Archive for the 'Trees' Category

Jan 26 2017

Faster Than Expected

Emerald Ash Borer galleries in bark (photo by April Claus)

Emerald Ash Borer galleries in bark (photo by April Claus)

On Throw Back Thursday:

Back in January 2010 when I first learned about emerald ash borer, I thought we’d see a slow decline of ash trees in the Pittsburgh area.

Not so!  The bugs wiped out the ashes much faster than expected.  Within five years Schenley Park’s ash trees were dead except for the few treated with pesticides.

What did things look like as the invasion began?  Here’s a look back seven years.

Doomed

One response so far

Nov 19 2016

Burls

Published by under Trees

Burl on black locust trunk (photo by Kate St. John)

Burl on black locust trunk (photo by Kate St. John)

November’s a good month to get reacquainted with trees. After the leaves are gone unusual features stand out.  That’s how I noticed these burls.

Burls are dense growths of deformed-grain wood and failed buds found on tree trunks or roots.  They’re a tree’s stress reaction to virus, fungus, bacteria or injury.

The wood in burls is sometimes beautiful but very dense and hard to work with.  Some species create particularly beautiful burl wood.  My hunch is that these two do not.

Above, a black locust.  Below, a white oak.

Burl on white oak (photo by Kate St. John)

Burl on white oak (photo by Kate St. John)

Take time this month to look at trees.

 

(photos by Kate St. John)

No responses yet

Sep 11 2016

Unusual Trees

Published by under Travel,Trees

Tree trunk bowed and bare (photo by Kate St. John)

Tree trunk, bowed and bare (photo by Kate St. John)

Last week I found some odd trees in Acadia National Park.

Above, a dead tree is bowed over in a perfect C, probably knocked over in its youth by wind, ice or another tree.

Below, the swirls on this cedar look like drapery.

Pattern of growth on cedar trunk (photo by Kate St. John)

Swirled pattern of growth on cedar trunk (photo by Kate St. John)

 

Evergreens usually lose their lower branches as they grow but the branches on this tree grew stout and curled up.  I can’t even imagine what caused this.

Odd branching on a pine, Mount Desert Island, Maine (photo by Kate St. John)

Odd branches, Mount Desert Island, Maine (photo by Kate St. John)

 

(photos by Kate St. John)

No responses yet

Jul 27 2016

Alien On The Loose

Asian longhorned beetle animation linked from USDA website

Asian longhorned beetle animation linked from USDA website.

Eeeeewww!  It’s an alien!

I’m not kidding.  This bug is an alien invader from China that hitchhikes as larvae in wooden packing material.  When it gets here it eats trees … lots of them!  If it shows up in your neighborhood it has to be eradicated.  Otherwise your town is doomed.

The Asian longhorned beetle (Anoplophora glabripennis (Motschulsky, 1853)), or ALB, is a very large wood-eating beetle native to China and the Korean peninsula.  Its white-spotted black body is an inch long with antennae 1.5 to 2 times longer than its body.  The antennae are unique, banded black and white.

Because it arrives in infected wood, ALB’s first location in North America is a warehouse. From there it spreads unpredictably, depending on the shipment.  It’s been found in suburbs and cities in New York, New Jersey, Massachusetts, Illinois, Ohio and Ontario.  Click here for the map as of July 2015.

When the beetle gets loose it’s not picky.  Its eats maples, elms, birches, willows, poplars, ashes, hackberries, horsechestnuts, London planetrees … just about anything … but it takes 3-4 years to notice it.  The adults are active late spring until fall so July is a good time of year to see its damage or the bug itself.

And this bug is noticeable. Big and showy, even its larvae (at left) are huge.

Larva and adut Asian longhorned beetle (photos by Joe Boggs, Ohio State University, Bugwood.org)

Larva and adult Asian longhorned beetle (photos by Joe Boggs, Ohio State University, Bugwood.org)

If you don’t see the bug you may see its evidence.

This unusual leaf damage is a hallmark of ALB. They eat the ribs of leaves, not the papery part.

Leaf damage from Asian longhorned beetle (photo byPennsylvania Department of Conservation and Natural Resources - Forestry , Bugwood.org)

Leaf damage from Asian longhorned beetle (photo by PA DCNR, Forestry at Bugwood.org)

Its entrance and exit holes are unique, too.

The female excavates a niche in the bark and lays her eggs in the hole.  Each roughly chewed egg niche is half the size of a dime.

Two egg niches drilled by Asian longhorned beetles (photo by Joe Boggs, Ohio State University, Bugwood.org)

Two egg niches drilled by Asian longhorned beetles (photo by Joe Boggs, Ohio State University, Bugwood.org)

To get out of the tree, the beetle chews a perfect-circle hole as big as a pencil!

Asian longhorned beetle exit holes (photos by Leslie J. Mehrhoff, University of Connecticut and Joe Boggs, Ohio State University, Bugwood.org)

Asian longhorned beetle exit holes (photos by Leslie J. Mehrhoff, University of Connecticut and Joe Boggs, Ohio State University, Bugwood.org)

We can stop ALB if he’s confined to cities but if he gets loose in our forests all bets are off.

So if you see an Asian longhorned beetle or its damage, report it.  There are some look alikes, but USDA wants us to be better safe than sorry.  Call them at 1-866-702-9938 or click here for details.

Report this invader!  Don’t let him take hold!

Adult Asian longhorned beetle in someone's hand (photo by Michael Bohne, Bugwood.org)

Adult Asian longhorned beetle in hand (photo by Michael Bohne, Bugwood.org)

 

Read more about Asian longhorned beetles at USDA’s beetlebusters.info website.

(beetle animation linked from USDA’s website, photos from Bugwood.org)

4 responses so far

Jul 12 2016

Gone But Not Forgotten

Cicada damage on an oak tree (photo by Kate St. John)

Cicada damage on an oak tree (photo by Kate St. John)

After weeks of roaring in late May and June, the 17-year periodical cicadas (Magicicadas, Brood V) are gone but not forgotten.

During the mating frenzy the females used their ovipositors to slit the bark near the ends of twigs and deposit up to 600 eggs per slit. Weeks later the adults are dead but they’ve left their mark on the trees.  The slits killed the leafy branch tips.

Everywhere you go in cicada country the trees are green inside and brown at the tips.  (This is called “flagging.”)

Cicada damage on an oak tree (photo by Kate St. John)

Cicada damage on an oak tree (photo by Kate St. John)

The trees look as if someone has sprayed defoliant on this year’s new growth.  Fortunately that’s not the case!

Cicada damage on an oak tree (photo by Kate St. John)

Cicada damage on an oak tree (photo by Kate St. John)

The trees will be fine.  They have plenty of time to recover before Brood V reappears in 2033.

If you lived through the cicada invasion this summer, you won’t soon forget their roar.

If you missed them, your next big chance near Pittsburgh will be Brood VIII in 2019.

 

(photos by Kate St. John)

4 responses so far

Apr 16 2016

Buds Bursting

Horse chestnut bud bursting, 13 April 2016 (photo by Kate St. John)

Horse chestnut bud bursting, 13 April 2016 (photo by Kate St. John)

Last week’s cold weather was deadly for flowering trees but good for those still in bud.

A hard freeze on April 5 —  23 o F — wiped out the early-blooming trees in Schenley Park.  Most of the eastern redbuds had already flowered so Schenley’s redbud display this year is anemic.

On the other hand, buds that were closed 10 days ago are in good shape now.  On Wednesday I found a horse chestnut bud about to burst (above) and one with leaves and flower stack already emerged (below).

Horse chestnut leaves and flowers stack emerged from bud, 13 April 2016 (photo by Kate St. John)

Horse chestnut leaves and flowers stack emerged from bud, 13 April 2016 (photo by Kate St. John)

 

Even the hickories are getting into the act.

Mockernut hickory bud opening, Schenley Park, 13 April 2016 (photo by Kate St. John)

Mockernut hickory bud opening, Schenley Park, 13 April 2016 (photo by Kate St. John)

 

Check out your neighborhood for emerging leaves and flowers. Buds are opening fast in this weekend’s warm weather.

 

(photos by Kate St. John)

6 responses so far

Apr 13 2016

Pittsburgh’s Redbud Project

Published by under Books & Events,Trees

Redbud blooming (photo by Dianne Machesney)

Redbud blooming (photo by Dianne Machesney)

Imagine that Pittsburgh was as beautiful in the spring as Washington, D.C. during the Cherry Blossom Festival.

That’s the vision that local landscape architect Frank Dawson had when he proposed planting eastern redbud trees along Pittsburgh’s riverfronts.

This spring the dream is starting to come true.

Thanks to a grant from Colcom Foundation, the Western Pennsylvania Conservancy is launching the Pittsburgh Redbud Project.  From now through Spring 2017 they’ll plant 1,200 eastern redbud and other native trees in Downtown Pittsburgh and along the city’s riverfronts.  Everyone who helps through May 12 will get a free seedling. (They’re giving away 1,500 of them!)

Eastern redbuds (Cercis canadensis) are understory trees in the Pea family that bloom in early spring.  Native from southern Pennsylvania to eastern Texas, they’re cultivated for their beauty because their rose-pink flowers open on bare branches before the leaves.

Come to the Redbud Project’s Launch Event on Tuesday, April 19 at 10:00am at the Three Rivers Heritage Trail near the Mister Rogers statue.  Students and volunteers will plant 60 trees along the riverfront.  Attendees get a free redbud seedling.  (Click here for more information, here to RSVP.)

Here’s a planting along River Avenue to give you an idea of the beautiful results.

Redbud trees along River Road, Pittsburgh, April 2016 (photo courtesy Western PA Conservancy)

Redbud trees along River Avenue, Pittsburgh, April 2016 (photo courtesy Western PA Conservancy)

More events and volunteer opportunities are coming in the weeks ahead. Click here for a list.  Get a free tree!

Soon our Downtown and riverfronts will be transformed.

 

(photos: redbud flowers’ closeup by Dianne Machesney. Row of redbud trees on River Avenue, courtesy Western Pennsylvania Conservancy)

7 responses so far

Dec 26 2015

From A Different Angle

Bare trees from a new angle (photo by Kate St. John)

Bare trees from a different angle (photo by Kate St. John)

When my camera couldn’t capture this horizontally, I turned it sideways to photograph the trees.

I like them this way better than in the “normal”orientation.

Put your left ear on your left shoulder to see what I mean.

 

p.s. I took this photo four years ago but didn’t label it.  Based on their bark I think these are sugar maples … but their branches don’t look right.

(photo by Kate St. John)

4 responses so far

Dec 06 2015

Now’s The Time To Look For…

Hemlock wooly adelgid (photo courtesy Sarah Johnson, The Nature Conservancy)

Hemlock wooly adelgid (photo courtesy Sarah Johnson, The Nature Conservancy)

Last week Sarah Johnson at The Nature Conservancy reminded me that early November to late March is the time of year to be on the lookout for hemlock wooly adelgid.

The Nature Conservancy, Pennsylvania DCNR, and the US Forest Service are tracking the advance of hemlock wooly adelgid (HWA) in hemlock conservation areas and the High Allegheny Plateau of northwestern PA and western NY.  They need your help.

Hemlock wooly adelgid (Adelges tsugae), originally from Japan, kills eastern hemlocks in 4-20 years by sucking the lifeblood out of them.  A hemlock with an adelgid infestation like the one above is doomed.

By knowing where HWA has newly arrived, the survey may be able to treat key trees until a winter-hardy biological agent is ready.

So if you’re out birding in Pennsylvania’s north woods(*) and you see these white wooly balls at the base of needles on the undersides of hemlock branches, it’s the dreaded adelgids.  Note your location and contact one of the folks on this list.  Do NOT take a sample.

If you’d like to participate in the official survey, call or send email to Sarah Johnson at sejohnson@tnc.org, 717-232-6001 Ext 231.

 

(photo of hemlock wooly adelgid courtesy Sarah Johnson, The Nature Conservancy)

(*) The survey location runs from Cook Forest to New York’s Allegany State Park.

3 responses so far

Nov 28 2015

Anyone Home?

Published by under Musings & News,Trees

Anyone home? (photo by Kate St. John)

Hole in a sugar maple in Schenley Park (photo by Kate St. John)

When I see a hole like this I wonder if an animal is inside.

In the winter it could be sheltering chickadees or tufted titmice.  If it’s big enough it may hold a squirrel … or something even better.

When you’re in the woods on a cold sunny afternoon, look for tree holes.  You might see an owl peeking out of one.

Anyone home?

 

(photo by Kate St. John)

2 responses so far

« Prev - Next »