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Show Knowlton: 1937] Control of the Beet Leafhopper in' Utah 137 Bibliography With 1. some annotations and chronologically arranged. Knab, F. 1915. Two new species of Pipunculus (Diptera : BioI. Soc. Wash. 28: 83-86. 2. Pipunculidae). Proc. Reared from E. tenellus. Hartung, W. J. and Severin, H. H. P. 1915. Natural enemies of the sugar beet leafhopper in California. Calif. Hort. Com. Mo. Bul. 4: 277-279. Reported 33.6 per cent parasitism in 1914 by Pipunculus industrius Knab, P. vagabttndus Knab, and Gonatopus contortulus Patton; also a fungus disease. 3. Smith, H. S. 1916. Beet leafhopper parasites. Calif. Hort. Mo. Bul. 5: 299. Ootetristichus beatus colony imported from Hawaii, hoped it would attack E tenellus 4. Ball, E. D. 1917. The beet leafhopper and the curly-leaf disease that it transmits. Utah Agr. Exp. Sta. But. ISS: 51. 5. Hecks. G. J. 1918. Insectary tempted tenellus. 6. division. to colonize Calif. Hort. an egg Com. Mo. But. 7: parasite frc_m Australia 7. upon At E. Vosler, E. J. 1919. Some work of the insectary division in connection with at tempted introduction of natural enemies of the beet leafhopper. Calif. Hort. Com. Mo. Bul. 8: 231-239. Introduced a dryinid; no parasites emerged. 7. Hartung, W. J. 1919. Enemies of the leafhopper. Natural foes of Eutettix tenello in California. Facts about Sugar, 8: 470-471, 492-493. 8. Smith, H. S. 1919. Biennial report of the insectary division. Calif. Hort. Com. Mo. Bul. 8: 44-51. Two expeditions to Australia, hoping to import natural enemies of E. tenellus ; none became established. 9. Stahl, C. F. 1920. Studies of the life-history and habits of the beet leafhopper. Jr. Agr. Rsch. 20: 245-252 Egg parasites, Polynema eutettisi Gir., Abbella subftava Gir. and Anagrus giraulti Crawf. 10. Severin, H. H. P. and Hartung, W. J. 1923. Entomology and parasitology. Calif. Agr, Ex_p. Sta. Rept. 1922-1923; 125-126. Neides muticus (Say), Zelus socius tru., Nobis kalmii Reut. Iridomvrme» humilis Mayr, Geocoris pollens Stat, a mite, Anihemlella rex Gir., a Gordiacea hair worm, Stylops. 3.2 per cent internal parasitism 1913; 33/6 in 1914. 11. Severin H. H. P. 1924. Natural enemies of the beet leafhopper (Esuetti« tenella Ba ker). Jr. Econ. Ent. 17: 369-377. Anaphes sp. near hercules, Gonaiocerus sp., Aphelinoides plutella Gir., Reduvicolus kalmii Reut., spider, Chrysopa californica Coq. |