354 EXPERIMENT STATION RECORD. [Vol.40 



in which lar^o numbers of apple leaf-hoppers were used typical leaf burn was 

 produced in four days. 



Genera of the Eupterygidae, W. L. McAtee (Proc. Bin!. Boo. Wash., SI 

 (191$), pp. 109-12.' f ). — This relates to a group of leaf hoppers. 



The early stages of Corythucha pergandei, H. B. WxiSS and E. L. Dicker- 

 son {Ent. Newt, 20 {1918), No. 6, pp. 205-209, fig. 1).— The lacewing bug here 

 considered is rather widely distributed in New Jersey, and has been found by 

 the authors on alder < Alnus glutinosa) and in nurseries on birch (Bctula 

 nigra, B. liitea, and B. popuHfolia). 



The life history and early stages of Corythucha parshleyi, H. P.. W 

 and E. L. Dicxxason {Canad. Bnt., 50 {1918), Wo. It, pp. 101-406).— This lace- 

 wing bug has been found in New Jersey on butternut {Juglana oineroo), walnut 

 (J. nigra), and Japanese walnut (•/. nibboldiana) . 



Psyllidae of the vicinity of Washington, D. C. with description of a new 

 species of Aphalara. W. L. M( Ami: {Bnt. 1918), Ao. 6. pp. . 



fig. 1). 



Practical results in spraying a commercial orchard for the green apple 

 bug. W. II. r.KiuwN {Canad. Bnt., 50 {1918), No. it, pp. 898-897).- This is an 

 account of demonstration control work in Nova Scotia during 1917 with bpffvs 

 communis novascotiensis, an acconnl of which inset by the author lias been 

 previously ooted 1 I-:, s. EL, 87, p. 482). 



The experimental data presented show that economically profitable results 

 may be expected from control work. This consists in the application of black- 

 Leaf 40, l pint to i"" gaL In the application made Immediately before the 

 blossoms opened it was combined with Lime-sulphur and arsenate of lime, in 

 the after-blossom application sodium sulphid (soluble sulphur) was used. 



A preliminary report on the clover aphis and methods for its control, 

 K. II. Smith {Idaho Bta. r.ui. lit {1918), pp. S-i .',).— This is a report 



of observations ami experiments conducted Largely during the year of 1918, In 

 continuation of earlier work by Parks and by Burrill. A paper by Burrlll 

 has been noted (B. s. EL, 89, p. 86 >)■ 



The clover aphis {Aphis bakeri), which occurs throughout the United States, 

 was tirst recorded from Colorado In 1895, in which year it was described 

 (!■;. s. EL, v, p. 280). it was reported as doing serious damage In the North- 

 west in 1907. In Idaho it has been abundant on clover sine,- 1913, the great 

 trouble with honeydew being experienced In 1916, when it was estimated that 

 90 per cent of all red clover and alsike clover seed marketed in the State was 

 sticky. 



The author considers $1,500,000 to be a conservative estimate of the loss 

 caused by the clover aphis in Idaho during the past four years. The clover 

 aphis has been an important factor in reducing the acreage Of red clover and 

 alsike clover 75 and 90 per cent, respectively, during 1917 and 1918. 



"All clover aphids found in clover fields are 'agamic' females that give 

 birth to Living young at the rate of i or 5 per day. During the fall some of the 

 aphids leave clover plants and lly to apple, pear, quince, ornamental crab, and 

 hawthorn trees. Here they give birth to certain small aphids which deposit 

 eggs on the small branches of these trees. The eggs hatch in the following 

 spring. 



"In Idaho the clover aphis has been found to feed only on red. alsike. and, 

 to a limited extent, on white clovers. When the clover aphids are present in 

 small numbers they will be found under the 'stipules' of the clover Leavi 

 The aphis injures clover plants by stunting their growth, by causing them It) 

 ripen prematurely, by killing flowering branches, by blighting seeds, by C0V< 

 ing the seeds with honeydew, and injuring the marketing quality. 



