SUMMARY OF LIFE HISTORY OF BEET LEAFHOPPER 



(EUTETTIX TENELLA BAKER) 



By Henry H. P. Severix, Ph. D., 

 California Agricultural Experiment Station. 



According to BalP the beet leafhopper {Eutettix tenella Baker) is a 

 "single-brooded species." In his life histors^ chart. Ball indicates that 

 the adults m.ake their appearance on beets in March and the nymphs are 

 present from. May to July in the San Joaquin \"alley and from. May to 

 August in the Salinas Valley of California. 



We-''^ have published an account of the life histor\' of the beet leaf- 

 hopper and reared two broods out-of-doors in the fog belt district at 

 Berkeley during 191<S. 



Stahl^ bred two generations out-of-doors in the fog belt district at 

 Spreckels, California and a third and even fourth brood were obtained in 

 the greenhouse. 



We determ.ined the life history of the beet leafhopper at Manteca, 

 situated in the Northern end of the San Joaquin Valley. A detailed study 

 of the life histon- was started with the dark adults which wintered over 

 in the cultivated area and the worls with the successive generations was 

 conducted during 1919-1920. No breeding experiments have been 

 conducted on the plains and foothills to determine the number of broods, 

 and we are assuming that the first pale green adults which invade the 

 cultivated area represent the first or spring generation. After the first 



iBall, E. D., 1917. The Beet Leafhopper and the Curly Leaf Disease that it 

 Transmits. Utah Agr. Exp. Rta., Bui. 155, pp. 1-56. 



^Severin, H. H. P. 1919. THE BEET LEAFHOPPER. A Report on Investi- 

 ga tions into its Occurrence in California. Facts About Sugar, VIII, No. 7, pp. 130- 

 131. 134; No. 8, pp. 150-151 ; No. 9, pp. 170-171; No. 10, pp. 190-191; No. 11, pp. 210- 

 211; No. 12, pp. 230-231 ; No. 13, 250, 255. 



'Severin, H. H. P. 1919. Investigations of the Beet Leafhopper (Eutettix tenella 

 Baker) in Cahfornia. Jour. Econ. Ent., XII, No. 4, pp. 312-320. 



