REPORT OP THE EJNTOMOLOGIST 103 



Lincoln during 1909, completely stripping the leaves from many fine trees 

 and greating injuring others. This species will be found discussed on 

 a subsequent page and is a close relative of the yellow-necked caterpillar 

 (Datana ministra), a species which was also injurious during 1909 upon 

 apple and haw trees in the state. In early July 1908 the Trees of 

 Heaven (Ailauthus) upon the campus of the University Farm were 

 distinctly injured by the larvae of Atteva aurea. 



The elm scale (Chionaspis americana) proved severely injurious in 

 Purnas county in the vicinity of Beaver City and in Colfax county in the 

 vicinity of Schuyler. In the first mentioned locality the trees were 

 badly infested and some killed during both years. There were also in- 

 juries during 1909 in Adams county. The elm-borer (Saperda tridentata) 

 was another pest of this tree which was quite prominent in various towns 

 in the state. Injuries were reported from Lincoln, Geneva, McCook and 

 Crawford. During September of both 1908 and 1909 many elm branches 

 were cut off from the trees on the Normal campus at Peru, due to the 

 activity of a twig girdler (Oncideres sp.). The wooly elm aphis 

 (Schizoneura americana) was abundant and injurious as during pre- 

 ceding years; an example of its work is shown on Plates 10 to 11. 



The year 1908 from latter April until latter .June was marked by an 

 excessive abundance of the boxelder aphis (Cliiatopliorous uegundiois). 

 The reports of damage came from Webster, Nuckolls, Gage, Dodge, 

 Antelope, Holt, Cherry, Sheridan, Custer, Dawson, Sherman, Howard, 

 Greeley and Wheeler counties, thus embracing most of the central portion 

 of the state. The injury in most localities was very severe, the trees 

 swarming with the small aphids and being largely or entirely defoliated, 

 some of the trees dying from the injury. Over mose of this area the 

 trees had been similary attacked the previous year and to a lesser ex- 

 tent during 1906 also. The abundance of the insects caused the issuance 

 of Circular No. 1 of the office of State Entomologist which discussed its 

 habits and means of control quite fully. During 1909 there was no trouble 

 with this insect anywhere in the state. During May of 1908 there was 

 also some damage IJy the cottony maple scale (Pulvinaria innumerabilis) 

 in Lancaster, Thayer and Franklin counties on maple, boxelder and hack- 

 berry trees, bu the damage was neither severe nor extensive and com- 

 pletely disappeared during 1909. This insect will be fully discussed in 

 the Horticultural report of 1906. 



The Cottonwood leaf-beetle (Lina scripta) was unusually severe in 

 its attacks upon Carolina poplar and to a lessor extent upon cottonwood 

 in several sections of the state during July and early August of both 

 seasons covered by this report. More will be said concerning this 

 species on a following page. The willow leaf-beetle Lina lapponica) 

 woirked with the preceding species and in some localities was quite 

 destructive. During 1909 there were reports of injury to Carolina 

 poplar and cottonwood by an undetermined species of borer, this insect 

 in some cases causing the death of the trees. The willow scale was 

 reported as working injuriously on poplar during middle June 1909. The 



