lice, there- 

 fore direct it against the under side of the leaves. 



40, Currant Thrips. 



Minute reddish insects of elongated form which cluster on 

 the tender buds and blight them. " 



Remedy. — Pick off and destroy the affected parts. 

 41, Currant Cottony Scale. 



Cottony masses on the canes of currant and gooseberry. 



Remedy. — Spray with whale-oil soap solution, i pound in 4 

 gallons of water during the winter. In gardens where it is possible 

 wash off the cottony masses with a strong stream of water. 



