http://ucanr.org/blogs/SalinasValleyAgriculture/?utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed Highlighting agricultural developments, problems, research, & issues for central coast CA en-us UC ANR http://cyber.law.harvard.edu/rss/ Mon, 23 Apr 2012 08:54:03 PST Mon, 23 Apr 2012 08:54:03 PST UC ANR Beginning in early April, 2012, the UC Cooperative Extension diagnostic lab in Salinas began to receive lettuce samples exhibiting obvious symptoms of a virus problem. Samples continued to be submitted throughout the month. All samples tested positive for the thrips-vectored Impatiens necrotic spot virus (INSV). This virus first began to cause damage to California lettuce in 2006. Since that time, INSV has occurred to a greater or lesser degree every season. However, significant INSV outbreaks...
]]> Fri, 20 Apr 2012 09:30:23 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7309&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed stkoike@ucdavis.edu(Steven T. Koike) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7309 Click here for a pdf
]]> Mon, 16 Apr 2012 15:08:54 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7269&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7269 Weather and lettuce diseases. Late spring rains, cold temperatures, and high humidity are making it possible for two important foliar diseases of lettuce to show up in California and cause damage in 2012. Both bacterial leaf spot and anthracnose have been observed in numerous fields throughout the central coast. If rains continue or if the crop is irrigated with sprinklers, both diseases can result in significant damage to lettuce leaves and resulting loss of yields due to poor quality of the...
]]> Tue, 10 Apr 2012 14:01:41 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7231&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed stkoike@ucdavis.edu(Steven T. Koike) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7231 A video entitled, "Alternative Cultivators for Organic Vegetable Production" is now available on YouTube. The video was produced by Aaron Heinrich and Richard Smith and presents information on new developments in automated weed control technology and research information on blind cultivators such as torsion and finger weeders. The video can be accessed at: http://www.youtube.com/watch?v=I4kzebMG6rEFor more information on alternative cultivation see the blog below. Also, go...
]]> Fri, 23 Mar 2012 16:45:52 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7106&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed rifsmith@ucdavis.edu(Richard Smith) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7106 ]]> Fri, 23 Mar 2012 16:24:06 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7105&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed rifsmith@ucdavis.edu(Richard Smith) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7105 The lack of rain in the Salinas Valley brings many concerns. The lack of runoff into lakes San Antonio and Nacimiento of course is a concern for the availability of water to run down the river to recharge the ground water for irrigation purposes. In addition, the lack of rain will affect the levels of salts that remain up in the root zone of the crops. Soil nitrate (NO3-) is one of the anions that will remain in the soil if leaching by winter rains does not occur. Nitrate is highly mobile and...
]]> Fri, 23 Mar 2012 15:00:41 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7102&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed rifsmith@ucdavis.edu(Richard Smith) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=7102 ]]> Thu, 01 Mar 2012 21:39:44 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6934&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mdcahn@ucdavis.edu(Michael D Cahn) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6934 ]]> Mon, 27 Feb 2012 10:12:02 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6899&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6899 ]]> Wed, 25 Jan 2012 16:26:54 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6676&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6676 ]]> Fri, 21 Oct 2011 15:45:31 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6029&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=6029 Tipburn of lettuce is a calcium-related disorder which causes the development of necrotic areas on the inner leaves of romaine and other leaf lettuce and on enclosed leaves of head lettuce (Photo 1). The necrotic areas likely develop due to a localized calcium deficiency that causes tissue collapse of the affected cells. There are two key factors that affect the development of localized calcium deficiency: 1) uptake of adequate calcium from the soil, and 2) calcium transport through the...
]]> Thu, 25 Aug 2011 09:45:49 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5608&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5608 Another new race, the 13th, of the downy mildew pathogen (Peronospora farinosa f. sp. spinaciae) of spinach has been found and documented. First identified in January 2010 from spinach in Holtville, California, this race breaks the resistance of several important cultivars. The isolate was initially designated as UA0510C and was characterized with a standard set of differential varieties. Isolates apparently identical to UA0510C have been found in an increasing number of locations throughout...
]]> Fri, 05 Aug 2011 08:11:20 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5441&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5441 Speck on coastal tomato. In summer (May through July) 2011, bacterial speck disease of tomato is commonly found in a number of fields in coastal tomato-growing areas in Santa Clara and Monterey counties. No doubt the periodic and prolonged rains earlier this year are a major factor in this unusual development. Symptoms consist of dark brown to almost black spots on leaves and sometimes stems. Leaf spots can be circular or angular in shape and individual spots are generally smaller than ¼ inch...
]]> Tue, 19 Jul 2011 14:16:38 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5334&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5334 The unusually cold, wet, and rainy weather during March through June 2011 has created conditions that favor the development of Botrytis crown rot of lettuce in several counties in coastal California. Botrytis crown rot, also known as gray mold, has resulted in stand loss and reduced yields in numerous fields. Transplanted lettuce: Crown tissue on transplants in the field becomes brown to orange-brown in color and soft. The characteristic fuzzy gray sporulation of the pathogen is usually...
]]> Wed, 22 Jun 2011 13:50:08 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5177&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=5177 In recent weeks a number of samples have come into our office of lettuce plants that have the following symptoms: stunting, yellowing outer leaves and occasionally with wilting during the afternoon (Photo 1).  The symptoms superficially resemble Lettuce Dieback caused by Tomato Bushy Stunt Virus, but Steve Koike has not detected this virus in these plants.  Affected plants also typically have roots that are no longer than 1.5 to 2.0 inches long (Photo 2). Upon careful examination of the root...
]]> Tue, 24 May 2011 12:20:35 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4931&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4931 During the month of April 2011 in coastal California, a number of growers and PCAs are seeing wilting and stunting of young lettuce plants. Affected lettuce typically range in size from the 4-to-6 true leaf through rosette stages and are randomly distributed throughout the field as individually affected plants. Such plants initially fall behind in development and may appear slightly stunted. As the problem worsens, these plants will start to wilt during the day. Eventually the older leaves may...
]]> Tue, 26 Apr 2011 12:00:49 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4719&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4719 Article submitted by: Carolee Bull, USDA Research Plant Pathologist Steven Koike, Plant Pathology Farm Advisor   Since 2002, a severe leaf spot disease on parsley has occurred throughout central coastal California and particularly in Monterey County. Three different bacterial pathogens (Pseudomonas syringae pv. apii, P. syringae pv. coriandricola and an organism very closely related to P. viridiflava) have been associated with these outbreaks on parsley. Of interest to researchers and of...
]]> Tue, 05 Apr 2011 09:43:37 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4519&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4519 Article submitted by:Richard Smith, Vegetable Crop and Weed Science Farm Advisor There is increased interest in the use of the nitrate quick test for managing fertilizer decisions in vegetable production. In this Blog, I will go over some details on obtaining a good representative sample in order to conduct the quick test analysis.  Normally soil cores are taken down to 12 inches for lettuce and cole crops; however, for shallow rooted crops such as spinach and baby lettuce, soil cores to 6...
]]> Thu, 17 Mar 2011 09:02:32 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4406&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4406 Submitted by:Jim Correll, University of ArkansasSteven Koike, University of California Cooperative ExtensionYet another new race of downy mildew (Peronospora farinosa f. sp. spinaciae) on spinach has been identified in California’s Salinas Valley. The type, or original, strain was initially designated as UA2209 and was first detected in May 2009. Subsequently, it was found in an increasing number of locations throughout California in 2009 and 2010. This race breaks the resistance of several...
]]> Thu, 03 Mar 2011 08:32:50 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4323&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4323 ]]> Fri, 25 Feb 2011 10:17:22 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4301&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed larriaga@ucdavis.edu(Lennis Arriaga) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=4301