Quick Decline of Orange Trees--A Virus Disease

Publisher Website
Google Scholar
Abstract
Live buds from quick-decline trees were placed in 100 healthy 1-yr.-old Valencia orange trees grown on sour orange stock, and 100 of these trees were used as checks. Healthy buds were placed in 50 of the latter group, and 50 remained unbudded. About 3 months later a few trees into which diseased buds had been inserted began to show symptoms. A month thereafter, 36% of the trees in which diseased buds had been inserted showed symptoms; only 2% showed disease in each of the 2 groups of the check trees. Since all these test trees were healthy trees from a non-diseased area and were planted in a quick-decline area in the open, the 2% was presumably caused by natural infection. The great preponderance of diseased trees in the inoculated group as compared with the checks, together with other data which indicate that the disease is not due primarily to organisms, faulty nutrition, or other factors, leads to the conclusion that it is of the nature of a virus disease.

This publication has 0 references indexed in Scilit: