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‘Camp Mushroom’ in N.Y. Times

Ken MudgeDo-It-Yourself Mushrooms, a feature in this morning’s Home and Garden section of the New York Times, chronicles the growing interest in home-scale mushroom production. The article quotes Ken Mudge on the prospect of commercial-scale production:

For five years, Ken Mudge, an associate professor of horticulture at Cornell University, has been leading an annual mushroom cultivation weekend at the university’s Arnot Teaching and Research Forest. He calls it Camp Mushroom.

Mr. Mudge believes that mushrooms are an ideal market crop for Northeast farmers, and others who own small and neglected forest lots. Fresh shiitakes fetch around $16 a pound at a farmers’ market, he said.

Those delicacies represent a bargain, he argued, compared with month-old grocery store slop. “I would describe that stuff as looking like shoe leather,” he said.

This year’s Camp Mushroom, which takes place on Friday and Saturday, filled up fast, as usual, Mr. Mudge said. But he has plans to add three more seminars to meet the growing demand.

Mudge is also teaming up with the University of Vermont are embarking on a 3-year, SARE-funded project for farmers and other forest owners who are interested in growing shiitake mushrooms as a money-making enterprise. Together with experienced shiitake growers from New York, New Hampshire and Vermont, the collaborators are developing a program that will help aspiring growers to not only learn how to grow shiitake mushrooms from A to Z, but also help them decide if they want to get into Shiitake farming on a commercial scale. Read more about the project.

Dreer Seminar video: Vertical Greening Systems

green_wallOn April 5, Stephanie Gautama, B.S. Landscape Architecture ‘09, delivered her Dreer Award Lecture on Vertical Greening Systems. The annual award — which allows one or more students to spend 6 months to a year abroad pursuing related-horticulture interests — funded Stephanie’s 8-month quest to learn the state-of-the art on this hot hort topic.

Her research took her to meetings and internships in Zürich, Stockholm, Paris, Münich, Sydney, Melbourne and Singapore, working with researchers, designers and entrepreneurs of the growing vertical greening industry.

View video of Stephanie’s presentation below. Part 2 is here.

Vertical Greening Systems – Stephanie Gautama (Part 1 of 2) from Cornell Horticulture on Vimeo.

Avoid the late blight blues

Late blight symptoms on leaves and stems.  (Click image for larger view.)

Late blight symptoms on leaves and stems. (Click image for larger view.)

Click on images for larger views.
Photos by Meg McGrath. For more images, visit McGrath’s late blight photo gallery.

ITHACA, N.Y. — Last year, many broken-hearted gardeners in the Northeast were denied their cherished homegrown tomatoes when late blight – the same disease that triggered the Irish potato famine – wiped out their plants.

This year, gardeners can play a key role to help avoid a repeat of 2009.

“Anyone growing susceptible plants needs to take responsibility to ensure they don’t become a ‘typhoid Mary,’” says Meg McGrath, plant pathologist at Cornell University’s Long Island Horticulture Research and Extension Center, Riverhead, N.Y.

“We need to treat this like a community disease,” she adds. “If infested, even a small garden can have a devastating impact on other plantings.”

The good news for gardeners is that they are starting with a relatively clean slate this year. Phytophthora infestans, the fungus-like pathogen that causes late blight in tomatoes, potatoes and other tomato-family plants (Solanaceae), currently requires living plant tissue to survive overwinter in the Northeast. That’s why the disease is relatively rare in the region.

Late blight lesion on tomato leaf.  Click for larger view.

Late blight lesion on tomato leaf. Click for larger view.

The bad news is, potato tubers are living plant tissue. So any late-blight-infested potato tubers that survived in your soil, compost pile or root cellar could harbor the pathogen and give it an early start again this season.

“Destroy leftover potatoes and any volunteer potato plants as soon as they sprout,” McGrath urges. “Do not wait until you see symptoms. By then, new spores likely will have already developed and spread to other gardens or farmers’ fields.”

Infested potato tubers are usually the main source of the pathogen in the Northeast, says McGrath. But spores can also be carried by wind into the region from milder climates. Typically, these outbreaks occur later in the season, hence the name late blight.

When it's moist, the late blight pathogen produces spores.  Look for white fuzzy growth, especially on the underside of leaves.  (Another disease, Botrytis, produces gray spores.)

When it's moist, the late blight pathogen produces spores. Look for white fuzzy growth, especially on the underside of leaves. (Another disease, Botrytis, produces gray spores.)

And there is potentially worse news: If both mating types of the pathogen establish here in the Northeast, they can produce thick-walled spores that overwinter and survive several years in the soil without a living host. This has already happened in parts of Scandinavia and Europe, where late blight, as a result, occurs more commonly. While only one mating type was detected in the Northeast last year, both types appear now to be established in Florida.

Even though late blight cannot yet survive in the Northeast without a living host, it’s still a good idea to rotate crops and clean plant stakes and tomato cages to help prevent other diseases, suggests McGrath.

A range of symptoms on tomato stems from the small, irregular spots found early on to larger lesions to white spores formed under moist conditions.

A range of symptoms on tomato stems from the small, irregular spots found early on to larger lesions to white spores formed under moist conditions.

No silver bullet

One line of defense against plant diseases is to choose varieties that have some resistance to the disease. Researchers at North Carolina State University have developed two promising tomato hybrids – ‘Mountain Magic’ and ‘Plum Regal’. Both have excellent resistance to several strains of late blight. But seed of these hybrids is not expected to be widely available until 2011, says Tom Zitter, a vegetable disease specialist in the Department of Plant Pathology and Plant-Microbe Biology at Cornell University, Ithaca, N.Y.

Zitter has summarized observations and research on the late blight resistance of certain tomato varieties to strains of the disease that recently plagued the Northeast. (See chart, below.) But even if a variety is resistant to one strain of the disease, that doesn’t mean that it’s resistant to all strains, Zitter points out. While some are better than others, no potato varieties are highly resistant to late blight.

Late blight resistance of some tomato varieties
Excellent Good Moderate
Black Plum
Matt’s Wild Cherry
Mountain Magic*
Plum Regal*
Yellow Currant
Yellow Pear
Aunt Ginny’s Purple
Big Rainbow
Red Currant
Tigerella (aka Mr. Stripey)
Aunt Ruby’s German Green
Black Krim
Plum cluster
Pruden’s Purple
Red Pearl
*Seed available in 2011.
Adapted from Performance of Tomatoes for Late Blight (LB) and Early Blight (EB). T. A. Zitter, March 2010.

View full summary.

Also keep in mind that resistance doesn’t mean full immunity. “There’s no silver bullet,” says McGrath. “You still need to use other management practices and hope that disease pressure is low and the weather cooperates.”

10 tips to beat late blight

So what can gardeners do to minimize late blight in their own gardens – as well as reduce the chance of spreading it to others?

Kill volunteer potatoes. Dig up, bag and trash any potato plants that pop up in your garden or compost pile. It may take repeated efforts to get them all.

Buy healthy tomato plants. Learn what late blight looks like. (See For more information below.) If you spot any infected plants while shopping, alert store management and your local Cooperative Extension office, and buy your plants somewhere else. Or you can grow your own plants. (Late blight isn’t spread on tomato seeds.) Start seed about 6 to 8 weeks before your last frost date.

Use certified seed potatoes. Don’t use leftovers from last year’s garden or table stock from the grocery store.

Keep plants dry. The late blight pathogen thrives in cool, wet weather. That’s because it requires moisture to infect plants, grows best when it’s cool, and clouds protect spores from lethal UV radiation when they are dispersed by wind. Even in absence of rain, the pathogen can infect plants if the relative humidity is 90 percent or more. If plants need watering, water the soil – not the foliage.

Be vigilant. Inspect plants at least once a week – more often if weather is cool and wet. Immediately remove and bag foliage you suspect might be infected. While late blight symptoms are distinctive – dark brown lesions on stems and leaves with white fungal-like growth developing under moist conditions – it’s possible to confuse it with other diseases. Your local Cooperative Extension office can help you with identification. (See For more information below for links to more late blight images and Extension contacts.)

Act quickly. If symptoms continue despite removing infected foliage, consider removing plants entirely – sooner rather than later. “It is rarely possible to control late blight just by removing affected tissue,” says McGrath. “The longer you wait to remove plants, the more spores your garden sends to the wind to infect other gardens and farm fields.”

Sound the alert. If you find late blight in your garden, let your gardening neighbors and local Cooperative Extension staff know so they can warn others and be on the lookout for additional infestations. Make sure your neighbors know how to spot late blight in their own gardens.

Dispose of plants properly. To reduce disease spread, remove infected plants during the middle of a sunny day after leaves have dried, if possible. But don’t wait for these conditions. Seal plants in garbage bags and leave them in the sun for a few days to kill plants and the pathogen quickly before placing in the trash or burying underground or deep in a compost pile. Don’t just leave plants on the ground or on top of the compost pile where they will continue to be a source of spores until the plant tissue dies. With a large number of plants, you can build a pile on the ground and cover securely with a tarp until the plants die.

Keep an eye on other tomato-family plants. Some strains of late blight can infect other tomato-family plants, including weeds such as hairy nightshade and bittersweet nightshade. Control them early so that late blight on these plants doesn’t go unnoticed. Petunias and tomatillos are also vulnerable to attack.

Use fungicides with care. Fungicides can control late blight. (Chlorothalonil and copper-based products are both available to home gardeners.) But if you wait until late blight symptoms appear, it might be too late to rescue plants. For fungicides to work effectively on late blight requires a regular preventive spray schedule and thorough spray coverage. Follow all label directions, including use of respirator, waterproof gloves and protective eyewear.

For more information:

Dig Art! activities cultivate creativity

Dig Art! posterVia Christine Hadekel, Cornell Garden-Based Learning Program:

This garden season, Cornell Garden-Based Learning is excited to launch Dig Art! Cultivating Creativity in the Garden, our new online guide to garden arts.

Dig Art! provides helpful tips on everything from how to grow an art garden, to which kinds of plants to harvest for different natural dyes. You can find activities on making gourd birdhouses, flower mandalas, grass photographs, seed necklaces, concrete leaf castings, and more!

We provide helpful tips on how to lead these activities safely and sustainably with children and youth, and are currently linking all Dig Art! activities to the NYS learning standards (so to all those New York State teachers out there – stay tuned!)

To order your free Dig Art! toolkit (welcome letter, poster, activity cards) send an email to Max Welcome at with your name, organization, and contact information.

Visit the Dig Art! website.

ShortCUTT turfgrass podcasts back for 2010

ShortCUTT podcastsWith the return of the grass, turf specialist Frank Rossi has relaunched his weekly ShortCUTT podcast for lawn, golf course and sport turf professionals.

The podcasts feature pest alerts, expert advice, weather news for turf managers, observations from around the state, Rossi’s ‘Gazing in the Grass’ column, and more.

They are available via iTunes, RSS or Cornell Turfgrass blog.

This year, Rossi has also launched an interactive New York State Turfgrass Education Calendar using Google calendars.

For more information about the Cornell Turfgrass Program, visit the program’s website at

Weed Contest Volunteers Needed

On July 27, the Departments of Horticulture and Crop & Soil Sciences at Cornell will host the 2010 Northeastern Collegiate Weed Science Contest at the Homer Thompson Vegetable Research Farm, Freeville, N.Y.

The purpose of the contest is to provide an educational experience for students from universities in the Northeast and adjacent regions to broaden their applied skills in weed science. The contest provides an opportunity for weed science students to meet and talk with each other, be exposed to researchers from other universities and industry, and apply what they have learned. It is also hoped that the contest will increase the visibility of weed science and intensify the interest level of those participating in the discipline of weed science.

We have a record number of students planning to attend this year, from as far away as Florida and Canada and Midwest from Indiana. As you can imagine, it is no small feat to plan and orchestrate this annual event. We are looking for volunteers on Tuesday, July 27 to help our team of faculty and staff with this event. Tasks may include but are certainly not limited to proctoring students during weed or herbicide identification exams or working in teams to challenge students with ‘grower problems’.

If you would like to help out with this great educational event and receive a free lunch, please contact Larissa Smith at or 607-255-2177

Your willingness to volunteer is greatly appreciated

Toni DiTommaso, Russ Hahn, Robin Bellinder

More info about the contest.

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