64 



NEW YORK STATE MUSEUM 



Fifth stage. Length 4 mm. This differs from the preceding in 

 the dorsum of the head, the lateral portions of the thorax and the 

 wing covers being a dark brown, the median area whitish green. 

 The dorsum of the abdomen is somewhat darker, with the transverse 

 rows of irregular, circular spots more distinct and pale green. Colora- 

 tion of the antennae and legs practically as in the preceding stage. 



Observations by Mr Strickland on May 27th showed a general 

 infestation, counts of groups of check vines resulting in finding 22, 

 6 and 27 bugs on 7, 6 and 8 vines, respectively. The young bugs 

 were then working in the tips of the shoots, the latter being about 

 6 inches long. The vines were sprayed with black leaf 40, three- 

 fourths of a pint to 100 gallons of water, to which were added 5 

 pounds of laundry soap and 6 pounds of arsenate of lead. The 

 application was made to two rows of 99 vines, the infestation of the 

 checks bemg given above. The following day 12 bugs were found 

 on 7 vines in one of the rows, 1 1 bugs on 6 vines in the second row, 

 and 9 bugs on 8 vines in another vineyard, which had been sprayed 

 with this formula, the original infestation being 55 and 32 bugs to 

 21 vines. The spraying resulted in the destruction of over 58 per 

 cent of the pests. There was a general migration of the young bugs 

 from the tips at about the time the cluster sheaths had broken on 

 June ist, and another spraying was given at this time with the 

 above-designated materials, with the result that no bugs were found 

 on a continuous series of 6 vines in one row, and only 5 on a similar 

 series in another, the infestation in the latter case being confined to 

 two vines. 



Tabulation of results of spraying for cluster infestation 



ROW 



2 



3 



5 



Vine I 



2 





 

 

 





 

 

 





 



■x 



I 



A. 













The vines, it will be seen from the table given above, were practi- 

 cally free from the pests after this last spraying. On June 17th 

 many of the berries were observed dropping from the clusters, which 

 were uneven as in the preceding year. Mr Strickland finally con- 

 cluded that this dropping of the immature grapes may have been 



