GRAPEVINE ROOT WORM 31 



jured, and in a later report he states that renewing a vineyard 

 with Niagara vines seems to be quite a success. This latter point, 

 we think, needs further demonstration. On the other hand it 

 will be observed that Mr Slade considers that the Wordens and 

 Catawbas suffer more than the Concords. The relative liability 

 of different varieties to injury is probably influenced to a con- 

 siderable extent by location and character of the soil, specially 

 the latter, and it is therefore not surprising to meet with some 

 discrepancies as to the relative amount of injury they suffer. 

 Extended observations and probably careful experiments are 

 necessary before authoritative conclusions can be reached. 



GRAPEBERRT MOTH 



(Polychrosis botrana Schiff.) 

 This species is present in more or less numbers in most vine- 

 yards, and as it was met with in the course of our experimen- 

 tal work on Fidia, and since this latter gave some valuable 

 results on methods of controlling this fruit pest, a brief notice 

 of it is included. This species is specially destructive in the 

 vicinity of forests or in vineyards near which bushes of various 

 kinds, particularly sumac, are allowed to grow. It is believed to 

 have two generations in this country, the larvae of the first feed- 

 ing on the blossoms and those of the second in the fruit. There is 

 possibly a third brood. It is gratifying to state that we have 

 obtained excellent results in controlling this pest with arsenate 

 of lead and also the poisoned Bordeaux mixture. The spraying, 

 done shortty after blossoming and while the fruit was not larger 

 than a small pea, was primarily for the purpose of killing Fidias; 

 but investigation this fall shows that it was much more effective 

 in destroying young of the grapeberry moth, since there is cer- 

 tainly 50f{ less damage to fruit on sprayed than on unsprayed 

 rows, even when the two are side by side. The difference was so 

 marked that it was easily observed, and in walking between the 

 treated and untreated areas, it was not hard to find infested 

 clusters on the one side while on the other they were much less 

 abundant. It was also observed that not only was this insect 

 checked by spraying but the foliage was benefited by the treat- 

 ment, having a better color and remaining on the vines a longer 

 time. 



Our experiments were in Mr D. K. Falvay's vineyard, and he 

 informs us that last year a section of six or seven rows in his 



