The green-bug or spring grain-aphis : how to prevent its periodical outbreaks
- Source:
- Farmers' bulletin (United States. Department of Agriculture) ; no. 1217 1921
- Year:
- 1921
- Subject:
- life history, parasitoids, grain crops, Lysiphlebus testaceipes, Schizaphis graminum, biological control agents, grains, natural enemies, Greenbug -- Control, and Grain -- Diseases and pests
- Language:
- English
- Publisher:
- U.S. Dept. of Agriculture
- Collection:
- Organic Roots Collection