176 OHIO EXPERIMENT STATION: BULLETIN 194 



the Experiment Station has tried during: the past two or three years, 

 the one known as Scalecide has given the best results. This ma- 

 terial is a patent so-called soluble oil, in other words an oil emulsi- 

 fied so that when water is added the two combine, resulting- in a 

 milk-white, oily spray. This material is not excessively expensive 

 and serves most excellently the purposes of the householder who 

 has a small area to be treated, and who has not access to the public 

 sprayer or cannot hire the work done. 



^70 r T~> 7 r This insect appears in the adult stage 



The Scurfy Bark Louse, ,, . ,., _ 



Chionasfrs furfura Fitch. as flat whlte s P ecks u P n the bark or 



fruit of the host. The female is about 



1-10 inch in diameter and shaped after the outline of a pear, while 

 the male is about one-third as large and more elongated. (Plate 1, 

 Figs. 4 and 5.) With both sexes there is a yellow pellicle at the 

 tip end of the scale. The winter is passed in the egg- stage under 

 the protecting mother scale, hatching 1 occurring- during- the latter 

 part of May or in early June. 



Some closely allied species occur in great numbers at times on 

 park trees and shrubs, but for the most part they have life histories 

 that are similar to the common species and in g-eneral the same 

 remedies will apply. The red-twig 1 dogwood, willows and some cf 

 the rosaceae are particularly subject to such infestation. 



The lime-sulfur wash applied during- the winter is effective, as 

 are also contact sprays applied at hatching- time. However the 

 same difficulty arises here that is encountered in connection with 

 summer applications against the oyster shell bark louse, i. e.\ the 

 brood appears en masse and the time for effective work is as a result 

 very brief. 



*TV " r> . j On account *of similarity in general 



The Putnam Scale, , ' . . x 



Aspidiotus ancylus Putnam. form thls s P ecies 1S frequently mis- 

 taken for the San Jose Scale, especially 



when the infestation is slig-ht and the scales immature. The super- 

 ficial distinguishing features however are as follows: the scale is 

 slightly darker in coloration; the nipple reddish; the spread less 

 rapid; the in jury less severe, and lastly the young exhibit a stronger 

 tendency to settle about the mother, resulting in a somewhat ir* 

 regular infestation. 



This insect occurs more commonly in the towns than in the 

 country, and the trees most generally attacked are hard maple and 

 linden. Tl?e maples in the parks and upon the streets in Cleveland 

 suffer severely from this pest. 



The lime-sulfur is effective against this pest. Applications o 

 limoid and scalecide gave fair returns. 



