00514nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100001800076245010300094260004600197300001000243440004400253650005900297Para_5326CHAP220125s1921    xx            000 0 und d  a203855  cCHAP  aWalton, W. R.  aThe green-bug or spring grain-aphis  :b how to prevent its periodical outbreaks  /c W. R. Walton  aWashington  :b Department of Agriculture  a11 p.  aEUA. Dep. of Agri. Farmers' Bull.; 1217  aCoccus viridis  Toxoptera graminum  Cereales x Plagas