THE CELERY TREE-HOPPER. 



37 



A number of other methods have been used with more or 

 less good results. By attracting the winged insects with a 

 light many can be destroyed; hence a brightly burning torch 

 is slowly carried at night along the rows of vines, which are 

 at the same time disturbed to start the leaf-hoppers. An- 

 other plan is to carry a shield covered with a sticky sub- 

 stance between the vines diiring the hottest part of the day, 

 and thus catch the insects that have been driven off the plants 

 bv beating these lightlv with a stick. 



THE CELERY TREE-HOPPER. 



( Clcadula Ji.-J!neata Forbes). 



During the early part of July a small tree-hopper resemb- 

 ling that found on the grape-vine, but very much larger, was 

 doing considerable damage to the celery 

 plants in the vicinity of the Twin cities. 

 As the injury- did not seem to be very 

 widespread and as the insect is probably 

 to be controlled by the same remedies as. 

 is the grape-vine hopper, it was not 

 thought best to carry on very extensive 

 experiments with it until the success of 

 the experiments on the latterinsect could 

 be determined. Raupenleini was tried as 

 a repellant,but the results were not sat- 

 isfactory. Probably the best remedy is a 

 spray with the tobacco-extract described 

 in the article on the grape-vine tree- 

 hopper; this, while it would injure the 

 sale of the celery if applied late in the 

 season, w^ould probably prove very ef- 

 ffectual earlier and before the plants are 



Enlarged. Original. ^^^ ^^^ advaUCcd. The CUlprit, which is 



a rather handsome insect, is illustrated in fig. 20. It is of 

 a bright green color, marked with a few black spots upon 

 the head, the under-side of which is illustrated to show the 

 sharp and pointed beak which is inserted into the tissue of 

 the plant to abstract the sap. Plants infested by many 



— Celery tree-hop- 



