Resistance to sun blotch virus in seed source trees of Duke avocado
AuthorsR. M. Burns
R. J. Drake
J. M. Wallace
G. A. Zentmyer
Authors AffiliationsR. M. Burns is Farm Advisor, Ventura County; R. J. Drake is Laboratory Technician Department of Plant Pathology, University of California, Riverside; J. M. Wallace is Professor Department of Plant Pathology, University of California, Riverside; G. A. Zentmyer is Professor and Chairman Department of Plant Pathology, University of California, Riverside.
Hilgardia 23(8):7-8. DOI:10.3733/ca.v023n08p7. August 1969.
Of 12 Duke avocado trees tested, 10 were found to be free of sun blotch virus infection. However, two trees without sun blotch symptoms were infected and apparently both are symptomless carriers. These transmit the virus through seeds to their seedling progeny and can cause infection of the scion tops that are worked on them when used as rootstocks. These studies demonstrate that it is necessary to test all Duke seed-source trees before using them as rootstock parents.
Also in this issue:Agricultural field stations —laboratories of the university
Extension laboratory, U.C., Davis
Influence of weather on the harvesting of high elevation christmas trees
Testing fluorine compounds for chemical mowing of turfgrass
Preplant soil fumigation increases head weights in California lettuce
Mechanical aids to sweet potato harvest
Interaction of environment and genotype in the expression of a virescent gene, pale-yellow-1, of maize