54 TPIE COTTOiSTY MAPLE SCALE. 



Anullicr excellent lime-sulphur wash is made withuut ex- 

 ternal heat as follows : 



"Add 30 lbs. of lime to 6 gals, of warm water. While it 

 is slaking add 15 lbs. of powdered sulphur, which has previ- 

 ously been made into a thin paste. Mix it thoroly with the 

 slaking- lime. Then add four to six pounds of caustic soda to 

 prolong the boiling, adding water to the hot mass from time 

 to time as needed. Keep thoroly stirred, and when all chem- 

 ical action has ceased add 44 gallons of water (making 50 in 

 all)." Eight to ten pounds of sal soda can be used in place 

 of the caustic soda if desired. 



This wash has given excellent satisfaction, in some cases. 



Minnesota needs laws to prevent the sale here of 

 adulterated and inferior paris green. 



THE COTTONY MAPLE SCALE, 

 Pulvinaria innumerabilis. 



The accompanying photograph is a good illustration of the 

 injury caused by this very common pest. Not only has it con- 

 tinued to afflict our shade trees in Minnesota, but it has been 

 destructive in many other localities of the middle West, as well 

 as in some states hearer the Rocky Mountains. Milwaukee 

 reports great damage to shade trees in its streets and parks, 

 and correspondence with Chicago parties indicates a similar 

 condition there. In fact many trees have been killed by this 

 scale in both of these places. As evidence of its wide distribu- 

 tion in the United States, we might say that it occurs in all but 

 about eighteen of the states, ranging from Washington and 

 southern California on the west to New York and Florida on 

 the east, and from Wisconsin and Minnesota to Texas. In a 

 recent excellent bulletin from Colorado, wdiich contains a map 

 showing its distribution, we note that Mr. Johnson has failed 

 to indicate that it occurs in Minnesota. As a matter of fact, 

 it is one of the worst pests we have on soft maple, and has 

 been injurious here for several years. The Box Elder Maple 

 is also a sufferer, and the Elm, beside a large number of other 

 trees, and many vines and shrubs. The Hard Maple does not 

 appear to be affected. 



iM.rtunatelv this scale, a native of this country, has many 



