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Popular Discussions
- Clearing the Air: Outdoor Wood Boilers Face Regulation (30)
- Lumber, Chips, and Sawdust: For Sawmills, There’s No Such Thing as Waste (12)
- Indian Pipe (9)
- Tale of the Tick: How Lyme Disease is Expanding Northward (8)
- Forests Can’t Fight Climate Change (7)
- First Snow (5)
- Bears Fattening Up for Winter’s Slumber (5)
- Opening Camp (5)
- Wood Pellets (5)
- Wet Weather Wondering (5)
- In Sight of the Property Line (5)
- The Haitian Landscape (4)
- Log Trucks and Highways (4)
- Mill Prices: Autumn 2009 (4)
- Alarms Ring As Borer and Beetle Move This Way (4)
Under the Microscope Archive
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Sapstreak Disease
On a walk through a still, snowy sugarbush, the peacefulness can be overwhelming; everything looks to be in good order. But all may not be as perfect as it seems. In any sugarbush, there is a good chance that a fungal intruder has gained entry and is wintering unseen beneath the rich, dark bark of an unlucky sugar maple. If… (more)
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Hay-Scented Fern
Wily, non-native plants that outperform native species and proceed to carpet the forest and field are all too familiar nowadays. Most of us have seen understories of European buckthorn or Eurasian honeysuckle species where normal tree regeneration doesn’t stand a chance. The wild chervil, garlic mustard, and wild parsnip introduced from Europe seem to have supernatural powers as they march… (more)
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Blue Stain, Also Called Sap Stain
Most loggers are well aware of the perils of blue stain. If freshly cut logs are left for any length of time in the summer months, one of the many species of fungus that leave bluish streaks in the wood is sure to invade the logs, dramatically reducing their value. White pine and sugar maple are among the most vulnerable… (more)
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Fire Blight, Erwinia amylovora
An apple orchard in late May, just as the trees’ deep pink buds expand into pale pink blossoms, is one of the most beautiful places on earth. I won’t tell about the smells or the songs of birds to further describe this heaven, because this story is about fire blight, a bacterial disease that first strikes right at this magical… (more)
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Crown Gall, Agrobacterium tumefaciens
Crown gall, the common name for Agrobacterium tumefaciens, is one of the most famous plant diseases in the world. This bacterium can cause galls in more than 600 plant species, some of which are trees. Members of the rose family, including apples, pears, peaches, and cherries, are especially susceptible; willows and poplars are also vulnerable. Vineyards can be troubled by… (more)
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Apple Scab, Venturia inaequalis
Although apple scab is everywhere all the time, it is most apparent in the fall, as we try to avoid apples spotted with its telltale, ugly, black lesions. Those spots, it turns out, were predetermined in the spring. In order for the apple scab fungus to get a start, the leaf surface needs to be wet. Since spring is a… (more)
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Whitespotted Sawyer
If, when quietly wandering around outdoors, you have ever heard and tried to track down a rhythmic, grating sound, thinking you were in search of a small rodent or perhaps a cricket, only to find that the noise comes from within a dead log, the noisemaker might well be the larva of the whitespotted sawyer. Its chewing noise is described… (more)
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Birch polypore, Piptoporus betulinus
Also called birch bracket, this distinctive fungus only grows on birches, looks like nothing else that grows on birches, and is very common. Also in its favor from the human perspective is that it is not an aggressive tree killer, but is instead primarily in the business of decomposing dead trees. Birch polypore is present throughout the range of the… (more)
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Pine Bark Adelgid, Pineus strobi
The bark of older and larger white pines is crusty and ridged, but before that, in youth and adolescence, a pine’s bark is smooth, interrupted only by whorled branches, and is usually a deep charcoal gray. Sometimes, in contrast to what should be, the bark is washed with startling white, a sure sign that something is wrong. Pine pitch is… (more)
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Woolly Alder Aphid, Prociphilus tessallatus
On warm days in September and October, puzzling specks of wool are sometimes seen sailing along on the breeze. Some of these fuzzballs might be woolly alder aphids, insects that have been sitting tight and sucking sap on alder all summer but which now are migrating to their winter homes, usually on silver maple. More than half of each speck… (more)