Yazar
peter h westigard
2 cilt bulundu.
Cilt sonuçları
Bionomics and control of the two-spotted spider mite on pear in southern Oregon
Peter H. Westigard · Agricultural Experiment Station, Oregon State University
32 sayfa · 1967
Spider mites / Tetranychus urticae / Pear / Diseases and pests
The pear psylla in Oregon
Peter H. Westigard · Agricultural Experiment Station, Oregon State University
22 sayfa · 1972
Psylla / Pear / Diseases and pests