An Invasive Moth Killed Thousands of Acres of Oak Trees, but Some Trees Survived – Here’s Why


Photo of a Lymantria. Credit: Nathan Oalican

For Trees, Carbs Are Key to Surviving Insect Defoliation

A recent multi-year outbreak of an invasive moth killed thousands of acres of oak trees across southern New England. But interspersed among the wreckage were thousands of trees that survived. A new study published today (August 13, 2021) in Functional Ecology sheds light on why. Research by scientists from Harvard, UMass Amherst, Boston University, and MIT reveals that a tree’s carbohydrate reserves are crucial to surviving an onslaught of hungry caterpillars.

The biology of trees makes them resilient to even the most severe stressors. “Oak trees are planners, in a way,” says Meghan Blumstein, NSF Post-doctoral Research Fellow at MIT and a co-author of the study. “Some of the food they make during the growing season is used immediately for energy and some is stored in the stems and roots for a rainy day. With stored carbs, they are able to immediately create a new flush of leaves after an insect outbreak.”

But trees are not invincible, and the new study reveals the specific threshold of reserves necessary for them to survive: 1.5 percent carbohydrates in their dried wood– or about 20-25% of their normal storage capacity. The repeated emergence of Lymantria dispar (an insect formerly known as “gypsy moth”) from 2016 to 2018 challenged trees’ resilience by defoliating them year after year.

“The trees that died were the trees that were out of reserves,” says lead author Audrey Barker Plotkin, a Senior Scientist at the Harvard Forest. But the location of the trees mattered, too. The research team found that trees growing along forest edges tended to have more reserves, even at the same level of defoliation, making them more resilient than interior forest trees. The research team posits that forest edge trees may have simply experienced less severe defoliation in the years before 2018. And, because edge trees get lots of light, they may also be able to rebound without drawing down their reserves as much as their interior forest counterparts.

The new study provides direct evidence, that had until now been lacking, that trees can indeed starve to death when insects invade. This more nuanced understanding will help improve forest resilience models as new pests and a shifting climate continue to drive change in the region.

Reference: “Defoliated trees die below a critical threshold of stored carbon” by Audrey Barker Plotkin, Meghan Blumstein, Danelle Laflower, Valerie J. Pasquarella, Jennifer L. Chandler, Joseph S. Elkinton and Jonathan R. Thompson, 12 August 2021, Functional Ecology.
DOI: 10.1111/1365-2435.13891

9 Comments on "An Invasive Moth Killed Thousands of Acres of Oak Trees, but Some Trees Survived – Here’s Why"

  1. Rembrandt Zegers Ph.D. | August 13, 2021 at 11:57 pm | Reply

    Now I suggest the next steps are 1. to broaden this to more factors in the ecology of the forests (also how diverse were the stuidied forests in the first place?). I say this before some enthousiasts take the results and start to cut down patches of forest, to have more edges. 2. to continu looking at dynamics and interrelation of factors, e.g. the role of grazers.

  2. stephen schaffer | August 14, 2021 at 7:13 am | Reply

    was it so unimportant to reveal the origins of the invasive species?

  3. Sserunjogi Robert | August 14, 2021 at 2:40 pm | Reply

    Are sure this will note invade other trees?. If it comes back contact me.

  4. It seems to me that the edge trees would have higher carbohydrate reserves due to less competition. The trees in the middle have to share soil resources with all its surrounding siblings.

  5. @stephen shaffer: 🙂

    Looks like someone needs to rename the article at some point..

  6. Seems we have a politically-incorrect moth.

  7. Moth Shakers.

  8. These were a problem when I was a kid in the 70’s. Why is it taking so long to do something about it.

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