Thursday, March 14, 2013

Mystery Plant Solved

About a week ago I was presented with the below pictures from somebody who wanted to know what the tree was.  They had seen and photographed the tree in Manila, the Phillipines. I observed that the leaves were somewhat like Albizzia julbissen  the Mimosa tree but the flowers appeared totally different. Knowing that the unkown tree was probably in the pea family (Fabaceae) I used www.plantsystemics.org to browse around that family. I found Parkia multijuga but that didn't seem to be exactly what I had. I then entered 'Parkia' into Google image search which brought up an image that looked like the plant I was looking at; Parkia javanica. Parkia javanica is native to southeast Asia and  is used medicinally there to treat Diarrhea and stomach infections. 
Photo of Parkia javanica flowers that I was asked to identify. 

Parkia javanica flowers that I was asked to identify.

Parkia javanica immature flowers. 

Parkia javonica flower that seems half eaten away. 

Sunday, March 10, 2013

Saturday, March 2, 2013

Potpourri of Peacock Platitudes



Our Peafowl are Probably Here to Stay

Besides making it impossible to plant many tender annuals and other plants because of the peafowl's propensity to feed on the tender new growth and flowers of many plants, peafowl at the Arboretum eat bugs, snails, slugs and many other pests that would decimate far more plants than the peacocks could possibly damage. They also feed on snakes which may be why snakes are seldom seen here at the Arboretum. 
  
We Are Not the Only Place In Greater L.A. to Be Blessed with these Fowl  -Here Are Some Other Areas That Have Them:

Victor Heights – a working class section of LA west of Chinatown.  Peacocks are actually part of the neighborhood here; are not unwelcome guests.  They are described as noisy, disruptive, and temperamental but neighbors have grown to accept them.  Eggs are left on porches to hatch, people drive slowly to avoid hitting the peafowl, children collect their feathers, and people enjoying watching the funny mating rituals often performed in the streets.  No one claims ownership over the stubborn and independent peafowl; old-timer residents feel they are their protectors and feed them unsalted shelled peanuts, fruit, dry cat food, birdseed, toasted bread. 

L.A. Times Article on Victor Heights Peafowl: http://articles.latimes.com/2009/may/11/local/me-peacock11

Palos Verdes – peacocks came here in the 1920's when a wealthy landowner was given peacocks as a gift because the area was too quiet.  They Dapplegray neighborhood in Rolling Hills Estates is considered a peafowl protection zone.  Some newer residents are not peacock friendly – there are have peacock hit-and-runs.  Mary Jo Hazard wrote a children’s book called “The Peacocks of Palos Verdes”

Transcript of above:

Arcadia – E.J. “Lucky” Baldwin, founder of Arcadia, imported peacocks while on a trip in India around 1880.  They are very useful for the ranch, eating snakes and snails, and were good watchdogs (alerting when large predators were near with loud cries).  Ownership was a status symbol, and it was fashionable in the late 1800's and early 1900's for well-to-do people to decorate their properties with unique animals.  One source believes Baldwin to be the first to bring peacocks to the continental United States.  One rumor believes Baldwin gave peacocks to Frank Vanderlip, owner of the Palos Verdes peninsula, but they were actually given to Vanderlip by the Wrigley family (chewing gum). The last census of Arboretum peafowl was done almost ten years ago by students from Caltech found over 400 populating the grounds.
L.A. times article on Arcadia Peacocks:

La Canada Flintridge – peacocks came in the early 1900s, when Kansas Judge Edwin Sargent bought the property he found them there. LA attorney Frank P. Doherty bought the land from Sargent in 1936. The peacocks killed and ate rattlesnakes, which were a nuisance in the area.


Santa Susana Pass, Ventura County – Ten years ago the wild peacocks there were causing such a nuisance that some residents complained to the Ventura county animal control officials.  The county rounded up 30 peafowl and removed them to Wildlife Way Station – a refuge for exotic animals in the Angeles National Forest.
Supporters of peafowl like that they kill rattlesnakes and insects, squawk when coyotes are near, and the population seems to be controlling itself.  Non-supporters don’t like the damage to gardens, the noise, and the droppings.

Peafowl Abroad:

Peacocks in China:

The peacock (孔雀) is an earthly manifestation of the heavenly phoenix, and the hundred eyes on its tail are believed to activate fame, luck, promote public admiration and bring positive motives from other people. The peacock is believed to be able to relight the fires of an ailing relationship due to the fiery energy of the animal.

It associated with Guan Yim (goddess of compassion, mercy and kindness); both transmute evil into beauty as the peacock feeds on snakes and Guan Yim helps the suffering thereby turning evil into beauty.
In decorative art, the peacock symbolizes dignity and beauty.

Peacocks in India:

Wild peacocks originated in the deep forests of India; the Indian the peafowl is the national bird of India.  People like having peacocks around because they eat small poisonous snakes and other pests.

Indian blue peacocks are not considered endangered, but the green specie is endangered in southern parts of Asia (mostly in India) due to deforestation and hunting/poaching

Eating peacock:

Peacock served in hotels in China and has been well received for its sweet and fragrant taste and its low fat content.

Eaten in rural areas of Australia; the meat is described as cross between chicken and duck, and quite substantial.  Since the undomesticated peacocks fight constantly in the breeding season, they try to keep those numbers down by eating 2-3 peacocks a year.

Peacock was a popular dish in medieval Europe reserved for the royal and noble classes.  The custom was to serve the bird in its feathers for dramatic display.  According to an article by a gourmand who prepared it the meat is not as good as turkey, goose, or pheasant – and it is rather dry.

Peacock Evolution:

Peacocks have been at the center of the controversy between evolutionists and creationists recently. Previous studies showing that pea hens preferred not to mate with peacocks with a reduced number feather eye-spots. A slew of recent studies, several done here at the Arboretum, have added to what the older studies had concluded. One such such study found that peacocks with the highest eye-spot numbers did not have more mating success than other peacocks. This study was immediately jumped on by creationists as proof against sexual selection. However other recent studies have suggested that a minimum number of eye-spots is necessary, but having more than the minimum does not guarantee additional success. Other studies have found that, besides having the minimum number of spots a peacock with an exceedingly iridescent (iridescence is the glowing, vibrant quality of the peacocks coloration that is the result of the Bragg reflection) eye-spots were more successful at mating. It is thought that the quality of the eye-spots iridescence reflects the overall health and fitness of the male peacock.


Study equating mating success to eye-spot iridescence: http://beheco.oxfordjournals.org/content/18/6/1123.full

Peacock researcher Roslyn Dakin’s blog (from 5/52008 and earlier she blogs about here experience here at the Arboretum):

 Thanks to Arboretum Volunteer Angela Lee for compiling this list. 

Friday, February 22, 2013

Close-up of Abutilon x hybridum Stigma

Abutilon x hybridum stigma close-up taken with my new Digimicro digital microscope.
 
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Mountain Mahogany Mulch Misery

I just had a call from a gentleman in Sunland who wanted to know what a good pesticide for Mountain Mahogany (Cercocarpus betuloides) would be. I asked him what the circumstances were. He told me that he had several mountain mahogany plants on his property, but the one located in a partially shaded area had been infested with some kind of white-fly or scale for almost six months. He recounted how he had applied a product containing imidacloprid ( a 'systemic' insecticide that is closely related chemically to nicotine) and that had helped but it wore off and the problem is just as bad. I started asking him some questions:

  • Q. How often is the plant watered? A. Very little supplemental water. 
  • Q. Have you fed the plant?  A. No
  • Q. Have you mulched the plant well and if so, with what?....
                    Now this last question is a somewhat of a trick question....

He answered that he had mulched his plantings with redwood bark. Mulching is usually a good idea -it helps provide organic material to the soil so that microorganisms beneficial to the plant can increase in the soil. However mulching also produces nitrogen, which can be detrimental to many native California plants...especially plants like Cercocarpus betuloides which have roots that fix the plants own nitrogen. 

So what happens when you mulch a Cercocaprus betuloides with an organic mulch that breaks down to provide nitrogen (a plant whose tissues are chock full of nitrogenous compounds to begin with from its own nitrogen fixing activity)? First you get an increase in green, succulent growth which is attractive to insects like whiteflies, scale, aphids etc. that feed on the food conducting tissue, the phloem, of the plant. To make matters worse besides increasing the plants susceptibility to these insects the increased nitrogen content of the sap caused by the mulch actually helps these pests reproduce! So mulching with a nitrogenous mulch is like pouring gasoline on a brush fire for these plants. Unfortunately for my caller, redwood bark is such an organic mulch (although its nitrogen release is delayed and much slower than other organic mulches), and it can even be toxic to some plants under the right circumstances..so what to use?

 Decomposed granite (D.G.) comes in many different sizes from fine particles that congeal like clay when they dry to almost pebble sized grains. Since D.G. does not break down to provide nitrogen it is ideal for those California natives that fix their own nitrogen and so might suffer if a nitrogenous mulch is applied. So not only is D.G. a good alternative for nitrogen sensitive plants like Cercocarpus but if you're mulching with the smaller, soil-particle sized D.G. you have a situation that can attract native bees which prefer nesting on bare ground. 

Thursday, February 7, 2013

A Request for London Pride

I received a request by phone today for a 'London Pride' Saxifraga and was intrigued by the plants history. Apparently during the dark days of the London Blitz this hardy rock garden plant would be the first to colonize the fresh bomb craters. It's plucky colonization and the rather rapid interval between its appearance and flowering were a source of inspiration to war weary Londoners. It was so inspirational that it inspired a wartime song by composer/playwright Noel Coward. 

Finding a London Pride plant however, was a daunting task. It is not carried by local nurseries (it likes dank, moist environments like London and Ireland) and finding any nurseries in the continental U.S. that did carry the plants was impossible. After much searching  however,  I did find a seed source in Devon, U.K., which was fortuitous because the caller had friends there who could procure them for her. 



Saturday, February 2, 2013

Jack Frost Nipping at Your Nolina...

Frost damaged mango tree.
The recent spate of frost has left many local gardeners tropical and semitropical plants looking dismal, decrepit, and destroyed. But now is not the time to clean house and start over. Many times frost damage is far worse looking than it actually is, and many plants can recover from frost damage if you take some simple steps and refrain from taking others. Here is a list:
Do not prune any frost damage off of your plants until all danger of additional frost has past. The dead and damaged tissue of a frost damaged plant can act as an insulator, protecting the living tissue beneath from further frost damage.

Frost cloth like this is specially designed to keep frost off of the plant while allowing air to flow through. 


Purchase "Frost Cloth" and cover your susceptible plants (including already damaged ones) when frost is predicted.

Spray 'Cloud Cover' or a similar anti-transpirent on your plants. These compounds prevent the plant from drying out when exposed to frost. They are harmless to the plant and give you an extra layer of protection besides the the frost cloth.

Anti-transpirants like 'Cloud Cover' help protect the plant by plugging stomata, the small holes in the leaves and stems of plants, and thus preventing the plant from drying out as the result of frost.

The above actions should help minimize frost damage until all danger of frost has past (here usually mid-March). After that period is over you may need to re-assess what you are planting and where you are planting it.

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Friday, February 1, 2013

Full Moon over Rancho Santa Fe

Q.Are 'Full Moon ' maples (Acer japonicum) suitable for Southern California? If not, What variety of maple do you suggest? I live in The Rancho Santa Fe area of North San Diego county.

A. I've seen 'Full Moon' maples growing in protected spots or as bonsais here in Southern California. If you decide to grow them you should keep them in pots located in protected areas with filtered shade; also when they grow here their leaves tend to burn starting about mid-summer.

If that's not discouraging enough there’s another problem now –many maple species here are under attack by a pest called the Polyphagous Shot Hole Borer. This beetle has been killing maples here and will probably only get worse, so you taking a big gamble no matter what maple you plant. The pest is currently not in San Diego County but at the current rate of spread may soon be.  

University of Conneticut Horticultural Information Page:


Mendecino Maples Acer japonicum selection:


 

Saturday, January 12, 2013

NEW OAK THREATS WORKSHOP


I helped out at the “New Oak Threats Workshop” today at the Huntington. This was an outreach program for tree professionals and the general public to alert them to the spread of the Polyphagous Shot Hole Borer and what steps they can take to help stop or slow down the spread of this potentially massive threat to both native and ornamental trees here. Much of the information about this pest can be found here on Dr. Akif Eskalan’s lab page, but some important new information was revealed at this seminar. Here’s my summary of what that is:

-Chipping infested wood, solarizing it and leaving it on site under a sealed tarp or composting the chips is the best way to prevent the beetle from re-emerging from cut wood and infesting new trees or re-infesting already infested trees and increasing the level of damage to the trees.

-Several insecticides have been tried on the chipped wood and two common ones have proven effective (at preventing beetles from emerging from the chipped wood; trials on trees are not finished).

-This infestation is so large and potentially devastating that Dr. Akif’s lab is reaching out to tree professionals, horticultural professionals, and governmental departments that deal with trees for help in identifying possible infestations.

-California State University San Bernardino is hosting a web application that can be opened up in your smartphone to report suspected shot hole borer or suspected gold spotted oak borer occurances. The app uses your phones gps to report on the location of the damage. If you want to be part of the team that can help deal with these threats to our oaks and other plants, both native or non-native, just cut and paste this link: (http://wrimedia.csusb.edu/oaktree/mobileapp/survey.php ) into an email to yourself and open it up in your smartphone.

-The number of tree species affected by the borer is growing; over 200 trees are known to be attacked by the borer, and the list of reproductive hosts, i.e. hosts that are not only attacked by the borer but help to spread the infestation, has grown. The reproductive host list now includes 22 species and will probably increase (California native plants are in red type): 

·           Box elder (Acer negundo)
·        Castor bean (Ricinus communis)
·        Avocado (Persea americana)
·        English oak (Quescus robur)
·        Coast live oak (Quercus agrifolia)
·        California Sycamore (Platanus racemosa)
·        Big leaf maple (Acer macrophyllum)
·        Mimosa (Albizia julibrissin)
·        American sweet gum  (Liquidambar styraciflua
·        Silk Tree (Albizia julibrissin)
·        Coral tree (Erythrina corallodendon
·        Titoki (Alectryon excelsus)
·        Blue palo verde (Parkinsonia florida)
·        Palo verde(Cercidium floridium)
·        Tortuosa (Salix matsudan)
·        Weeping willow (Salix babylonica)
·        Red Willow (Salix laevigata)
·        Trident maple (Acer buergerianum)
·        Japanese maple (Acer palmatum)
·        Evergreen Maple (Acer paxii)
·        Chinese holly (Ilex cornuta)
·        Brea (Cercidium sonorae)
·        Black bean (Castanospermum australe)
·        Camelia (Camelia semiserrata)

Here are some links to more information about the Polyphagous Shothole Borer:


Tuesday, January 8, 2013

New Oak Threats Workshop - Agriculture and Natural Resources - University of California

Join me, I'll be helping out here showing participants examples of Polyphagous Shothole Borer damage at the Huntington. I'm hoping that this forum may also provide some new insights on the control and management of this and the Gold Spotted Oak Borer. These two pests are currently considered a serious threat to oak woodlands.

New Oak Threats Workshop - Agriculture and Natural Resources - University of California:

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Thursday, November 1, 2012

*Update Possible Polyphagous Shot Hole Borer in the Wild on Coast Live Oaks

Just got back from a property located about 15 minutes northwest of here. The manager of the property found what looks like Polyphagous Shot Hole Borer on five Coast live oaks located in an historic stand in an unirrigated area. All five are dead or near dead, and the signs die back occurred within a months time. I am waiting on confirmation from Dr. Akif Eskelan and the folks at UCR, but it it isn't PSHB then its something that looks just like it. Below are images of the trees that were infested. If you see anything like this or what is described here, please contact me as soon as possible at 626 821-3236
Update: Akif Eskelan's lab has confirmed that this is NOT an infestation of PSHB (That's a relief). However it may be a previously unknown borer and fungus combination. 

-Frank McDonough, Botanical Information Consultant at the L.A. County Arboretum and Botanic Garden.

Possible Polyphagous Shot Hole Borer on Coast live oak (Quercus agrifolia)

Notice the dark, oozing stains that appear on the trunk. 

This almost dead Coast live oak has noticable soaking spots up and down its trunk. Most of these appear on the south side of the tree. 

Possible PSHB entry holes with oozing fluid. 






Tuesday, October 30, 2012

A Nuisance Bug that Doesn't Stink

A fellow employee here at the Arboretum brought this to me. It was massing outside of her house in large numbers. They seem to be making there way into her house and becoming a nuisence there.  It's about a 1/2 an inch long and has really nice red markings on its thorax and abdomen. Turns out this is the Red-shouldered bug . It's listed as feeding on the seeds of Koelrueteria trees so control consists of keeping the seeds raked up off of the ground. I asked my fellow employee if she had any Koelrueteria trees around and she said that, yes, she had three of them in the same area as where the bugs were a problem.
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Tuesday, October 16, 2012

Another Possible Polyphagous Shothole Borer Infestation in Altadena

Visible ooze possibly from PSHB infestation.
I received an email from resident of Altadena who had just had a large oak transplanted this last November. The tree was not doing so well and he was wondering what was happening to the tree. Turns out the tree may be suffering from PSHB infestation. Pictures of the tree he sent me seem to show the typical 3-6 inch small oozing spots with sometimes discernable small white spots of sawdust surrounding small 1/8" holes in the bark. This is just a photo diagnosis so it is no way the final word on this tree. Although live oaks are known to be reproductive hosts for the PSHB, how destructive they might be to oaks in good health is still unknown.




3" by 2" ooze spot and entrance hole (midway on the left of the spot).
 
Oak trunk showing ooze spot.
 

Oak canopy showing thinning. How much of this thinning is due to PSHB is unknown; the tree was transplanted less than a year ago.
 
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Thursday, October 11, 2012

Elder Blues

I got a call about a sick 'Alder' tree that was just about dead, turns out the tree was a Box elder, a type of maple tree with compound leaves that don't look like a maple. This tree is very confusing. It's also the number one victim of the new Polyphagous Shot Hole Borer (PSHB).  This pest is just hideous and seems to be gaining new victims (known in plant pathology circles by the innocuous term 'hosts') every month.I asked the caller to send me pix of the tree by email and sure enough, it was infested with  PSHB.

Here are some of the pix he sent me:

The Box elder's confusing leaves. 
Notice the dark wet-looking patches with the mounds of sawdust in the middle of them. 

An even better look at the oozing and the sawdust spots. 

Friday, October 5, 2012

(Possible) Shot Hole Borer Blues

The Polyphagous shothole borer is starting to make the news, and rightly so. Just last week I found one of our Brazilian peppers possibly dead from the beetle/fungus combination. 

Brazilian pepper tree (Schinus terebinthifolius) that may have been killed by shot hole borer. 

Closeup of branch from possible shot hole borer infested Brazilian pepper tree. The dark stains may be from the Fusarium fungus that the beetle infects the tree with. 
This pest/fungus combination is starting to show up all over the place -it's quite an extensive infestation. Just before I started writing this post a gentleman called about his tree that was dying and emailed me some photos of it; it was a Box elder. Box elders have been the canary in the coal mine for this thing and his was located in Monrovia. I'll be writing more about it shortly, and I'm writing more extensive article about the infestation for the Arboretum website.

Pest and Disease Threats to Southern California Oaks: I'll Be Presenting At This Seminar

Welcome! - Pest and Disease Threats to Southern California Oaks:

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