Citrus growers and other Ag professionals are invited to attend the Univerity of California, Lindcove Research and Extension Center Annual Citrus Fruit Display and Tasting on Friday December 14th starting at 9:00 A.M. During the Citrus Fruit Display day, you can see and taste more than 100 citrus varieties that are grown at Lindcove.
Education Building Activities 9 am - Noon
Walking tour starts at 10 am
- 10 am: Tour the Citrus Clonal Protection facilities that produce budwood with Dr. Rock Christiano
- 10:30 am: Tour the demonstration orchard with Dr. Tracy Kahn who will discuss new citrus varieties
- 11:30 am: View the action of the new fruit grading system in the packline that provides researchers with detailed information about fruit size, weight and quality demonstrated by Therese Kapaun and Don Cleek
Grafton-Cardwell and Morse have held off suggesting that growers should spray citrus groves in the fall to control bean thrips. There are several reasons for this: (1) to date, bean thrips has been a problem mainly for shipments of navel oranges to Australia and New Zealand and it is difficult to know which fruit will be destined for this market, (2) levels and timing of bean thrips flying into citrus in the fall can vary greatly from year to year (depends a lot on when weed hosts and other plants dry up, when the weather turns cold, etc.; some years, bean thrips move in early and feed on the fall flush, other years this movement is later), (3) bean thrips typically fly into citrus over a 3-6 week period and it would be difficult to maintain an effective pesticide residue on citrus without multiple applications, (4) once the bean thrips are inside the navel of navel oranges, they are difficult to control, and (5) we are looking forward to the registration of ethyl formate as a post-harvest treatment (hopefully in time for the 2013-14 shipping season). An effective post-harvest treatment would be a much more practical means of dealing with this problem than field sprays - only loads of packed citrus destined for AU/NZ would be treated.
The graph below shows the male California red scale pheromone trap catches (green) and the crawler tape catches (red) for a citrus orchard at Lindcove. The scale activity is finally starting to wind down as the night temperatures cool. Male flights peaked at Lindcove this year during March, mid-mid June, late July and early September. Four generations of crawler activity occurred during Mid May, early July, mid-August, and late September. The male flight and crawler activity seems to be winding down now. It may pick up a bit if the daytime weather stays warm, but usually the females stop producing crawlers around November 1.
I just updated my web site to provide a sampling protocol for Asian citrus psyllid for both conventional and organic citrus orchards. Once ACP enters a region, it is very important not to rely on yellow sticky cards to determine if ACP is present after a treatment. Instead, conduct visual examinations of the new flush leaves of 50 trees per block as suggested by this protocol and sampling plan.
See my web site: http://ucanr.org/sites/KACCitrusEntomology/Home/Asian_Citrus_Psyllid/Monitoring or click on the attached files below to see the pdf versions.
Citricola Scale - Update on Resistance and the Efficacy of Insecticides Nearing Registration
Dr. Beth Grafton-Cardwell
University of California
Citrus IPM Specialist and Research Entomologist
Thursday, September 13, 2012, 9:00-10:00 am
Location: Lindcove Research & Extension Center
22963 Carson Ave, Exeter CA
(559) 592-2408 ext 151 (call for directions)
We will bring the mobile teaching lab to an LREC orchard in which we are comparing registered and unregistered insecticides. Several new insecticides are nearing registration (2013-2014) and the efficacy of these products will be discussed. Field monitoring of citricola scale will be demonstrated including recommended treatment threshold densities for the fall period. We will also discuss ongoing organophosphate insecticide resistance studies.