DISEASES AND INSECTS. 227 



allowed to extend themselves moderately, but little 

 need be apprehended from the rot. 



Dr. Asa Fitch has found upward of thirty different 

 insects which prey upon the grape vine, but with the 

 exception of the red spider, and occasionally the rose- 

 bug, they do not injure the vine materially. 



The red spider (acarus tellarius) of which we give 

 a cut (Fig. 60), we have found, not only under glass, 



Fig. 60. 



but on vines in the open air. It is a small, reddish- 

 colored insect which it requires a sharp eye to detect. 

 For this, as for mildew, sulphur is a specific, and we 

 are always safe in giving our vines a good dusting of 

 this substance, so as to prevent any injury which 

 might arise from either source. 



The rose-bug has never troubled us much. It 

 nearly destroyed Dr. Underbill's vineyards at one 

 time, however, and we therefore give his account of 

 the matter in his own words. 



" Several years since, when my vineyards were 



