Episode Transcript
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SPEAKER_02 (00:00):
Hello and welcome to
Thoughts on Rice, a podcast
hosted by the University ofCalifornia Cooperative Extension
Rice Advisors.
I'm one of your hosts, SarahMarchionish, and I'm a rice farm
(00:22):
advisor for Colusa and Yolocounties.
SPEAKER_00 (00:26):
I'm Whitney from The
Forest.
I'm the Cooperative ExtensionRice Advisor for Sutter, Yuba,
Placer, and Sacramento counties.
SPEAKER_01 (00:33):
My name is Luis
Espino.
I'm the Rice Farming SystemsAdvisor for Butte and Glynn
counties.
I'm Michelle Leinfelder-Miles.
I'm a farm advisor in the Deltaregion.
I work on all sorts of fieldcrops, grains and forages, but
one of those is rice.
And the counties that I coverare San Joaquin, Sacramento,
(00:55):
Yolo Solano, and Contra Costacounties.
SPEAKER_02 (00:58):
Together, the UCC
rice farm advisors seek to
provide relevant, topical,research-backed information
relating to California riceproduction.
Today we'll be continuing on abit of a theme.
in a way, continuing on from ourprevious podcast episode, which
(01:21):
was with Billy Abbott talkingabout the bird conservation
programs that are upcoming thiswinter.
Now, today we'll also still betalking about birds, but kind of
in a different vein.
Today we're going to talk aboutblackbird damage in rice.
And in case you're not familiarwith it, blackbirds and rice are
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typically not a greatcombination.
This episode is modified from ablog post Stay tuned to hear
more about blackbirds in rice.
(02:11):
Now, in the last few weeks,we've seen a lot of rice
starting to head out, especiallyour earlier rice varieties.
I got called out to an earlyrice variety, Keto Komachi,
which was starting to head out.
And the growers had seen somekind of damage in the field.
And it was something they hadseen at a level that to them was
(02:32):
pretty unacceptable.
So they called me out to get asecond opinion about what was
happening.
Now, essentially, what they,their PCA, and I kind of all
agreed on was that yeah, theywere getting some pretty heavy
pressure from blackbirds.
And so kind of to that end, Iwanted to spend some time today
talking about what blackbirddamage looks like in rice
fields.
(02:52):
However, I also understand thatit's kind of difficult to do
something like that withoutpictures.
And since YouTube doesn'tacknowledge that I'm a real
person, we're not able to set upour YouTube channel just quite
yet.
So I'm going to talk you throughthis.
But if you're interested inseeing more information, my blog
post has a lot of pictures andmore information if you're
looking to see an actual visualrepresentation about what we're
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talking about here.
This is a pretty distinctivebird song, and it's indicative
of the male red-wingedblackbird.
It's a pretty familiar sound tothose of us who work in
California's Central Valley.
(03:36):
Now in California, theblackbirds that we are talking
about are primarily red-wingedblackbirds.
And these birds can damage ricefrom planting season, seedling
stage, and the ripening period.
However, where the majority ofour rice is water seeded,
typically damage is limited tothe ripening stage.
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At this point, blackbirds canharm the rice crop in a variety
of ways.
They can pinch the rice kernels,which just means squeezing each
grain of rice with the beak toforce milky contents into the
mouth at the milk stage.
They can hold the grains and eatthem in the grain stage.
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And they can actually physicallybreak the panicles by perching
and feeding throughout theripening period.
So there's lots of differentways that blackbirds can
physically injure the rice.
Now, it's difficult to estimatethe economic losses from
blackbirds in rice fields.
We don't really have thatinformation because it's
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extraordinarily difficult totrack how much damage is due
entirely to blackbirds.
However, across the entireUnited States, overall blackbird
damage to rice crops has beenestimated to be greater than$20
million.
And that$20 million does notinclude the money that's spent
(04:57):
on damage abatement efforts.
So what that means, damageabatement efforts, that's the
birds away from the sites,trying to avoid or abate the
damage that these birds mightcause.
Losses can be high in cropfields that are close to
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important or historic roostingareas.
And in California, especially inthe areas where our race is
grown, fields that borderroosting habitat, which include
sloughs, tules, bamboo stands,willows, etc., might be subject
to increased depredation.
Early heading rice fields,especially those that are
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surrounded by fields that mayhead out later, may be more
susceptible to high levels ofblackbird infestations.
And it's not because thatvariety is tastier or more
preferential to the birds.
It's just more of a fact ofavailability.
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The birds will see a fieldthat's starting to head out and
immediately go towards itbecause it's essentially the
only open quote unquoterestaurant in the area.
And so they will all congregateat the available food source
instead of disseminating throughthe region.
And since there's a highconcentration of birds at a
single solitary field, thedamage becomes much more
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apparent.
As far as management ofblackbirds goes the most common
method is to use frightening orhazing techniques.
However as I'm sure any personhere could tell you these
techniques offer mixed resultsat best.
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Growers have used anywhere frompropane guns, which are also
called zon guns, bird tape ormylar tape, and other sound and
visual scare devices.
There's actually some reallyinteresting work in some regions
where people are using drones toattempt to frighten pest birds.
And then in other areas, peopleare trying to use lasers in a
(07:07):
form of laser scarecrows inorder to attempt to reduce the
damage affected by these birds.
And I'll include links to thesein the show notes.
However, birds are really smart,and so the birds can actually
become habituated to thesedisturbances as they notice over
time that, okay, yeah, it mightbe a loud noise, but there's
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nothing actually harming me.
So these techniques can have, atbest, mostly just short-term
effectiveness.
In order to be effective, hazingtechniques have to be
implemented as soon as birdsappear in the too late and the
birds will just becomehabituated and have almost no
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reaction to them.
An option I've seen in some ofour fields around here is people
will get some inflatable tubeman, kind of like the big
inflatable floppy guys you seeoutside of car dealerships.
Those also have mixed results,but they're pretty cool to see
out there on the side of theroad.
When it comes to the protectionsthat birds have in the United
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States, it gets a littlecomplicated, depending on which
blackbird species you're talkingabout.
As a group, blackbirds have someprotections under the Migratory
Bird Treaty Act.
However, through a federaldepredation order, which is 50
CFR 21.43, which was issued bythe U.S.
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Fish and Wildlife Service,people are authorized to
lethally take some blackbirdspecies when they're federal
permit.
So under this order, thered-winged blackbird is allowed
to be lethally taken.
And here again is that call ofthe red-winged blackbird.
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However, there's another speciesthat's pretty localized to the
California Central Valley, andthat species is the tricolored
blackbird.
(09:38):
And again, this is an audiomedium, so it's going to be hard
to tell the differences.
But again, you can go and lookat photos of these on our blog
post, which will be linked inthe show notes.
Essentially, the red-wingedblackbird and the tricolored
blackbird look extremelysimilar.
Breeding male tricoloredblackbirds have a distinctive
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red shoulder patch bordered by awhite band below that red patch,
whereas breeding male red-blackbirds have a shorter bill
with a yellow stripe below thereddish-orange patch.
However, I'm looking at apicture of these two birds side
by side right now, and it'spretty difficult to tell the
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differences between them.
When it comes to the females,there's a little bit more of a
distinction between the two ofthem.
The female tricolored blackbirdhas a thicker body with a
slender pointed bill, darkgray-brown overall with dark
dark streaks on the back andbelly, and most notably, a pale
eyebrow.
(10:44):
Whereas the female red-wingedblackbird is stocky, more of a
broad-shouldered bird with aconical bill, and a yellowish
wash around the face.
I'd like to note here, I didn'tknow this until I started
researching this, but femalered-winged blackbirds in
California often have a morecinnamon tone to their color, so
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they might look a little morereddish.
So why are we talking about thedifferences between these birds?
Essentially, because these birdslook so similar, the tricolored
blackbird and the red-wingedblackbird, even though it is
allowable to lethally take thered-winged blackbird, it's
really easy to get that confusedwith a tricolored blackbird.
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And those are protected andcannot be taken.
And so if you are going tolethally take blackbirds that
are causing damage, you've gotto be really certain you've got
the right species.
In addition to that, it's arequirement that non-lethal
methods to reduce damage byprotected blackbirds must be
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tried each year before usinglethal controls, and state laws
should also be checked beforeacting.
Now, when it comes to birdspecies not listed in the
depredation order, and again,that's the order that allows for
taking of the red-wingedblackbird, a migratory bird
depredation permit must beobtained from Fish and Wildlife
Services, and state law shouldbe consulted and adhered to
(12:13):
prior to initiating actions toremove birds.
For the most up-to-dateinformation regarding the taking
of birds of any type, consultingyour local ag commissioner
should have the most up-to-dateinformation.
Now, in the Mid-South region,LSU AgCenter research that was
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funded by the Louisiana RiceFarmers Checkoff actually led to
federal approval of a birdrepellent called AV-1011 that
prevented birds from eating therice seed once it's planted.
And so essentially what this is,is this is a seed treatment that
coats the seed in a reallybitter flavor which then teaches
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the birds not to eat the riceseeds after they're planted
because it tastes so bad.
However, in California, we don'thave as many options.
While there haven't been anyrecent studies looking at the
impact of repellents onCalifornia rice fields in terms
of blackbirds, the CaliforniaRice Production Manual does
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state that to date, repellentshave not proven to be effective
in reducing blackbird damage torice in California.
And that statement can be foundin section 10.2 in the Rice
Production Manual.
When I started researching whatrepellents could be used in
California rice, the answer wasa lot less straightforward than
you might assume, because whenyou type in bird repellents
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registered for use in Californiarice, not a lot pops up that's
applicable.
Most of the research you see isbased out of the Mid-South,
which, as we all know, hasdifferent restrictions and
regulations than we do out herein the West.
Couple that with the fact thatCalifornia wild rice does have
products registered for use asbird repellents, but these
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products are not alwaysregistered for use in California
rice, which is a pretty bigdistinction.
Now, there is a chemical calledmethyl anthranilate, and it's
sold under a variety ofdifferent chemical names.
But essentially, a lot of thelabels that I went through have
it only labeled for use inCalifornia wild rice.
(14:25):
However, when I went and lookedeven further into just the use
of repellents in general most ofthe data does appear to say that
repellents are at best onlymildly effective and usually not
that effective and therecommendation is actually that
hazing is more effective than achemical repellent really is.
So I'm going to keep lookinginto this if we can find any
(14:48):
more information I'm going tomaybe post an addendum maybe add
something onto a blog post butas of right now I think I think
we can just leave this with, ifyou've got blackbirds, your best
option is to keep an eye out,make sure that you see exactly
when the birds start to show upin the fields, and then start
using hazing techniques.
(15:28):
We have a few upcoming events.
The next upcoming event will bethe annual Rice Field Day, which
will take place as always on thelast Wednesday of August on
August 27, 2025 at the RiceExperiment Station at 955 Butte
City Highway in Biggs,California.
(15:49):
This will feature talks frombreeders, talks from our UC Rice
specialists and advisors, and adelicious lunch.
For more information about theseand other upcoming events, feel
free to check out our resources,which include the UC Rice blog
and the UC Agronomy Ricewebsite.
In terms of other resources youmight want to take advantage of,
(16:12):
you can also look at ournewsletters, which include Rice
Briefs, which covers Colussiolo,Rice Notes, which covers Yuba
Sutter, Rice Leaf, which coversButte and Thanks for listening
(16:32):
to Thoughts on Rice, aUniversity of California
Cooperative Extension podcastfrom the University of
California Agriculture andNatural Resources.
You can find out more about thispodcast on our website,
thoughtsonrice.buzzsprout.com.
We'd love to hear from you,whether it's from using our text
(16:53):
link in the show notes, a surveysubmission in our feedback form,
also in the show notes, or in acomment or rating on your
podcast streaming service ofchoice.
Harvest is right around thecorner.
Remember, like the growers liketo say, have a rice life.
(17:14):
Mention of an agrochemical doesnot constitute a recommendation,
merely the sharing of researchfindings.
Always follow the label.
The label is the law.
Find out more at ipm.ucanr.edu.
The views, thoughts, andopinions expressed are the
speaker's own and do notrepresent the views, thoughts,
and opinions of the Universityof California.
(17:35):
The material and informationpresented here is for general
purposes only.
The University of Californianame and all forms and
abbreviations are the propertyof its owner and its use does
not imply endorsement of oropposition to any specific
organization, product, orservice.
(17:57):
We'd like to acknowledge thebird calls that came from the
All About Birds website from theMacaulay Library.
Special thanks to Ed Pendelfinofor his recording of the
California Bicolored Song inCalifornia, April 6, 2016.
Special thanks also to James JimHolmes of the Macaulay Library
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for the Tricolored BlackbirdSong recorded in California,
March 11, 2017.