REPORT OF THE STATE ENTOMOLOGIST I905 



97 



Fig. 10 Adult of European elm case-bearer 

 (Original) 



luteola Miill. The two species were abundant enough, so that 

 the foHage in certain portions of the village was badly marked. 

 The general result of injury by 

 these forms is somewhat similar 

 though easily separable. The 

 areas mined by the case-bearer 

 are markedly rectangular, being 

 bounded on either side as a rule 

 by a parallel vein and extending 

 rather evenly for some distance 

 from the central feeding hole 

 which is easily seen when looking 

 up toward a bright sky. The 

 eroded, semitransparent, skeletonized areas produced by elm leaf 

 beetle larvae are at once recognized by their greater irregularity, the 

 lack of the central feeding orifice and the fact that there is no min- 

 ing of the foliage. This species, like the common cigar case-bearer 

 on our fruit trees, should be easily controlled by early and thorough 

 spraying with an arsenical poison, making the application at the 

 time the leaves begin to appear. 



Cottony maple scale (P u 1 v i n a r i a i n n u m e r a b 1 i s 

 (R'athv.). This species was observed in some numbers on the 

 lower limbs of a soft maple at Glen Cove and it 

 has been reported as unusually abundant in St 

 Lawrence county. It is by far the more common 

 insect pest covered with woolly matter, occurring 

 on maple trees, particularly on Long Island where 

 it is likely to cause more or less injury from year 

 to year. It can be controlled by thorough spray- 

 ing in midsummer with a kerosene emulsion, 

 using about lo to 12% of oil. Winter treatment 

 with the kerosene emulsion diluted with three 

 parts of water, or a whale oil soap solution, 

 I pound to a gallon, has been found very effective 

 ^?caie\ much"Lkrgeci ^v Mr S. Arthur Johnson in Denver, Col. This 

 (Original) latter method results in a great saving, as one 



fourth the amount of the insecticide necessary to spray a tree in 

 foliage is sufficient to cover it after the leaves have fallen. 



Maple Phenacoccus (Phenacoccus acericola King ) . 

 This, ordinarily a rare insect, has attracted more attention in 

 recent years on account of its abundance on sugar maples in 

 Albany and vicinity. The first general outbreak which came to 



