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Insect transmission, host range, and properties of the crinkle-leaf strain of western-celery-mosaic virus

1945; University of California, Agriculture and Natural Resources; Volume: 16; Issue: 8 Linguagem: Inglês

10.3733/hilg.v16n08p361

0073-2230

Julius H. Freitag, Henry H. P. Severin,

Plant Parasitism and Resistance

IN THE last five years several viroses affecting celery have been observed to occur naturally in California.These, except western celery mosaic, have been only briefly described in previous papers (Freitag and Severin, 1939;Severin and Freitag, 1938).4,A mosaic disease apparently different from western celery mosaic was first observed near Milpitas in the Santa Clara Valley during November, 1937.The symptoms resemble those of western celery mosaic except that the leaves are, as a rule, severely crinkled.The disease is not common and has been found only rarely during routine observation of celery fields.An investigation was undertaken to determine the symptoms, properties, and host range; likewise, the relative ability of various aphid species that breed on celery to transmit the virus.Aphids were compared with mechanical inoculation as a means of transmitting the virus.The retention of the virus by three species of aphids was studied experimentally.March, 1945] Freitag....Severin: Celery Crinkle-Leaf-Mosaic Virus 363 inoculation, the veins cleared; then chlorotic spotting and streaking appeared along them.The irregular chlorotic areas on the leaflets and the sunken dark brown areas on the petioles became necrotic.Infected carrots were often dwarfed and had curled, malformed, dwarfed leaves.Plants That Failed to Develop Infection.-Thefollowing plants, when inoculated with juice from infected celery, failed to develop infection under greenhouse conditions.An attempt was made to recover the virus from all inoculated plants even though they failed to develop symptoms. ChenopodiaceaeSugar beet, Beta vulgaris L.