278 



FRUIT AND ITS CULTIVATION. 



bushes in search of new buds. It is assumed that some 

 crawl on the ground to other trees, or that they are carried 

 by bees or other insects thereto. Anyhow, the fact re- 

 mains that the infestation quickly spreads to other trees. 

 Now as to remedies. Picking off and burning all swollen 

 buds seems to be the most certain remedy. Where trees 

 are badly infested this plan is hardly practicable, because 



Fig. 129. CURRANT CLEAR-WING MOTH (SESIA TIPULIFORMIS). 



The upper figure is the moth ; the cross lines below indicate its natural size ; 

 at the bottom is a shoot with the larva inside. 



it would mean destroying all, or nearly all, the buds, and 

 the trees would be rendered worthless. Clearly, the best 

 remedy would be to dig up and burn the trees, and not 

 to plant Black Currants again on the same site. Another 

 remedy advised is to dust the bushes in spring and sum- 

 mer, when the foliage is moist with dew or after rain, 

 with a mixture of one part of fresh ground lime and two 

 parts of flowers of sulphur. Some growers claim to have 



