GREAT LAKES HOPS

Hops BLOG

  • Home
  • Retail - Shop Now
  • Select Hops
    • Select Hops Program
    • Hop Sensory
    • Brew Group
    • Aztec™
    • Hydra™
    • Paradigm™
    • Bergamot™
    • Emerald Spire™
    • Gemini™
    • Mackinac™
    • Michigan Copper™
  • Select Hop Locator
  • Commercial Ordering
    • USDA Exclusive Hop Varieties >
      • Triumph
    • Availability
    • Commercial Contact
  • Hops Blog
  • Hops DOCS
  • FAQ

2/9/2013

The effects of High Temperatures on Hops Cultivars

Comments

Read Now
 
Here is a picture demostrating the effects of prolonged high air and soil temperatures from a controlled study  Brian and I did at Great Lakes Hops Lab . The hops were subject to a minimum temperature of 90 deg. F. - maximum 110 deg. F. regime for three weeks while emerging from dormancy. Photosynthesis pretty much shut down at leaf temperatures above 90 deg., resulting in chlorosis and reduced leaf size on most varieties. Other observations noted were :

 - Dropping  air temperatures below 90 for even 2 hours / 8 hour cycles markedly increase the leaf color.
 - Soil temperatures above 95 deg stopped fine root hair growth- adding to the chlorosis.
 - different varieties can tolerate high temperatures better than others
Picture
Effect of high temps on hop varieties Newport, Spalter Select, Challenger, and Santiam
Varieties Newport and Challenger both handled the heat well (Didn't even dis-color Challenger).  Santiam showed reduced growth, while Spalter Select really took a hit.

 Take away -??- The Western European varieties (German) Spalters, Hallertauers, Tettnangers are more sensitive to high air and soil temps than American varieties like Newport, Galena, Chinook, and  Cascade.  Spalter Select obviously cannot be grown like Newport.

This does not mean the former group can't be grown successfully - it means they have to be grown DIFFERENTLY. By "differently" I would suggest closer raised row and plant spacing to create cooler temperatures in the lower hopyard canopy, leaving more lower folige to shade the soil (especially in newly established hopyards), using aerial sprinklers to cool the leaves at mid-day, and mulching new plantings to reduce soil temperatures.

 I think is is a great example of how "one size does not fit all".

Share

Comments
Details
    Picture
    click here HOPS DOCS Collection - valuable info we find to share

    Blog Author

    Lynn, the head hop grower at Great Lakes Hops has over 30 years of experience in the horticultural field. Browse the blog articles here to find useful growing information for humulus lupulus, based on personal experience and observations at Great Lakes Hops.

    Archives

    January 2020
    December 2019
    November 2019
    September 2019
    July 2019
    April 2019
    July 2013
    May 2013
    February 2013
    December 2012
    November 2011
    October 2011
    September 2011

    Categories

    All
    Beer
    Bines
    Cholorine
    Fertilizer
    Fungicides
    Hops
    Hopyards
    Insecticides
    Pesticides
    Profiles
    Pruning
    Soil Testing
    Temperatures

    RSS Feed

​About Us​ - Contact - Employment​  © 2011 - 2019 Dutch Touch Growers, Inc.
  • Home
  • Retail - Shop Now
  • Select Hops
    • Select Hops Program
    • Hop Sensory
    • Brew Group
    • Aztec™
    • Hydra™
    • Paradigm™
    • Bergamot™
    • Emerald Spire™
    • Gemini™
    • Mackinac™
    • Michigan Copper™
  • Select Hop Locator
  • Commercial Ordering
    • USDA Exclusive Hop Varieties >
      • Triumph
    • Availability
    • Commercial Contact
  • Hops Blog
  • Hops DOCS
  • FAQ