- Author: Cheryl Reynolds
Spider mites, fruit moth and twig borer larvae, aphids, and bark cankers are just a few pests that can wreak havoc on stone fruit trees. With spring well underway and trees in full bloom and beginning to develop fruit, it's time to monitor and take action before these pests get out of hand.
UC IPM teamed up with UC farm advisors to develop a series of how-to videos that can help growers and pest control advisers monitor for pests and damage and determine if and when treatment is needed.
In one video, Sacramento Area IPM Advisor Emily Symmes gives a brief overview of how to monitor for webspinning spider mites. Spider mites build up in stone fruit trees as the weather warms up. Late spring through summer is the ideal time to monitor for mites and their damage, which includes leaf stippling and webbing. If mites build up too much, leaves can drop, fruit may not fully develop, and branches and fruit can be exposed to sunburn.
Shoot strikes, or dead drooping leaf tips, are often seen on young peach and nectarine trees. In a second video, UC Sutter and Yuba County Farm Advisor Janine Hasey explains how to monitor for shoot strikes and how to distinguish the culprits, oriental fruit moth and peach twig borer. Although Oriental fruit moth and peach twig borer can bore into both foliage and fruit, they cause the most devastating damage by feeding on fruit. Early season monitoring and treatment can prevent future fruit loss.
In plum and prune orchards, leaf curl aphids and mealy plum aphids cause leaves to curl and become distorted. Aphids produce honeydew, which can lead to the development of sooty mold, causing fruit to crack and blacken. Aphids are often present when leaves start to grow. In his video, Rick Buchner, UC farm advisor for Tehama County, discusses how to monitor for aphids and explains how to decide when treatment is warranted.
In a final video, UC Sacramento County Farm Advisor Chuck Ingels teaches how to distinguish Phytophthora root and crown rot from bacterial canker. The two diseases are often confused because they both cause bark cankers. Phytophthora root and crown rot is confined to the lower trunk, but when a bacterial canker infection occurs in the tree trunk, the diseases can often be confused. Bacterial canker can be confirmed by cutting away the outer bark and looking for characteristic red flecks on the inner bark. Correct identification of these diseases will help in choosing a management strategy.
Jennifer Randall, Research Associate Professor in the Department of Entomology, Plant Pathology and Weed Science at New Mexico State University provided a presentation on “Pistachio Bushy Top Syndrome: Disease etiology and diagnosis procedures" on April 7, 2015 at Kearney Agricultural Research and Extension Center (KARE).
The presentation was followed by a Q&A session conducted by Randall; Florent Trouillas, Assistant Cooperative Extension Specialist at KARE and in the Department of Plant Pathology at UC Davis specializing in fruit and nut crops; Craig Kallsen, UC Cooperative Extension advisor in Kern County, specializing in citrus, subtropical horticulture and pistachios; Robert Beede, UC Cooperative Extension advisor, emeritus, in Kings County, specializing in horticulture: tree fruit, nuts and grapes; and Elizabeth Fichtner, UC Cooperative Extension advisor in Tulare County, specializing in orchard systems.
Background: In the last few years, a new disease affecting UCB1 rootstocks emerged in CA, AZ, and NM. This disease was named Pistachio Bushy Top Syndrome (PBTS). Scientific evidence in 2014 demonstrated that PBTS is caused by the bacterium, Rhodococcus fascians (Rf). The percentage of rootstock exhibiting symptoms varies widely among plantings. At least 20,000 acres in CA have been affected to some extent. Two strains of Rf have been identified. Each is pathogenic, and they act synergistically to cause more severe disease symptoms. Pistachio growers in CA need to test for the pathogen in their newly planted orchards. This workshop attempted to bring academic, private and governmental diagnosis labs up to date on this new disease. Dr. Jennifer Randall from NMSU presented her group's latest research on the disease biology and detection methodologies.
- Author: Ana Toste
UC ANR Lindcove Research and Extension Center will provide an opportunity for the public to learn more about citrus varieties on March 20, 2015, from 1-3 PM. Visitors will be able to tour the demonstration orchard that contains nearly 200 of the most common varieties of citrus. Attendees can view tree growth characteristics, ask questions about varieties, and taste the fruit.
Ana Toste: 559-592-2408 ext 151
22963 Carson Ave., Exeter, CA 93221
Once you arrive at LREC, follow the signs to the parking area.
- Author: Sean Hogan
The UC ANR Informatics and GIS (IGIS) program is offering two new agriculturally focused GIS and mobile data collection workshops at the Kearney Agricultural Research and Extension Center, on March 19th and 20th. If you have any interest in contemporary applications of GIS or mobile data collection for agricultural use, these workshops may be for you. The workshops run from 11 to 4 pm and include lunch. They are open to ANR affiliates for $30 and non-ANR public for $60.
The first workshop, on March 19th, will include a one hour lecture on practical applications of GIS for crop agricultural, followed by a three hour exercise that will explore practical techniques for analyzing and mapping local agricultural concerns with readily available software and online data. The second workshop, on March 20th, will also start with a one hour lecture and will be followed by a three hour practical exercise, which together will explore the development of customized mobile SmartPhones GPS apps, applications of GPS and mobile data collection for agriculture, and practical ways of viewing and sharing your data. For more information regarding the workshops please go to: http://igis.ucanr.edu/IGISTraining/GISforCropAgKARE/ and http://igis.ucanr.edu/IGISTraining/GPSworkshopKARE/
Note - Both of these workshops are designed for participants with little to no GIS or GPS experience. However, more advanced GIS and GPS users are equally welcome, and may likewise find these workshops to be quite beneficial due to their practicality.
- Author: Laura J. Van der Staay
UC ANR Kearney Agricultural Research and Extension Center is providing fun learning opportunities to Fresno Unified School District 4th grade students and W.E.B. DuBois & Carter G. Woodson Public Charter Schools' students.
The teachers get lesson plans on experimental design and integrated pest management strategies prior to the students coming for their field trip. Each field trip has a tour where students learn about different crops, issues, and experimental designs. After the field trip, the students learn about how UC helps people and the environment. They are also exposed to “the more you learn, the more you earn” concept and given examples of great local STEM related career opportunities.
Elementary students finish their visit with role playing scenarios that demonstrate the importance of integrated pest management strategies, as well as why pesticide runoff should be prevented.
High school students finish their visit with more advanced experimental activities including a tour of the post-harvest lab and hands-on study of fruit samples using refractometer, penetrometer, and sensory evaluation techniques.