The relation of pear psylla to pear decline … greenhouse tests
oleh: D Jensen, W Erwin
| Format: | Article |
|---|---|
| Diterbitkan: | University of California Agriculture and Natural Resources 1963-01-01 |
Deskripsi
Extensive research by U.C. entomologists, in both greenhouse and field test plots, on the relation of insects to the cause or spread of pear decline disease indicates that the pear psylla, Psylla pyricola Foerster, is the key to the problem.