- Author: Ben Faber
When reviewing possible problems your citrus might have, it's easy to jump to the conclusion that it is a virus. That's because viruses are a major problem around the world in citrus and the effects can be slow, chronic and debilitating or fast and deadly. Images get posted on the web, and if those symptoms look like something your tree has, then by golly you have a virus. Well, actually viruses are everywhere and in most plants, so you probably do have a virus or viruses, but not plant debilitating one. California, has had a pretty thorough nursery inspection procedure in place for many years and the likelihood of a virus causing a problem is less likely here than in many parts of the world.
In most cases viruses are difficult to eradicate in practice, so it is best to remove them before they get out in the field. The Citrus Clonal Protection Program (http://www.ccnb.info/page.php?s=2&c=3) weeds out citrus viruses before they get to wholesale nurseries and into the trade. That does not mean that we don‘t have debilitating viruses in the California industry. We do. Tristeza is in some of our orange orchards and that can lead to significant yield reductions and tree death (http://www.ipm.ucdavis.edu/PMG/r107101311.html.). Tristeza is spread by the melon aphid and is hard to control without good control of the aphid. In many older orchards there is exocortis and psorosis http://www.ipm.ucdavis.edu/PMG/r107100100.html; http://www.ipm.ucdavis.edu/PMG/r107100511.html). These are graft transmissible and why it is not good, in fact unlawful, to propagate trees with uncertified budwood.
In most cases in California if you are having symptoms of unhealthy in your trees it's most likely due to an irrigation problem (too much, too little, poor timing), a nutrient deficiency and possibly a fungal disease (most likely a root one such as armillaria or Phytophthora). Or in this day, it could be the start of Huanglongbing vectored by Asian Citrus Psyllid (http://www.ipm.ucdavis.edu/PMG/r107304411.html). Before jumping to the conclusion that there is a virus in your trees. Check out the most common problems for California citrus first (http://www.ipm.ucdavis.edu/PMG/C107/m107bpleaftwigdis.html). There are enough of those anyway.
- Author: Sonia Rios
The macadamia is native to Australia and has been grown in California continuously since 1879 (Arpaia 1994). In addition to the commercial growers, macadamias make excellent back yard trees, are beautiful as landscaping, and can be grown in tubs on your patio. There will be a great opportunity for all that are interested to learn about growing macadamia nuts in California.
The University of California Cooperative Extension in conjunction with the California Macadamia Society and the Gold Crown Macadamia Association will hold their Annual Field Day on Saturday 26 September 2015, 8:45 A.M. to 1:30 P.M. at the home of Jim and Jane Zeimantz, 3410 Alta Vista Drive, Fallbrook, California. There will be classes on topics relevant to the current macadamia industry, with plenty of opportunities for you to ask questions, both general in nature and about the specifics of your operations. We will also be serving a continental breakfast and a delicious lunch. Please plan to join us for a fun and information filled day.
Cost: $20.00 per person with pre-registration, $25.00 at the event. That includes a continental breakfast and delicious lunch.
Contact Person: Jim Russell, (760) 728-8081 e-mail russellfarms@Roadrunner.com
Visit www.macnuts.org/fieldday.htm for a registration form.
The California Macadamia Society has members all over the world.
The Objectives of the California Macadamia Society are:
To furnish authoritative and timely information on Macadamia culture.
To assist growers with harvesting and marketing data.
To advise nurserymen on varieties and propagation.
To encourage the University to assist the industry with research.
To formulate policies, where indicated, for presentation to the state legislature.
The Objectives of the California Macadamia Association are:
To assure a reliable market to our growers.
To provide the highest return to our growers for nuts delivered.
To explore new and developing markets for macadamia nuts.
From I-5 take exit 54a (east) onto Ca-76, Pala Road. Go 13.5 miles and turn left (north) onto Via Monserate. Go 1.3 miles and turn right on Alta Vista Drive. Go 1 mile to 3410 Alta Vista Drive, on the right.
From I-15 take exit 46 (west) onto Ca-76, Pala Road. Go 3.4 miles and turn right (north) onto Via Monserate. Go 1.3 miles and turn right on Alta Vista Drive. Go 1 mile to 3410 Alta Vista Drive, on the right.
Arpaia, M.L. 1994. Macadamia situation for selected countries. California Macadamia Soc. Yearb. 40:27-30.
- Author: Gary S. Bender
- Author: Ben Faber