The green-bug or spring grain-aphis : how to prevent its periodical outbreaks /
Walton, W. R.
The green-bug or spring grain-aphis : how to prevent its periodical outbreaks / W. R. Walton - Washington : Department of Agriculture - 11 p. - EUA. Dep. of Agri. Farmers' Bull.; 1217 .
203855
Coccus viridis Toxoptera graminum Cereales -- Plagas
The green-bug or spring grain-aphis : how to prevent its periodical outbreaks / W. R. Walton - Washington : Department of Agriculture - 11 p. - EUA. Dep. of Agri. Farmers' Bull.; 1217 .
203855
Coccus viridis Toxoptera graminum Cereales -- Plagas
