Late plantings reduce yellows virus infection, improve beet yields and sugar production at Davis
AuthorsF. J. Hills
W. H. Lange
R. S. Loomis
J. L. Reed
D. H. Hall
Authors AffiliationsF. J. Hills is Extension Agronomist, University of California, Davis; W. H. Lange is Professor of Entomology, University of California, Davis; R. S. Loomis is Assistant Agronomist, University of California, Davis; J. L. Reed is Research Assistant, University of California, Davis; D. H. Hall is Extension Plant Pathologist, University of California, Davis.
Hilgardia 17(3):14-15. DOI:10.3733/ca.v017n03p14. March 1963.
Weekly spraying for aphid control reduced natural infection by yellows viruses from 50% to 14% in sugar beets planted April 10 and increased sugar yield 30% by mid-October. While spraying this often is not an economical means of control for virus yellows, the experiment showed that a considerable reduction in yields can be caused by naturally occurring strains of yellows viruses. However, sugar beets planted May 7 remained essentially virus free and by October 22 yielded 10% more sugar than beets planted in April, half of which became diseased.
Also in this issue:Improving the productivity of pruning labor in the vineyard
Fungicidal corm dips for gladiolus
Effect of seed piece spacing on the production of sweet potato transplants
Thrips control on nectarines
West Side Field Station
Cotton price policy and foreign production
A progress report: Concentrate spraying controls pests in deciduous fruit and nut crop tests
Nematocides for use on alfalfa
Longevity, or life histories, of leafhopper species on virus-infected and on healthy plants
Transmission of California aster-yellows virus by the first reported leafhopper vector in Gyponinae
Taxonomy, distribution, and food plants of Gyponana hasta, a leafhopper vector of California aster-yellows virus