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f z hartzell

2 cilt bulundu.

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Diseases and pestsSusceptibility to dust and spray mixtures of the pear psylla (Psylla pyricola Förster)F. Z. Hartzell

Susceptibility to dust and spray mixtures of the pear psylla (Psylla pyricola Förster)

F. Z. Hartzell · New York State Agricultural Experiment Station

123 sayfa · 1925

Psylla / Control / Pears / Diseases and pests

Cherry leaf-beetleThe cherry leaf-beetleF. Z. Hartzell

The cherry leaf-beetle

F. Z. Hartzell · New York Agricultural Experiment Station

820 sayfa · 1917

Cherry leaf-beetle