February 2025 - 31

PLANT HEALTH
MANAGEMENT
Media, watering and fertilization
Pythium thrives in wet conditions that prevent proper
root development (Figure 3). In ebb and flow systems,
limiting the duration of irrigation can help reduce the
risk of root rot. The challenge lies in ensuring that there
is enough water for plant uptake while maintaining
sufficient air space (25%-50%) in the growing medium
to support healthy root growth. Poorly draining media
increases pythium damage. Decomposed peat, coir,
or rice hulls retain more water, and are particularly
conducive to pythium infection compared to lighter,
non-decomposed mediums.
Figure 2a. As the pythium
infection progresses, roots
appear watersoaked and tips
become discolored.
Figure 3. Pythium thrives
in wet conditions that
prevent proper root
development.
Excess water also provides a breeding ground for
pests like shore flies and fungus gnats, which can feed
on roots, providing an entry for pythium. Fungus gnats
and shore flies also act as vectors for pythium -
controlling these pests is an important component for
successful pythium management.
Additionally, high soluble salts from water quality
issues, excessive fertilizer or certain potting mixes can
burn root tips, providing easy entry points for pythium.
High nitrogen levels in fertilizers can also suppress
the plant's natural defense mechanisms, making it
more susceptible to infection. Managing salt levels and
maintaining a soil pH around 5.5 promotes plant growth
while suppressing pythium.
Sanitation
Sanitation is one of the greatest challenges in managing
Figure 2b. Stem rots and foliar
blight from pythium happen
when conditions are favorable.
pythium, and even the cleanest greenhouses can be
affected. Pythium spreads easily through contaminated
tools, containers or proximity to infected plants or media.
All surfaces, including benches, trays, containers and tools
that will contact the potting mix should be thoroughly
GREENHOUSE PRODUCT NEWS 31

February 2025

Table of Contents for the Digital Edition of February 2025

Table of Contents
Editor's Report
2025 California Spring Trials | Turn over a new leaf
CEA | Regulating crops in a controlled space
Grower Profile | North Carolina Farms
Variety Information | Poinsettia Variety Day 2024
Plant Health | Poinsettia protection
Technology | Taking control
Dr. Bugs | Life cycles of insect and mite pests
Technically Speaking | Getting the most out of energy and shade curtains
Culture Report | Heliopsis 'Burning Hearts'
Forty Under 40 Perspectives | A day in the life of plant protection
Product Marketplace
Classifieds/Ad Index
February 2025 - 1
February 2025 - 2
February 2025 - Table of Contents
February 2025 - Editor's Report
February 2025 - 5
February 2025 - 6
February 2025 - 7
February 2025 - 2025 California Spring Trials | Turn over a new leaf
February 2025 - 9
February 2025 - 10
February 2025 - 11
February 2025 - CEA | Regulating crops in a controlled space
February 2025 - 13
February 2025 - 14
February 2025 - 15
February 2025 - Grower Profile | North Carolina Farms
February 2025 - 17
February 2025 - 18
February 2025 - 19
February 2025 - 20
February 2025 - 21
February 2025 - 22
February 2025 - 23
February 2025 - Variety Information | Poinsettia Variety Day 2024
February 2025 - 25
February 2025 - 26
February 2025 - 27
February 2025 - 28
February 2025 - 29
February 2025 - Plant Health | Poinsettia protection
February 2025 - 31
February 2025 - 32
February 2025 - 33
February 2025 - Technology | Taking control
February 2025 - 35
February 2025 - 36
February 2025 - 37
February 2025 - Dr. Bugs | Life cycles of insect and mite pests
February 2025 - 39
February 2025 - Technically Speaking | Getting the most out of energy and shade curtains
February 2025 - 41
February 2025 - Culture Report | Heliopsis 'Burning Hearts'
February 2025 - 43
February 2025 - Forty Under 40 Perspectives | A day in the life of plant protection
February 2025 - 45
February 2025 - Product Marketplace
February 2025 - 47
February 2025 - 48
February 2025 - 49
February 2025 - Classifieds/Ad Index
February 2025 - 51
February 2025 - 52
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https://www.nxtbook.com/greatamericanmediaservices/GPN/new-varieties-digital-guide-2024
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-hemp-production
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-april-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-march-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2019
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