9 
13. Cull Onions as a Trap Crop for the Onion Maggot. (5 min.) 
J. E. Dudley, Jr., Madison, Wise. 
Results of experiments in the use of cull onions planted early in the spring to attract 
adults of the onion maggot, and yields. 
14. The Pea Aphis (.Illinoia pisi) with Special Reference to Alfalfa. 
(10 min.) R. C. Smith and E. W. Davis, Manhattan, Kansas. 
An account of recent outbreaks in Kansas and a summary of field and laboratory 
observations on its habits and life history. 
15. Natural Enemies of the Pea Aphid (.Illinoia pisi Kalt.); their 
Abundance and Distribution in Wisconsin. (5 min.) Chas. L. Fluke, 
Jr., Madison, Wise. 
The pea aphid predators are many and varied. Studies this past year at Columbus, 
Wis. give some idea of the abundance of certain groups and the relative importance 
of others. Numerous species not heretofore mentioned are included in the list. 
16. Climate as Related to Mexican Bean Beetle Distribution. (1.0 
min.) (Lantern.) J. E. Graf, Washington, D. C. 
17. Recent Developments of Mexican Bean Beetle Investigations. 
(10 min.) (Lantern.) Neale F. Howard, Birmingham, Ala. 
Brief review of spread, biology and control of Mexican bean beetle. 
18. Non-arsenicaTs for Chewing Insects. (10 min.) S. Marcovitch, 
Knoxville, Tenn. 
19. Percentage of Curly Leaf Infection in Beet Leafhopper (Eutettix 
tenella Baker) and Winter Host Plants under Field Conditions. (5 min.) 
Henry H. Severin, Berkeley, Calif. 
20. The Control of the Spinach Aphis, Myzus persicae Sulz., Infest¬ 
ing Cauliflower Seed Beds on Long Island, by Tobacco Dust Mixtures. 
(10 min.) (Lantern.) H. C. Huckett, Riverhead, Long Island, N. Y. 
21. Celery Leaf Tyer in California. (10 min.) R. E. Campbell, 
Alhambra, Calif. 
Insects Affecting Greenhouse Crops 
22. Further Data on the use of Calcium Cyanide as a Greenhouse 
Fumigant. (5 min.) C. A. Weigel, Washington, D. C. 
Observations on the behavior of calcium cyanide with reference to the length of ex¬ 
posure. Results are given of further tests with this material when used under 
commercial growing conditions in greenhouses. 
