Yazar
m f webster
29 cilt bulundu.
F. M. Webster · Govt. Print. Off.
13 sayfa · 1907
Agricultural pests / Corn root-aphis / Aphis / Corn / Aphids
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
Sayfa sayısı yok · 1907
Greenbug / Agricultural pests / Grain / Diseases and pests
F. M. Webster · U.S. Dept. of Agriculture, Office of the Secretary
Sayfa sayısı yok · 1916
Grain-louse
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
Sayfa sayısı yok · 1906
Corn / Seeds / Diseases and pests / Agricultural pests
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
Sayfa sayısı yok · 1908
Agricultural pests / Harmolita
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
16 sayfa · 1906
Hessian fly / Wheat / Diseases and pests
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
Sayfa sayısı yok · 1910
Agricultural pests / Clover / Hylastinus obscurus / Diseases and pests
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
22 sayfa · 1909
Agricultural pests / Grain / Toxoptera / Aphids / Greenbug
F. M. Webster · U.S. Dept. of Agriculture, Bureau of Entomology
Sayfa sayısı yok · 1912
Alfalfa / Agricultural pests / Gall midges / Diseases and pests
F. M. Webster · U.S. Dept. of Agriculture
Sayfa sayısı yok · 1913
Corn / Diabrotica / Diseases and pests
F. M. Webster · Ohio Agricultural Experiment Station
95 sayfa · 1895
Grape-vine root-worm / Grapes / Diseases and pests / Ohio Agricultural Experiment Station