High Tunnel

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Updated: December 1, 2021

Urban Agriculture Grower Meetings

A list of meetings for Urban Agriculture growers.
Cultivate Baltimore: Hand-scale farm tools at Strength to Love 2 in Baltimore, City, August 15, 2019
Updated: October 29, 2021

High tunnel best management practices

High tunnels (or hoop houses) extend the growing season for specialty crops. This article will help growers learn how to get the most out of their high tunnel by adopting best management practices for temperature management, soil and growing media monitoring, safety considerations, pest management, and crop selection.
High tunnel
Updated: September 15, 2021

Old News But It Pays To Clean Up Your High Tunnel In The Off-Season

I know growers are very aware that they should clean up their vegetable fields and high tunnel (HT) of old crops and weeds during the off-season. I also know that growers have many other things that need to be done during this time and they can’t quite get to the cleaning. But spending some time now thoroughly cleaning up a high tunnel that is no longer in production rather than letting it sit over the winter will vastly improve your pest problems for the next year.
Soluble salt damage to peppers in a high tunnel
Updated: September 15, 2021

High Soluble Salts a Problem in Some High Tunnels

Over the years several high tunnel (HT) growers have complained to me about how after 4-5 years of growing various vegetables (although tomatoes were the most grown) in their high tunnel they are seeing poorer yields and ‘unthrifty plants’. This seems puzzling because they have put a great deal of compost in their HT and the soil looks great. The problem I think is high soluble salts in the soil which will damage overall plant fitness and yield.
Soluble salt damage to peppers in a high tunnel
Updated: September 15, 2021

Ethylene Problems in a Few Vegetable High Tunnels

Last week Gordon Johnson had an article about exhaust problems for greenhouse transplants. In Maryland we have seen a few problems with ethylene interactions with tomatoes in high tunnels. Ethylene (C2H4) occurs in trace amounts in gasoline and natural gas and is produced when these substances are burned. It also is present in wood and tobacco smoke.
Updated: September 15, 2021

Cold Damage to High Tunnel and Greenhouse Vegetables

Last week Gordon Johnson had an article talking about cold damage to peas and there also has been some cold damage and weather induced damage to vegetables in high tunnels and greenhouses.
Cold damage to tomato plants
Updated: September 15, 2021

Black Dot Root Rot - Seldom Seen Tomato Disease Found in High Tunnel

A root disease that is most commonly associated with potato has turned up on tomato in a high tunnel last week. This disease goes by the delightful name of black dot root rot. The causal agent is Colletotrichum coccodes, which also causes anthracnose fruit rot on tomato (sunken, water-soaked, circular lesions).
Updated: September 14, 2021

Odd Damage to Greenhouse Watermelon Transplants

There have been several reports of odd looking damage to watermelon transplants being grown in greenhouses these past couple of weeks. The damage does not appear to be cold damage per se, but more of a strange environmental/weather one. Watermelon transplants, along with some other vegetables, began showing dark pitted lesions on their cotyledons (fig. 1).
Watermelon cotyledon leaves with brown lesions
Updated: September 14, 2021

Edema Problem in Greenhouse Tomatoes

An odd problem was seen in tomato plants being grown for harvest in a greenhouse that showed blister- or callus-like growths usually along veins that first appeared on the underside of older leaves (fig. 1). Leaves also showed unusual curling and other odd distortions on the top side of the leaf (fig. 2).
Updated: September 14, 2021

Problems with Pollination in High Tunnel Tomatoes

Over the last month I have received reports from high tunnel (HT) growers that were seeing flower abscission due to poor pollination in their tomatoes (fig. 1). Some of these reports were a few weeks ago and others were just this past week. There are unfortunately several factors that can cause poor pollination in tomatoes.
Tomato cluster