59 



year; and the same is true of the green apple aphis (Aphis pomi 

 De G.). which is sometimes so abundant as to kill young trees. Mr. 

 H. E, Mathews, horticultural inspector for Delta County, considers 

 these lice as the most serious pests to fruit in his section, and Mr. 

 Thurston "\ATiite, horticultural inspector for Fremont County, says 

 the black peach aphis (Aphis persicip-niger Sm.) is one of the most 

 serious insect enemies he has to deal with. 



Gooseberries and currants suffered quite severely in the northern 

 ])ortion of the State the past summer from the attacks of the goose- 

 berry fruit-fiy (Epochra canadensis I^oew) and from a fruit-worm 

 closely allied to Z^ophodia grossularice Kiley, but apparently different 

 from that species. 



Aulacaspis rosa^ Bouche was taken for the first time in Colorado 

 last October upon blackberry canes, where it seems to have been 

 fairly (common. 



The cheny scale (Aspidiotus forhesi Johns.) was reported to me 

 by Professor Cockerell, who took examples near Colorado Springs. I 

 believe this scale has not been taken before in Colorado. 



The San Jose scale (Aspidiotus perniciosus Comst.) is still un- 

 known in the State. The scale that gives most promise of being 

 a serious orchard pest is Aspidiotus^ howardi Ckll. It is partial to 

 l)ears and plums and attacks the fruit badly, but does not produce 

 the red discoloration that is so characteristic of perniciosus. 



SHADE-TREE PESTS. 



The cottony maple-scale (Pulvinariainmimerahilis Rathv.) is prob- 

 ably our worst shade-tree pest and is about equally bad each year, 

 but Mr. S. Arthur Johnson has a paper upon this insect, and I will 

 not say more about it. 



The so-called oak borer (Prionoxystus rohinia^ Peck), is a serious 

 enemy to our poplar and cottonwood trees and is especially destructive 

 to Balm of Gilead. A phytoptus mite (Eriophyes popidi Nal.°) 

 greatly disfigures our poplars and cottonwoods hy the production of 

 irregular knot-like swelling upon twigs and smaller limbs, par- 

 ticularly about the buds. 



ENEMIES TO GARDEN VEGETABLES. 



A radish maggot that I have taken to be Anthomyia radieum., but 

 which does not seem to the writer to answer very well to Doctor 

 Eiley's description of this species, has been troublesome in radishes 

 in Colorado for a few years past and seems to be on the increase. 

 There were at least two broods of the flies at Fort Collins the past 



« Deteriiiined by Mr. Nathun Banks, through the courtesy of Dr. L. O. Howard. 



