GRAPE INSECTS 



407 



of June and the middle of July. The grubs are then feeding on 

 the upper surface of the leaves, where they can be easily reached 

 with the spray. The poison can be applied to advantage com- 

 bined with the Bordeaux mixture generally used at that season 

 for the control of fungous diseases. In cases where summer 

 spraying has been neglected and 

 the beetles are present in the 

 spring they may be poisoned by 

 spraying the swelling buds very 

 thoroughly with a strong arsenical 

 mixture, or the beetles may be 

 jarred into pans containing a 

 little kerosene or on to sheets sat- 

 urated with oil. The work of col- 

 lecting the beetles must be done 

 in the warmer part of bright 

 sunny days while the beetles are 

 most active, for in the cold raw 

 weather it is hard to find them. 

 When alarmed the beetles feign 



death and drop at the slightest Fig. 352. — Pupa of the grapo 

 rii_ 1 • xi • • • vine flea-beetle. Enlarged. 



jar. bhakmg the vmes or jarrmg 



the trellis will cause them to fall for some distance along the 

 row. For this reason we have found it most satisfactory to 

 collect the beetles in a small pan containing a little kerosene by 

 tapping the canes, on which they are feeding, lightly with a 

 small stick. As a rule the grape-vine^ flea-beetle is most 

 troublesome in vineyards adjoining woodlots, hedgerows or 

 waste land in which the beetles find suitable^ hibernating shelter. 

 Wherever practicable all such conditions should be eliminated. 



Referencp:s 

 Comstock, Rept.' as U. S. Ent., pp. 213-216. 1880. 

 Corndl Agr. Exp. Sta. Bull. 157. 189S. 

 N. Y. (Geneva) Agr. Exp. Sla. Bull. SM, pj). 194-514. 



1910. 



