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Responding to Hailstorms

Crystal Stewart, Extension Vegetable Specialist
Eastern New York Commercial Horticulture

June 26, 2013

Responding to Hailstorms
Preparing for hail: There are some normal maintenance activities that will also benefit your plants in the event of a hailstorm. The use of rowcovers may help to diffuse the impact of hailstones and reduce injury to plants, especially when using rowcover and hoops. When deciding how long to leave those covers on, or whether to put them on your later plantings, this is a factor to consider. However, we have also seen rowcovers completely removed by the high winds that can precede hail, so this is certainly not a fail-safe.
The second precaution which will help in the event of hail is the application of a preventative fungicide such as copper or chlorothalonil. Although these products are not rain-fast, we have found that they still help reduce incidence of fungal and bacterial infections from hailstorms.

After hail: The damage left by hail varies tremendously based on the size and shape of the hailstone, the wind velocity of the storm, and the duration of the hail event. Deciding how to respond is really case-by-case. Two farms right next to each other can experience very different levels of damage. However, there are some rules of thumb that generally hold true.

1) Cucurbits are going to look really bad but are likely to recover. Those huge leaves tend to tatter very dramatically during hail, and can look absolutely awful. However, the leaves can also help to protect the growing points, which largely determine whether a plant will recover or not. Generally cucurbits that are old enough to have an established root system and have intact growing points will be able to generate new leaves very quickly and will begin producing fruit within a couple of weeks. To facilitate this process, give some extra nitrogen through the drip system.  Pick and remove summer squash fruit that were damaged by hail if you can.

2) All plants will benefit from a protective fungicide application. After hail, plants have hundreds of small (or large) wounds which leave them extremely vulnerable to diseases. As soon as you can get on the field, apply a protectant such as copper or chlorothalonil (copper will protect from bacterial and fungal diseases so is the better option), even if you applied one before the storm. This will help prevent infection while the plant heals up those wounds.

3) Incidence of bacterial rot in onions is going to increase. We tend to see many more issues with onion storage following hail. Copper may help somewhat, but results have been mixed to poor. 

Deciding what to do with tomatoes can be tricky. According to Dr. Reiners, determinate varieties suffering from moderate to severe damage (think of snapped branches and stripped leaves-Image 1) are most likely to be lost causes because by the time they recover they will practically be at the end of their lives. It is best to pull plants at this threshold out. Indeterminate tomatoes have a better chance of recovering from hail. All fruit which was hit will be relegated to seconds at the very best. Damage can vary greatly by variety because of the differences in canopy cover, so assess each separately. Last year we saw Primo Reds that were a complete loss next to Amish Paste tomatoes which were about 80% ok.

On plants with heavy foliage such as corn and sweet potatoes, a foliar feeding including nitrogen and some micronutrients may be beneficial. Remember that you have to have intact foliage to spray for this to be effective.

Once you have done everything you can to clean up and protect your plants, it is often best from a mental health standpoint to walk away for a few days up to a week. There is a small period of time where this is nothing more to do but let the plants recover. Nice time for a mini vacation. Really.

As always, if you would like help deciding what to do after hail or any other weather event, please give us a call.

 



more crops
Apples

Apples

Apricots

Apricots

Asparagus

Asparagus

Beets

Beets

Blueberries

Blueberries

Broccoli

Broccoli

Brussels Sprouts

Brussels Sprouts

Cabbage

Cabbage

Carrots

Carrots

Cauliflower

Cauliflower

Cherries

Cherries

Cucumbers

Cucumbers

Dry Beans

Dry Beans

Eggplant

Eggplant

Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

Grapes

Grapes

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

Nectarines

Nectarines

Onions

Onions

Parsnips

Parsnips

Peaches

Peaches

Pears

Pears

Peas

Peas

Peppers

Peppers

Plums

Plums

Potatoes

Potatoes

Pumpkins / Gourds

Pumpkins / Gourds

Radishes

Radishes

Raspberries / Blackberries

Raspberries / Blackberries

Rhubarb

Rhubarb

Rutabaga

Rutabaga

Snap Beans

Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

Squash- Winter

Strawberries

Strawberries

Sweet Corn

Sweet Corn

Sweet Potatoes

Sweet Potatoes

Tomatoes

Tomatoes

Turnips

Turnips

more crops

Upcoming Events

Biocontrol Trial and IPM Field Meeting

August 20, 2019
4pm-6pm
Fort Plain, NY

4-5 pm: Dr's Amara Dunn and Meg McGrath will discuss powdery mildew control using biocontrols and organic and conventional fungicides.  Crystal Stewart from the ENYCHP will provide a tour of the biocontrol trial and additional squash and pumpkin mini-variety trial.

5-6pm: Walk the farm fields with Dr's Dunn and McGrath and with CVP specialist Elizabeth Buck to talk about integrated strategies to control pests, diseases, and weeds on the vegetables farm.  Bring samples and questions!

6-?pm: Discussion and light refreshments 

*Look for the CCE sign to park on a cross street right before the farm.

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Ag Manager Webinar Series: Ag Tax Topics - Sales Tax and Property Tax Issues for Ag in NYS

August 27, 2019
12:30 - 12:50pm

Join Liz Higgins from the CCE ENYCHP every other Tuesday at 12:30pm throughout the summer as she discusses pertinent business topics for busy farm managers.
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Willsboro Farm High Tunnel Twilight Meeting

August 27, 2019
5:00pm - 7:00pm
Willsboro, NY

Join vegetable specialists Elisabeth Hodgdon, Jud Reid, and farm manager Mike Davis for a high tunnel and field tour at Cornell's Willsboro Research Farm, where they will share research results for the following projects: 
  • Striped cucumber beetle management suing netting and row cover
  • Varietal differences in cucumber susceptibility to striped cucumber beetle
  • Ground cherry and goldenberry production in field and high tunnel environments
  • Overwintered high tunnel spinach nitrogen fertility 

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Announcements

Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

Biweekly Vegetable News Podcast - Episode 8 - 08/07/19

August 7, 2019
The August 7th, 2019 edition of the Eastern New York Vegetable News covers the following topics:

Cover Crop Options for Late Summer (1:28)
Plectosporium and Angular Leaf Spot of Cucurbits (5:57)
Tomato Caterpillar Pests and a Late Blight Update (14:39)
New York State Bill to Eliminate the Use of Chlorpyrifos (22:25)
Basil Downy Mildew Management (24:04)
Garlic Anthracnose and Bacterial Issues in Onions Grown on Plastic (28:20)
Offering Retirement Benefits on the Farm (33:10)
Salt Water Flotation Test for Spotted Wing Drosophila (35:08)
Farm Labor Housing Update (39:45)

Here are links to additional resources mentioned in the episode:

Tomato Blight Alerts and Updates:
http://usablight.org/

Basil Downy Mildew
Dr. Meg McGrath: 631-727-3595 or mtm3@cornell.edu
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/BasilDowny.html http://blogs.cornell.edu/livegpath/extension/basil-downy-mildew/

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