Walnut aphid studies in 1955: Experimental systemic aphicide OMPA has outstanding promise but more studies needed before release for commercial use
A. E. Michelbacher, University of California
Earl Oatman, University of California
California Agriculture 10(3):9-14. DOI: 10.3733/ca.v010n03p9.
Summary Not Available – First paragraph follows:
The 1955 infestations of the walnut aphid were exceedingly severe in certain areas, such as Linden. By early May, the average number of aphids found—on the next to the terminal leaflets—in some orchards exceeded 50.
A. E. Michelbacher is Associate Professor of Entomology, University of California, Berkeley. Earl Oatman is Research Assistant, University of California, Berkeley.
The above progress report is based on Research Project No. 1314.