A portion of Placer County has been placed under quarantine for Asian citrus psyllid (ACP) following the detection of multiple life stages on citrus trees within the City of Lincoln.
The quarantine zone in Placer County measures 118 square miles, bordered on the north by Riosa Road; on the south by the Roseville City Limit; on the west by Brewer Road; and on the east by Fowler Road. The quarantine map for Placer County is available online at: https://www.cdfa.ca.gov/plant/acp/regulation.html#maps. Please check this link for future quarantine expansions in this county, should they occur. Quarantines in new counties will be announced separately.
This is a case where an individual moved infested trees from a quarantine zone into a clean county and ended up moving psyllid with the trees. This is how so many of our current pests are moving around - Shot Hole Borer, 1000 Cankers of Walnut, Emerald Borer, Gold Spotted Borer. On and on, we are the culprits of our own destruction. Pretty soon every pest known to plants will be everywhere. Sorry for the rant.
The drought has caused numerous conditions – physiological and pathological – that I have only seen in text books (see our newsletter article: http://ceventura.ucanr.edu/newsletters/Topics_in_Subtropics63007.pdf). But other phenomena are also occurring. Recently I saw a field of blackberries in full bloom and the other day a grower called in about a plum tree that was also in full bloom. What is going on? This is supposed to happen late winter/early spring. It turns out that often drought stress can supplant winter chill in some plant species. In this case, these two species are relatively low chill, meaning they don't require a lot of cold to break winter bud dormancy. The drought stress causes the buds to break dormancy.
This is similar to the “Verdelli” effect in lemons. This is a technique used to shift the period of optimum fruit production to a more profitable period, usually the summer when more lemons are used. In the case of plum and blackberry and other low chill deciduous tree crops, this would be pushing production into the coldest period of the year. It might work along the coast, but in the Central Valley it would probably just mean frozen fruit. But it's a possible method that we might play with.
Photo: October, 2016
- Author: Cheryl Reynolds
UC Statewide Integrated Pest Management Program
The California Department of Pesticide Regulation (DPR) runs the most extensive Pesticide Residue Monitoring Program in the nation and is hard at work ensuring that the fruit and vegetables we purchase and consume are free from illegal pesticide residues. Just last month, DPR detected residues of a pesticide not registered for use on grapes and fined the grower $10,000 for using a pesticide in violation of the label and for packing and attempting to sell the tainted produce.
Cases like this are rare in California but remind growers how important it is to apply pesticides correctly by following all pesticide label directions. Understanding and following label instructions is the focus of a new online course developed by the University of California Agriculture and Natural Resources Statewide Integrated Pest Management Program (UC IPM).
Proper Pesticide Use to Avoid Illegal Residues is targeted to those who apply pesticides or make pesticide recommendations. It explains what pesticide residues are, how they are monitored, and highlights important residue-related information from several sections of pesticide labels. In addition, the course identifies the following as the most important factors leading to illegal residues:
Using a pesticide on a crop or against a pest for which it is not registered
Applying pesticides at an incorrect rate
Ignoring preharvest intervals, re-treatment intervals, or plantback restrictions
Course participants are presented with several real-life scenarios. They must search through actual pesticide labels to determine if the scenario illustrates proper use of pesticides or if the described situation could potentially lead to illegal residues.
The overall goal of this course is to have participants follow pesticide label instructions when they return to the field. Following the label can eliminate incidences of illegal pesticide use.
Proper Pesticide Use to Avoid Illegal Residues is published just in time for pest control advisers and pesticide applicators who are still a few units short to renew their licenses or certificates with DPR. The course has been approved for 2 hours of Pesticide Laws and Regulations continuing education units (CEUs) from DPR and costs $40. If you don't need CEUs, but are still interested in viewing the course content, check it out for free on YouTube.
DPR recommends that renewal packets be submitted before November 1 in order to receive your renewed license or certificate by December 31, as the processing time can take up to 60 days. For additional online courses that UC IPM offers, visit the online training page.
It just came to my attention that there is a map of all the oil pipelines in the US. If you go to the bottom/left side and put in the state and county, it will be revealed. This is mainly for those growers who need to be aware of pipelines and tillage or any other work in the aerea of a pipeline.
- Author: Brad Hanson
Several years ago, I had what seemed like a great weed research idea.
My idea addressed a serious agricultural weed problem in California, it was applicable to several cropping systems, it used an integrated approach to weed management, and it utilized a pretty novel approach (or so I thought). I proudly laid out this idea to my UC weed science colleague at a meeting, only to hear "That's great Brad but I think your predecessor tried that in the late 80's and it didn't work very well". After my damaged pride recovered a bit, I started thinking about the volume of research that we do that is not very easy to find out about after it is done.
As scientists, we often think about publications in terms of the work we publish in various peer-reviewed journals. These are very important but only encompass a portion of the written reports on our research. There's a whole other category of the "gray literature" that is not easily accessed or searched, but often makes up a substantial part of our extension programs or base knowledge. This includes research progress reports to commodity commissions and funding agencies, herbicide screening trials, the one-off side projects, that grad student research that wasn't ultimately published in a journal for one reason or another, the write-up prepared for an extension meeting, the pilot study that didn't generate sufficiently interesting results to follow up on, etc.
Some of this information can be accessed on online (if you look in the right place), but other than the person who created the report, much of this information is essentially lost once the report has been submitted or the presentation made. Worse yet, some research results simply aren't available anywhere but in the writers file cabinet or hard drive and can completely disappear with a computer replacement,office cleansing, or researcher retirement. Our colleagues, students, and successors (and even ourselves) cannot build upon research they don't know about (or don't remember doing).
So, to take a stab at this problem, several Weed Research and Information Center colleagues and I started building a UC Weed Science Report Database. We used an existing database platform in the UC ANR system but built a web interface with a simple search function for key words, authors, publication year, or several broad categories of reports. We elected to use an "all word search" rather than to manually categorize each report by weed/crop/herbicides, trade names vs chemical names, etc.
Although far from being a complete set of reports (that is probably an impossible goal), there are currently nearly 1700 reports, publications, research posters, and CWSS abstracts that have been uploaded so far. Our goal is to keep adding to these reports on a regular basis into the future. Where possible, we're also trying to include reports from the archives as we obtain and scan them.
I have to acknowledge the UC ANR programmers who helped answer dozens of my database questions and for programming the upload and search functions. Also, the California Weed Science Society provided some support for the scanning and uploading of several decades of CWSS proceedings that have been included in this project and will also be available at the CWSS website in whole volume format.
The database is available at this link or directly at this web address:
Please take a look if you have interest. As this project is still very much "in process", please share any comments or suggestions via the comments below.