EXPERIMENT STATION BULLETINS. 



213 



KASPBEKRY BYTUKUS. 



{Byturus unicolor.) 

 A small reddish-brown beetle that feeds on the buds and flowers of raspberry. 



For the first time, so far as is kuown to the writer, the raspberry 

 byturus has appeared in injurious numbers in our state. No doubt it 

 has been with us before, but has not heretofore been sent in. This 

 tiny creature is about one-eighth of an inch long, reddish-jellow in color 

 and covered with a dense coat of short, yellowish hairs. The beetles 

 feed on the buds of raspberry as well as on the opening flowers. They 

 seem to prefer the stamens, containing the pollen, but also partake of 



FiQ. 11. Raspberry Byturus, greatly enlarged (Original). 



other parts of the buds. In any case, the buds are so injured that if 

 some of them do manage to develop into fruit, the fruit is so disfigured 

 as to be of no value. The larvae are said also to be found inside the 

 fruit of red raspberries. When full grown, the larvae drop to the ground 

 and form little cells in the soil, usually under rubbish or some other 

 material, where they change to pupae and then to adults the following 

 spring, ready to attack the raspberry buds in May. 



REMEDIES. 



The arsenicals suggest themselves at once as proper applications, and 

 of all of them, arsenate of lead seems most likely to be successful, as 

 it can be applied in heavy doses with no danger of injury to the plants, 

 remaining also on the buds longer than anything else. Use it quite 

 strong and apply when the beetles first appear, before the buds are open. 



