Forestcast

In season one of Forestcast , entomologists showed us the ways we slow insects from attacking and killing trees. This season, we'll meet another set of scientists, scientists who have been attacking the issue of non-native invasive insects and pathogens from a different angle. Chemicals and biological control can buy trees time, but they cannot completely control the non-native insects that are at...

Mac Callaham, a research ecologist, goes searching alone in Georgia's Chattahoochee National Forest for one of Brood X's most-southern cicada emergences. Scientist: Mac Callaham , Research Ecologist, Southern Research Station, Athens, Georgia Produced by the USDA Forest Service Northern Research Station . Questions or ideas for the show? Connect with Jon at: jonathan.yales@usda.gov

Any day now, periodical cicadas will emerge across 15 states stretching from Illinois to New York and northern Georgia. Two scientists, one who's tracked the aboveground movements of these cicadas, and another who's unearthed the belowground impact of these insects, take you inside the many mysteries and forgotten elements of these evolutionary enigmas. Related Research: Sharp boundary formation a...

In the 1970s, red spruce was the forest equivalent of a canary in the coal mine, signaling that acid rain was damaging forests and that some species – especially red spruce – were particularly sensitive to this human induced damage. In the course of studying the lingering effects of acid rain, scientists came up with a surprising result – decades later, the canary is feeling much better. Related R...

In addition to studying and monitoring the non-native insects already here, scientists are monitoring pests that have potential to become problems if they ever do arrive, whether from overseas or from other parts of North America. Related Research: " The Challenge of Modeling and Mapping the Future Distribution and Impact of Invasive Alien Species " (2015) " Reproduction and potential range expans...

The Asian longhorned beetle has the makings of a disaster pest poster — a wide possible geographic and climatic range, a number of host trees, and few control options. Lucky for us, it just doesn't seem to spread far on its own. There are biocontrol and predator options, but nothing is ideal, or especially effective. At this time, there isn't much we can do other than chop down and chip infested t...

With no parasitic wasps — like we have for emerald ash borer — and no miracle fungal pathogen — as with gypsy moth — our control options for the nonnative insect threatening Eastern hemlock forests, the hemlock woolly adelgid, have been tricky. Hemlock forests, and the hemlocks in your yard, are paying the price. Related Research: " Hemlock Woolly Adelgid: A Non-Native Pest of Hemlocks in Eastern...

Insect biological control comes in all shapes and sizes — parasitoids, predators, or pathogens. So, what happens when neither a parasitoid nor a predator are feasible? Well, sometimes we have to turn away from using insects to attack insect pests, and turn to using an even smaller organism, something microscopic: a pathogen — in this case a fungus. Related Research: " Introduction and Establishmen...

With global trade and travel, organisms are moved around easily and abruptly, causing biological invasions. What's our best hope to combat these rapidly spreading pests? Sometimes, it's to do the exact same thing, to start moving around organisms — on purpose — to attack unwanted pests. This is called 'biological control.' It is one of the most cost-efficient and environmentally acceptable long-te...

A biological invasion is an enormous increase in population of some kind of living organism. It happens when an organism — like an insect — arrives somewhere beyond its previous range, when it breaks out past its natural barrier, unbalancing the biological order. More than 450 non-native insects have invaded our forests and urban trees since European settlement. In this series, we'll explore four...

The Northern Research Station invites you inside the largest forest research organization in the world — the USDA's Forest Service — for conversations with scientists at the forefront of forest research. Forestcast brings you stories, interviews, and special in-depth anthologies of the science that's examining and explaining how forests affect our lives, and how we affect our forests. To kick thin...