24 results on '"P. O. Ritcher"'
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2. Reports of Standing Committees for 1973
3. Reports of Standing Committees for 1975
4. Reports of Standing Committees for 1976
5. Reports of Standing Committees for 1974
6. Nicotine in Oil A Promising Insecticide for Horticultural Purposes
7. Descriptions of the Larvae of Some Ruteline Beetles with Keys to Tribes and Species (Scarabaeidae)1
8. White Grub Control with Dichloroethyl Ether1
9. Larger Apple Curculio in Wisconsin
10. Control of Rootworms Affecting Peanuts1
11. Methyl Bromide Fumigation for Destruction of the Strawberry Crown Borer12
12. Minutes, Opening Session, Business Meetings, Memphis Meeting
13. Silicates of Soda Incorporated With Lead Arsenate in the Last Regular Spray an Aid to Residue Removal1
14. Spiracles of adult Scarabaeoidea (Coleoptera) and tir phylogenetic significance. II. Thoracic spiracles and adjacent sclerites
15. Report of the Committee on Entomological Nomenclature
16. Proceedings of the Thirty-Ninth Annual Meeting
17. New Materials for Control of Strawberry Crown Borer
18. Dandelion Control with Dichloroethyl Ether 1
19. Poison Bait for Control of the Strawberry Crown Bore12
20. Cyclocephala immaculata Olivo as a Test Insect*
21. Floyd Elroy Ellertson 1919–1963
22. Entomological Society of America OFFICERS 1971
23. Aphodius pardalis Lec. A New Turf Pest12
24. Notes on the Life Cycle and Myrmecophilous Adaptations of Cremastocheilus Armatus (Coleoptera: Scarabaeidae)
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