Pear psylla proven carrier of pear decline virus
oleh: D Jensen, W Griggs, C Gonzales, H Schneider
| Format: | Article |
|---|---|
| Diterbitkan: | University of California Agriculture and Natural Resources 1964-03-01 |
Deskripsi
Recent studies provide very strong evidence that quick decline disease of pears is caused by a virus transmitted by the pear psylla rather than by an insect toxin alone.