June, '09] JOURNAL OF ECONOMIC ENTOMOLOGY 211 



terstinctana. has been in clover fields in the vicinity of Ames. A 

 rather uncommon plant louse. Aphis hakeri Cowen, has been extremely 

 common in clover fields around Ames, causing some serious injury. 

 One field near the college was severely attacked by this aphis. In mid- 

 summer the aphids were found on the heads and stems of the plants, 

 but as the weather became colder they moved to the lower parts of i:he 

 stems, where they were found late in the fall, attended by the large 

 black ant, Formica fusca. The aphis was identified for me by Mr. 

 J. J. Davis from specimens found on the stems of clover at Ames. 



A strawberry root worm, Graphops nehulosus Lee, was reported 

 from the eastern part of the state as causing serious injury to straw- 

 berry plants. This is the first time that this species has been noted 

 as being injurious in this stage. 



The woolly aphis. Schizoneura lanigcra, has not been so common in 

 the nurseries of the state as in previous years. It could scarcely be 

 found during the season in nurseries which have had much trouble 

 with this insect. Towards the latter part of July the apple-aphis, 

 Aphis mali, became very numerous on apple stock in nurseries, as 

 well as on young apple trees in orchards. 



The apple leaf hopper, Empoasca mali, continues to be abundant in 

 nurseries generally. In one large nurserv^ at Charles City, in the 

 northern part of the state, the apple stock was again attacked by this 

 little hopper. From some observations made during the summer in 

 various parts of the state, there appears to be five broods of the hop- 

 pers during the season, the young hoppers appearing about once a 

 month, from ]\Iay to September. The lesser apple leaf-folder, Acleris 

 minuta, caused serious injury to apple stock in two large nurseries in 

 the southwestern part of the state. A series of spraying experiments 

 showed that this insect may be successfully controlled by spraying 

 with arsenate of lead, the spraying being done when the insect was still 

 ia the eg^ stage. Spraying after the larva were old enough to fold 

 entire leaves was of no practical value. 



Ghionaspis pinifoliae was noticed to be fairly common among ever- 

 greens in one of the large nurseries in southwestern Iowa, but did no 

 appreciable damage. Black Hills spruce and Scotch pine were the 

 varieties most affected. A much more serious pest, the San Jose scale, 

 made its appearance in Iowa during the past year. This outbreak is 

 treated more fully by Professor Summers in a separate article to 

 be given at this meeting. 



A cherry slug, presumably Eriocampoides limacina, stripped many 

 cherry trees of their leaves in the town of Ames and vicinity. . The 

 second brood of this insect was especially numerous. Early in the 



