352 EXPERIMENT STATION RECORD. [Vol.43 



dusted tree. Observations made upon several sprayed trees in bloom in the 

 oi>en show that the bees work the sjirayt'd trees when they are at liberty and 

 when there are unsprayed trees adjoininc:. 



Studies of the life history of the Hessian fly in different sections of the 

 State were continued during the year. Observations were made in several 

 fields, and in no case was spring wheat infested as heavily as the winter 

 wheat. 



Observations and correspondence from various parts of the State showed 

 that the joint-worm bad done- more injury to the wheat crop during the past 

 summer than had the Hessian fly. In many fields from one-fourth to one-third 

 of the yield of grain was destroyed. 



The wheat midge was more numerous during the year than for many years, 

 having been reported from more than half the counties in the State. Grass- 

 hoppers were so abundant in may sections of the State that whole fields of grain 

 were practically destroyed or greatly injured. The army worm was more 

 numerous and destructive in the State than at any time during the Inst 20 years. 

 The distribution of the 17-year cicada which appeared during the year was 

 much more irregular than has been the case with previous broods, but young 

 fruit trees, especially those in sod, sustained serious injury from it in some 

 communities. 



Injurious insects of the garden (New Mexico Sta. Rpt. 1919, pp. 16, 17). — 

 In tests made, it was found that kerosene emulsion used at the rate of 1:12 

 was more effective than blackleaf 40, 1 : 600, in controlling the cabbage aphis. 

 A 2 per cent solution of lysol, with sticker consisting of commercial rosin fish 

 oil, was very effective but too expensive from a commercial point of view. 

 Tests were made of carbon bisulphid as a fumigant in controlling this insect, 

 and the results seem to show that the method can be made practical. The 

 fumigator used, which was 16 ft. long, 2.5 ft. wide, and 3.5 ft. high, is made 

 to drag astride the cabbage rows. 



Insect pests [at Yuma Experiment Farm in 1918], II. E. Blair {U. S. 

 Dcpt. A(jr., Dept. Circ. 75 {1920), pp. 21, 22).— The cotton aphis is said to have 

 been the first pest that became generally detrimental and was found in great 

 numbers until late in July. In some fields serious loss resulted through the 

 heavy shedding of squares. The cotton bolhvorm, which was in great 

 abundance during July and early August, was the greatest source of decrease, 

 in some fields the loss caused by it being estimated at 70 per cent. Next in 

 importance to the cotton bollworm came plant bugs as insect depredators. 

 Other insects which are a source of injury to cotton but were of minor im- 

 portance are cutworms iPeridroma sp.), wireworms {MonocrepidiuH sp.), the 

 cotton leaf -perforator {Bucculatrix thurherieUa Busck), the salt-marsh cater- 

 pillar, the red spider {Tetranijchus bimaculattts Harvey), and grasshoppers. 

 Mention is made of a number of other insect pests which sometimes injure 

 crop plants in the region but were not seriously abundant during the year. 



Dust V. spray for control of sour cherry pests in Pennsylvania, J. G. 

 Sanders and D. M. DeLong (Jour. Econ. Ent., 13 {1920), No. 2, pp. 208-210).— . 

 Control work against enemies of the sour cherry in Erie County, Pa., carried] 

 on during the summer of 1919, indicates that sulphur-arsenate of lead dust,i! 

 90:10, gives the best results on account of the rapidity and ease of applica-J 

 tion and the high efficiency in the control of curculio, slug, and leaf spot. 



Important foreign insect pests collected on imported nursery stock ii 

 1919, E. R. Sasscer {.Jour. Econ. Ent., 13 {1920), No. 2, pp. 181-18.',).— The^ 

 more important findings of the year 1919 are noted. 



Insect powder, C. C. McDonnell, R. C. Roark, and G. L. Keenan {U. fifri 

 Dept. Agr. Bui. 824 {1920), pp. 100, pis. .^).— The sophistication and adultery 



