http://ucanr.org/sites/KACCitrusEntomology/Citrus_Pest_Blog/index.cfm?blogrss=2574&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed Beth's blog about citrus pests en-us UC ANR http://cyber.law.harvard.edu/rss/ Sat, 18 May 2013 19:52:26 PST Sat, 18 May 2013 19:52:26 PST UC ANR California red scale: The biofix for California red scale was March 11-25 for various areas of the San Joaquin Valley and degree days have been accumulating ever since. Kern County is always warmest and has reached the 550 dd 1st crawler emergence point. The other counties will reach that mark in the next two weeks. It has been an exceptionally warm spring and so we are about 50 degree days ahead of the 30 year average. See my web page for Monday updates.......
]]> Thu, 02 May 2013 09:36:34 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10308&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10308 On April 22 a field event was held at Lindcove with speakers Joseph Morse from UC Riverside and Jim Cranney from the California Citrus Quality Council. The issue discussed was how California citrus growers are going to prevent fruit from arriving in Korea with live Fuller rose beetle eggs, now that Korea is no longer going to fumigate citrus. Korea will reject citrus shipments if live Fuller rose beetle eggs are found. Speakers suggested that a systems approach that combines several......
]]> Wed, 24 Apr 2013 09:19:04 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10232&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10232 Pheromone traps put out at the end of February help determine when the male California red scales begin to fly. Each orchard is slightly different, depending on orientation, density of trees and location in the valley (Kern is quite a bit warmer than Madera). We trap for scales in Tulare County, and call around for biofixes in the other counties. Our web page shows county-wide biofixes of March 18 for Kern, March 25 for Tulare, and likely April 1 for Fresno and Madera.......
]]> Mon, 25 Mar 2013 13:43:09 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9605&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9605 Its March and it is the time of year when the cottony cushion scales are maturing into large females on the trunks of the tree. They especially like plantings of grapefruit and mandarins with dense canopies. It is also the time of year when the vedalia beetles arrive and begin laying their bright red eggs on the cottony cushion scale females. The eggs will hatch and the vedalia larvae will consume the eggs inside the cottony cushion scale egg sac. The adult beetles are voracious predators......
]]> Mon, 11 Mar 2013 08:00:05 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9472&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9472 The UC citrus entomology group is sharing booth L36 with the Citrus Research Board at the World Ag Expo. Come visit us there....
]]> Wed, 13 Feb 2013 07:49:17 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9287&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9287 I am often asked what cold weather does to insect populations. It depends on the insect, the stage it is in and where it is located on the tree. For moths such as citrus leafminer, the pupae survive, but many of the larvae inside the mines of tender flush leaves are killed as the flush is burned by the cold. For California red scale, the younger instars tend to die off, leaving mostly the adult stages. Citricola scales are in the 2nd instar stage deep inside the tree infesting twigs and......
]]> Mon, 14 Jan 2013 08:13:18 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9059&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=9059 I was asked recently to put together a photo identification sheet for Asian citrus psyllid adults, nymphs and eggs. To obtain a copy, see my web site under Citrus Insect Pests/Asian Citrus Psyllid/Monitoring- Recognizing ACP Stages or click on this link: http://ucanr.edu/sites/KACCitrusEntomology/Home/Asian_Citrus_Psyllid/Monitoring/ It is very important that PCAs go beyond relying on yellow sticky cards and learn to recognize the psyllid stages and monitor orchards using visual surveys of......
]]> Mon, 31 Dec 2012 13:21:50 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8981&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8981 Fri, 14 Dec 2012 06:16:15 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8898&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8898 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......
]]> Tue, 13 Nov 2012 14:49:33 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8719&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8719 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......
]]> Tue, 16 Oct 2012 15:20:36 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8527&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8527 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......
]]> Fri, 14 Sep 2012 16:49:58 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8331&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8331 Citricola Scale - Update on Resistance and the Efficacy of Insecticides Nearing Registration Dr. Beth Grafton-CardwellUniversity 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......
]]> Wed, 29 Aug 2012 05:57:15 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8240&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8240 The spread of the Asian citrus psyllid in southern California continues eastward. The number of find sites is so large in the residential areas of Los Angeles, Riverside and San Bernardino counties, that the CDFA residental site treatment program has shifted to treating only around commercial citrus orchards to help protect them. In areas where the psyllid population densities are much lower, such as Imperial, San Diego and Ventura counties, all find sites are being treated and the commercial......
]]> Fri, 10 Aug 2012 07:10:52 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8119&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=8119 Citrus peelminer generations occur every 580 degree days after the first flight in March. The 3rd citrus peelminer flight that lays eggs on pummelos and grapefruit began the week of June 18. We are now experiencing the 4th flight and in another 580 degree days the fifth flight will occur, which is the one that attacks susceptible orange varieties such as Fukumoto and Atwood. For more info, see the degree days on the web page:......
]]> Mon, 16 Jul 2012 16:17:46 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7941&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7941 The 2nd crawler emergence begins at 1650 degree days (above a 53oF threshold after the 1st male flight in early March). Kern and Tulare counties will be reaching that threshold next week. See my web site for details: http://ucanr.org/sites/KACCitrusEntomology/Home/California_Red_Scale/Degree_Days_885/ Pesticides like Movento that require 1-2 weeks for uptake should be applied now. Products that kill crawlers directly such as organophosphates and oils should be applied as soon as the peak of......
]]> Fri, 06 Jul 2012 09:55:05 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7865&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7865 Mon, 11 Jun 2012 10:04:28 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7692&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7692 First generation California red scale crawlers emerge at 550 degree days (DD). As of Monday, Kern County had accumulated 483 DD, and so the crawlers will begin emerging next week. Tulare County accumulated 443 DD and crawlers should emerge in the next 10-14 days. Fresno and Madera crawlers will emerge after that. See my web site for graphs of the progress of the degree days and a comparison to the 30 year average (we are about a week later than normal).......
]]> Wed, 09 May 2012 16:21:22 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7464&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7464 Several times a year, researchers from Belize, Mexico and the US meet to discuss research and management progress on huanglongbing (HLB) disease of citrus and its vector Asian citrus psyllid (ACP).  This week they met in Visalia.  I came away from the meeting with several observations. When HLB appears in a new region it spreads very fast when vectored by psyllids (a few years to move across Mexico to some of their major producing areas).  Research in Florida continues to demonstrate that......
]]> Sat, 21 Apr 2012 13:04:04 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7316&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7316 In Tulare County, the first flight of male red scales began the week of March 19, so we are using that as the biofix for the San Joaquin Valley.  As our degree day page shows http://ucanr.org/sites/KACCitrusEntomology/Home/California_Red_Scale/Degree_Days_885/the scales have accumulated 117-171 degree days so far, depending on location.  This is well below the 30 year average of closer to 300 degree days by the middle of April.  The warming trend this week should speed things up.  We expect the......
]]> Tue, 17 Apr 2012 16:02:27 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7278&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7278 Background: Many of you have heard, that huanglongbing was found in a tree in a yard in Hacienda Heights in southern California.  The disease was found by collecting live Asian citrus psyllids at a trap location into alcohol and testing them for the pathogen.  When infected psyllids were found for this location, all the trees in that site were tested, and one came up positive for the disease.  The tree was a lemon topworked with pummelo and it was the pummelo that was infected.  State and......
]]> Mon, 09 Apr 2012 08:15:21 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7220&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=7220 Introducing the newly updated IPM for Citrus—3rd Edition. Now with even more photos, more resources, and more pests! Learn to apply the principles of integrated pest management to identify and manage more than 150 common citrus pests, diseases, and disorders. Look for brand new sections on Asian Citrus Psyllid, Citrus Leafminer, Glassy-Winged Sharpshooter and more!  Important information on physical disorders, production problems and harvest related problems is also covered. This manual of......
]]> Fri, 24 Feb 2012 13:49:57 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6889&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6889 My crew and I have joined the Citrus Research Board in an outdoor area (L36) at the World Ag Expo this year.  We have the mobile lab set up to display California red scale, earwigs, Asian citrus psyllid, diaprepes root weevil, citrus leafminer, soft scales, and scarring damage.  Please join us to chat about citrus pests on Thursday. ...
]]> Wed, 15 Feb 2012 16:48:06 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6836&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6836 Sadly, huanglongbing (HLB or citrus greening) was discovered in a tree in a commercial orange grove south of San Juan, in the Rio Grande valley of Texas just a few short miles from the Mexico border.  Quarantines have been set up and treatments for psyllids are underway. For the news report see: http://www.physorg.com/news/2012-01-texas-experts-citrus-greening-disease.html.  This is a reminder to be on the alert for leaf symptoms in California....
]]> Sat, 21 Jan 2012 08:22:29 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6655&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6655 The Los Angeles urban infestation of Asian citrus psyllid has reached such a large size that it is no longer being treated with insecticides by the California Department of Food and Agriculture.  The psyllid has spread eastward into Riverside and San Bernadino counties and is affecting some commercial citrus there.  It is likely to spread westward into commercial citrus in Ventura and northward into the San Joaquin Valley this year.I have added a page to my web site......
]]> Mon, 09 Jan 2012 12:12:04 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6553&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6553 The cold weather in combination with citrus leafminer damage is causing new flush to turn brown.  This mandarin block at LREC has been flushing continously and has been attacked by citrus leafminers for many months. The leafminers will now stop growing and hunker down till winter is over (finally!).  We are happy to see that population finally declining....
]]> Fri, 16 Dec 2011 15:55:04 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6425&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6425 Friday Dec 9, from 10 am-1 pm is the Lindcove fruit display and tasting.  In addition Mary Lu Arpaia and David Obenland will have a sensory tasting booth to collect data on your preferences and Tracy Kahn will conduct a walking tour of the citrus variety demonstration block.  Farm Advisors Craig Kallsen and Neil O'Connell will be present to answer questions and Mikeal Roose will be available to discuss new low-seeded varieties developed by his program.  If for some reason you can not attend......
]]> Mon, 05 Dec 2011 10:18:56 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6316&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6316 Free and interactive online courses are available for ctirus pests at the UC ANR online learning site http:class.ucanr.org.  Each of the six modules takes about an hour to complete.  If you pass the quiz with at least a score of 70% then you earn 1 continuing education credit for each module.  Check them out!...
]]> Fri, 18 Nov 2011 10:14:24 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6223&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=6223 We have been treating citrus seedlings and releasing Fuller rose beetles adults onto them to see which insecticides might be effective in killing them.  We are not seeing a lot of mortality.  For some insecticides, rather than die, they avoid feeding on the treated foliage and they can live a long time without feeding.  More details to come when we have the data analyzed...........
]]> Fri, 14 Oct 2011 13:32:15 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5968&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5968 During the past few months we have been testing adult female earwigs with various insecticides using a petri dish bioassay method.  We are finding that very few insecticides kill them quickly and completely: Lorsban Advanced and Danitol worked the best.  There is a spinosad bait called Seduce that is very effective in the laboratory but did not work in a field trial because the earwigs were up in the trees and did not feed on it.  We are continuing to study this product to find out when and how......
]]> Mon, 03 Oct 2011 11:04:58 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5893&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5893 While surveying a site for Fuller rose beetle, we observed a number of dead beetles with their heads broken off.  We were wondering what might be predating on them, and I caught this spider in the act.  I was disappointed that I did not get a photo of the spider feeding (it dropped the beetle when it saw me), but I did see the spider with its mouth inside the body of the beetle.  The mystery is solved!  Its good to know that something is working on the beetle population....
]]> Thu, 18 Aug 2011 07:31:54 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5552&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5552 Fuller rose beetles are a primarily a problem because they lay eggs under the calyx of fruit and those fruit can be rejected when exported, because some export countries don't want this pest to establish in their region.  Fuller rose beetle can also cause significant leaf damage to newly topworked orchards.  We have been sampling an orchard near Lindcove and, while a few beetles emerge year round, we are seeing heavier numbers emerging as of the first week of August.  You can find Fuller rose......
]]> Tue, 09 Aug 2011 08:55:06 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5478&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5478 The Kearney and Lindcove Entomology research teams are studying the impact of earwigs on mature and young citrus trees this year.  We have evaluated damage of young trees, conducted both field and laboratory pesticide screening and are beginning to study earwig lifecycles in mature citrus.  We invite you to join us at Lindcove on July 27 at 9 am to hear about the results of the work we have conducted so far. See the event calendar page for more information....
]]> Fri, 08 Jul 2011 10:45:42 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5284&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5284 Degree days indicate that the 3rd flight of citrus peelminer will occur the last week of June.  The Lindcove entomology crew has been monitoring pummelos this week and found a few small mines confirming that the 3rd flight is starting.  If you have pummelo or grapefruit varieties that have had infestations of citrus peelminer, you should treat now to prevent moths from depositing eggs and/or eggs from hatching into larvae....
]]> Thu, 23 Jun 2011 07:32:16 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5185&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=5185 Citricola scale crawlers have been hatching and emerging for several weeks.  Now the California red scale crawlers are joining them.  Red scale crawlers begin to emerge at 550 degree days.  Our degree day web site http://ucanr.org/sites/KACCitrusEntomology/Home/California_Red_Scale/Degree_Days_885/ indicates that Tulare county has accumulated 571 degree day units. We use double sticky tape wrapped around twigs with female red scales to catch crawlers and confirm that emergence is matching up......
]]> Fri, 27 May 2011 14:28:07 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4965&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4965 The San Joaquin Valley is about 80 degree days behind the 30 year average.  For California red scale, we expect to see crawler activity when degree days reach 550 (with a lower developmental threshold of 53oF).  Even Kern County, where the temperatures are warmest, has only accumulated 460 DD.  Depending on weather, it will be about another 7-10 days before the crawlers begin to emerge in that region and even later as you move northward towards Madera. Double sticky tape around a twig next to a......
]]> Tue, 10 May 2011 09:22:26 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4832&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4832 If you look at the current degree days for California red scale in the Lindcove area, we are about 125 degree days behind the 30 year average.  In that region, we are accumulating about 10 DD per day and so we are about 2 weeks later than 'normal'.  Be sure to follow degree day units either using the web site or your own temperature units to determine the best time to spray (for most insecticides, 550 degree days after the 1st or 2nd male flights). ...
]]> Mon, 02 May 2011 09:12:53 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4763&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4763 I recently started getting serious about studying earwigs in San Joaquin Valley citrus.  It seems my timing is great (well, great for research anyway), because there are very high numbers in young tree wraps right now (April).   The general cycle for earwigs is they overwinter as adults, lay eggs, eggs hatch and nymphs mature, then right about now they move up into the trees.  Earwigs can clearly damage young tree flush.  We are screening pesticides to develop a treatment program for young......
]]> Fri, 15 Apr 2011 17:09:56 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4639&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4639 Thu, 24 Mar 2011 13:18:20 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4465&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4465 Thu, 17 Mar 2011 10:52:37 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4412&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=4412 Wed, 24 Nov 2010 07:24:02 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3834&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3834 Mon, 15 Nov 2010 10:03:33 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3787&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3787 Fri, 05 Nov 2010 10:38:41 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3738&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=3738 Wed, 09 Jun 2010 16:51:46 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=2906&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=2906 Wed, 02 Jun 2010 10:22:29 PST http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=2867&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed eegraftoncardwell@ucanr.edu(Elizabeth Grafton-Cardwell) http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=2867