182 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 15 



Stock Solution 



Whale oil soap 40 pounds 



Crude Carbolic acid (25%) 5 gallons 



Distillate (28 Baume) 10 gallons 



Water to make 50 gallons 



First dissolve soap in 10 to 15 gallons of hot water; add crude carbolic acid and 

 distillate and remainder of water. Boil 20 minutes. For use dilute one part of 

 above to 20 parts of water. 



In cases of serious infestation three applications are being made during January 

 and February. 



E. O. EssiG 



Curly Leaf Transmission Experiments with Beet Leafhopper (Eutettix tenella 

 Baker), Summary. 



The beet leafhopper when it hatches from the egg is non-infective. 



Curly leaf is not transmitted through the seeds from "stechlinge" affected with the 

 disease before and after transplanting. 



We have failed to demonstrate up to the present time that the beet leafhopper is 

 a mechanical carrier of curly leaf, or a mechanical carrier in mass infection of a beet. 



The minimum incubation period of the infective principle of curly leaf in the beet 

 leafhopper required four hours at the following temperatures: maximum 103° P.; 

 minimum 94° F. and mean 100° F. and three days in the sugar beet at the following 

 temperatures; maximum 103° F.; minimum 57.7° F. and mean 80.3° F. 



Beet leafhoppers which had been fasted and then the mouth parts contaminated 

 with Bacillus morulans isolated from curly leaf beets or when allowed to puncture 

 the bacteria into the tissue, rubbed on a portion of a beet leaf, failed to transmit the 

 disease. 



Daily inoculations of juice from beets, upon which infective beet leafhoppers 

 had fed from 1-8 days or until the earliest symptom of curly leaf appeared, failed to 

 produce the disease in healthy beets. Juice exuding from curly leaf beets in the field 

 when incoluated into healthy beets also gave negative results. The excrement of 

 infective beet leafhoppers inoculated into the petioles of healthy beets failed to pro- 

 duce curly leaf. The disease did not develop when healthy leaves were rubbed with 

 crushed curly leaf foliage. We have failed to obtain a single case of curly leaf up to 

 present time by inoculating various internal organs from infective beet leafhoppers 

 vivisected in physiological salt solution (.8% normal) and in sap pressed from healthy 

 beets. 



Henry H. P. Severin, Ph.D., 

 Calif. Agr. Exp. Station. 



Anti-Mosquito Convention 



The ninth annual meeting of the New Jersey Mosquito Extermination Association 

 was held at the Hotel Chalfonte, Atlantic City, New Jersey, March 1-3, 1922. The 

 meeting was well attended by mosquito control workers from New Jersey and various 

 sections of the country. The meeting was called to order Wednesday March 1, 

 at 8 P. M., by President Charles Lee Meyers of Jersey City. Mr. Meyer's opening 

 address entitled "Industrial Results of Mosquito Control" brought out several points 

 that are of great economic importance. IVIr. Robert T. Engle of Beach Haven, 

 President Ocean County Mosquito Commission read the next paper, "Resort De- 

 velopment as a Result of Mosquito Control." 



