Susceptibility to dust and spray mixtures of the pear psylla (Psylla pyricola forster)
Hartzell, F.Z.
Susceptibility to dust and spray mixtures of the pear psylla (Psylla pyricola forster) - Geneva 1925 - 1-123 p. - Psylla New York State Agricultural Experiment Station. Bulletin No. 527 .
Susceptibility to dust and spray mixtures of the pear psylla (Psylla pyricola forster) - Geneva 1925 - 1-123 p. - Psylla New York State Agricultural Experiment Station. Bulletin No. 527 .