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Watch Those Temperatures

Chuck Bornt, Team Leader, Extension Vegetable Specialist
Eastern New York Commercial Horticulture

May 9, 2018

Just another reminder that even though we haven't reached really concerning temperatures yet, temperatures in high tunnels, crops under rowcovers or especially those under clear plastic hoops (such as sweet corn) can get very hot on these gorgeous bright sunny days!   For sweet corn, the larger the plant under that plastic the greater the risk of injury is.  If it gets too hot under that plastic, consider piercing the plastic with a pitchfork or setting up and running the irrigation to cool the soil and plastic.  If it looks like we are in for a long warm stretch, you might consider slitting the plastic and removing it altogether.  The one benefit of using floating rowcovers on sweet corn compared to plastic is you don't have to worry about it getting too hot as the rowcovers naturally breathe and are cooler.  The following information is from Dr. Steve Reiners of Cornell University Department of Horticultural Sciences and can be used as a guide to know when to remove covers before it's too late! 

 "Most of the published temperature guidelines list maximum temperatures at which either vegetative growth becomes limited or reproductive capabilities are threatened, i.e. flowers or fruit fall off. Temperatures at which vegetable plants may die varies and depends not only on the vegetable type but also on other factors such as whether irrigation is being provided or for how long the high temperature occurs.  Also, a transplant will be under much greater stress than a plant that is direct seeded. 

The following table lists temperatures at which severe stress will occur, possibly death, especially if soil moisture is low.  These temperatures refer only to potential crop death.  Temperatures 15 to 20F lower than those listed in the table will result in the loss of flowers and fruit and will negate the positive effects of early warming under row covers."

image 1Chart with various vegetables
image 2Row cover


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

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Announcements

U-Pick Farm Practices During Covid-19 Pandemic

U-Pick is a critical direct marketing approach for many of our farms and provides
customers with a unique connection to fresh produce grown close to home. In light
of what we understand about the spread of COVID-19, new management practices
will be needed to protect your farm team and your customers. This document
provides recommended practices and communication strategies for U-Pick
operations for the 2020 season.

https://rvpadmin.cce.cornell.edu/uploads/doc_864.pdf

Growers-are you running low on fall pumpkins, etc?

The Produce Auctions located around the state may have what you need.  Check out all of the opportunities here: https://harvestny.cce.cornell.edu/submission.php?id=4

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

Onion Thrips and Onion Maggot Management Recommendations with Dr. Brian Nault

May 26, 2021
Onion Thrips and Onion Maggot Management Recommendations with Dr. Brian Nault

Cornell University vegetable entomologist Dr. Brian Nault discusses recommendations for managing onion thrips in 2021 with specialist Ethan Grundberg. Nault and Grundberg review basic principles of resistance management, using action thresholds to time insecticide applications, and season-long pesticide programs for managing thrips before discussing how the upcoming chlorpyrifos ban in New York will impact seedcorn and onion maggot management in 2022 and beyond.

Resources:

Onion Thrips Insecticide Program Flow Chart from Dr. Brian Nault: https://rvpadmin.cce.cornell.edu/uploads/doc_980.pdf

NEWA Onion Maggot Emergence Model: http://newa.cornell.edu/index.php?page=onion-maggot

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