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eGRO Alerts

Since February 2012, some of the most respected horticultural authorities have been producing easily accessible pdf informative news alerts that let growers know of insect, disease, nutritional, environmental, or physiological growth situations that are occurring, making sure growers know what to be on the look out for every growing season.

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Volume 10 (2021)      

Pansy problems: Leaf spot, powdery mildew, and Myrothecium crown rot

10.38 - Pansy problems: Leaf spot, powdery mildew, and Myrothecium crown rot

Pansies and violas are affected by numerous plant diseases including black root rot, Pythium root rot, powdery mildew, Botrytis blight, and Cercosporaleaf spot. During the winter and spring of 2020, there was also a major problem with Myrothecium crown rot.

Read Alert 10.38

Unusual Leaf Spot on Poinsettia

10.37 - Unusual Leaf Spot on Poinsettia

While not commonly encountered on poinsettias, Corynespora cassiicola can cause brown leaf spots on leaves and bracts in conditions of high moisture and high humidity.

Read Alert 10.37

Poinsettia Leaf and Stem Abnormalities

10.36 - Poinsettia Leaf and Stem Abnormalities

Given that poinsettias are propagated during the hottest months of the year and have a very long production time, they are prone to several pathogens, pests, and physiological disorders.

Read Alert 10.36

 Dodder (Cuscuta spp.):  Orange, spaghetti-like growth

10.34 - Dodder (Cuscuta spp.): Orange, spaghetti-like growth

Dodder is a parasitic weed with orange, spaghetti-like growth that entwines around plants.

Read Alert 10.34

Ornamental Cabbage and Kale Water Stress

10.33 - Ornamental Cabbage and Kale Water Stress

Excessive wilting of the plants will result in lower leaf yellow and leaf drop.

Read Alert 10.33

Ornamental Cabbage and Kale Coloration Tips

10.32 - Ornamental Cabbage and Kale Coloration Tips

Coloration of ornamental cabbage and kale is primarily influenced by temperature. A few production practices can help enhance the intensity of coloration, but discontinuing fertilization is not one of them.

Read Alert 10.32

Summer Weather Patterns Can Influence Irrigation Water Quality

10.31 - Summer Weather Patterns Can Influence Irrigation Water Quality

Weather conditions and drought can affect the quality of your irrigation water. Increased alkalinity levels in your irrigation water may be linked to water use.

Read Alert 10.31

Root Rot in Garden Mums

10.30 - Root Rot in Garden Mums

Small and off-color mums may be a sign of root rot.

Read Alert 10.30

Plants Gone Crazy

10.29 - Plants Gone Crazy

What is fascinating with fasciation?

Read Alert 10.29

Garden Mums: Crown Buds Induced by Cool Night Temperatures

10.28 - Garden Mums: Crown Buds Induced by Cool Night Temperatures

Fall garden mum production typically occurs outdoors exposing plants to seasonal environmental conditions. When plants are exposed to several nights of <60 °F (<15.5 °C), premature bud formation or crown buds can be induced.

Read Alert 10.28

The green you do not want in the greenhouse: Algae

10.27 - The green you do not want in the greenhouse: Algae

Brief description: A review about practices and products to control algae in greenhouses.

Read Alert 10.27

White Rust on Portulaca

10.26 - White Rust on Portulaca

White rust is not a true rust nor a fungal disease. It is an oomycete disease, and it was recently seen infecting moss-rose purslane (Portulaca grandiflora) in hanging baskets.

Read Alert 10.26

Taking a More Holistic Approach to Fungus Gnat Management

10.25 - Taking a More Holistic Approach to Fungus Gnat Management

Fungus gnats can impact crop quality and spread Pythium in greenhouses

Read Alert 10.25

Pandemic Assistance Programs for Greenhouses and Nurseries

10.24 - Pandemic Assistance Programs for Greenhouses and Nurseries

Nearly all floriculture and nursery operations have been impacted by the pandemic. Learn more about USDA programs that can assist producers in challenging times.

Read Alert 10.24

Leaf-Curling Plum Aphid: A Pest to Watch

10.23 - Leaf-Curling Plum Aphid: A Pest to Watch

Leaf-curling plum aphid, Brachycaudus helichrysi, can cause distortion, stunting of new growth on plants in the Asteraceae.

Read Alert 10.23

White Mold (Sclerotinia) on Coleus

10.22 - White Mold (Sclerotinia) on Coleus

Description: Coleus plants with white cottony-like growth, stem and leaf rot, and small, hard, black sclerotia were observed. This Alert describes and provides photos of symptoms observed on coleus caused by white mold (Sclerotinia sp.) also referred to as Sclerotinia stem rot or cottony soft rot. To diagnose white mold, submit plant samples to your preferred diagnostic lab.

Read Alert 10.22

Scouting and Treatment of Gray Mold in Greenhouse Crops

10.21 - Scouting and Treatment of Gray Mold in Greenhouse Crops

Peak color in the greenhouse coincides with cloudy, damp weather that creates a favorable environment for the fungus Botrytis cinerea, which causes gray mold on many greenhouse ornamentals. This Alert provides tips for scouting and management of gray mold and gives an example fungicide treatment plan for when disease pressure is high.

Read Alert 10.21

Begonia and Vinca Sensitivity to Paclobutrazol

10.20 - Begonia and Vinca Sensitivity to Paclobutrazol

Plant growth regulators (PGRs) can be successfully used to control growth or induce lateral branching of many bedding plant species, but some may be ‘sensitive’ to the PGR active ingredient. This Alert demonstrates PGR sensitivity for fibrous begonia and vinca where an accidental paclobutrazol drench application resulted in stunted plants, chlorotic (yellowing) leaves, and black spotting.

Read Alert 10.20

Prevent Chilling Injury

10.19 - Prevent Chilling Injury

The pandemic, coupled with the cold winter has consumers demanding annuals, herb, and vegetable transplants weeks before the last average frost date. As growers, you obviously want to cash in and take advantage of these impulse purchases. But we all know this is risky! What can you do to prevent losses during those unpredictable cold snaps that occur in April and even into May? In this alert, we will provide some tips on how to protect your crops and provide you with a list of cold hardy plants you should be selling.

Read Alert 10.19

GR Drenches for Growth Control

10.18 - GR Drenches for Growth Control

Trying to control the growth of all your different spring crops can be a challenge. With so much diversity in our greenhouses, heads can spin trying to keep growth regulated effectively and efficiently. Using PGR drenches can help you this spring, and this Alert will focus on how to do it effectively.

Read Alert 10.18

Lily Basal Rot

10.17 - Lily Basal Rot

Lily basal rot caused by Fusarium oxysporum f. sp. lilii can cause crop losses in Easter Lilies.

Read Alert 10.17

Plant Disease Resistance, Reviewed

10.16 - Plant Disease Resistance, Reviewed

Defining and understanding plant resistance, susceptibility, immunity.

Read Alert 10.16

Troubleshooting Ipomoea

10.15 - Troubleshooting Ipomoea

Warm season annuals such as ipomoea can be challenged with cloudy weather.

Read Alert 10.15

Ask an Entomologist

10.14 - Ask an Entomologist

With the pandemic has come even greater demand for diagnostic lab support. Read about some recent issues and what some entomologists do to support our horticulture industries.

Read Alert 10.14

Bacterial leaf spot diseases are prevalent in wet greenhouses

10.13 - Bacterial leaf spot diseases are prevalent in wet greenhouses

Wet, humid, overcast weather outside favors plant disease development inside greenhouses because plant foliage and soil remain wet for extended periods of time. Plant wetness within warm greenhouses coupled with young, succulent seedlings and cuttings in production is a recipe for disease development, particularly bacterial leaf spots diseases, which have been widely seen within greenhouses affecting bedding and foliage plants.

Read Alert 10.13

Cashing in on the Top Four Gardening Motivations of 2020

10.12 - Cashing in on the Top Four Gardening Motivations of 2020

The spring of 2021 is here! During 2020, despite a very difficult start, many plant retailers had an excellent year – even record-breaking. Why?

Read Alert 10.12

Interpreting Water Quality Analysis Reports

10.11 - Interpreting Water Quality Analysis Reports

The quality of irrigation water is crucial to develop nutrient programs that are compatible with the crops’ needs. In this Alert, we will discuss how to interpret the water quality analysis reports to evaluate chemical aspects of water quality that affect nutrient programs.

Read Alert 10.11

PourThru Method for Large Containerized Crops

10.10 - PourThru Method for Large Containerized Crops

The PourThru method is a great procedure to determine the nutritional status of containerized crops. This Alert outlines the steps need to perform a PourThru on larger containers for mix combination planters, herbaceous perennials, and nursery and specialty crops.

Read Alert 10.10

Sampling Irrigation Water for Routine Lab Analysis

10.09 - Sampling Irrigation Water for Routine Lab Analysis

Irrigation sampling is an important nutrient monitoring practice to determine water quality such as pH, electrical conductivity (EC), alkalinity, and available dissolved nutrients. Assessing irrigation water quality will help refine alkalinity management and fertility programs and define limited or excessive nutrients for the appropriate corrective procedure.

Read Alert 10.09

_Elevated EC Symptomology

10.08 - _Elevated EC Symptomology

Lower leaf necrosis can develop in stevia if the substrate electrical conductivity (EC) is elevated.

Read Alert 10.08

Stevia: High Substrate pH

10.07 - Stevia: High Substrate pH

Stevia can develop interveinal chlorosis of the upper foliage if the substrate pH is too high.

Read Alert 10.07

Calonectria root, crown, and cutting rots are less common, but just as damaging

10.06 - Calonectria root, crown, and cutting rots are less common, but just as damaging

Besides the more common pathogens causing root disease in greenhouse crops, there are other lesser known but equally destructive pathogens affecting specific crops. One example is Calonectria spathiphylli that causes root and petiole rot of Spathiphyllum. Other Calonectria sp. cause root, crown, and cutting rots on woody and herbaceous plants.

Read Alert 10.06

Aphids in Unexpected Places

10.05 - Aphids in Unexpected Places

Over the past year I had some interesting samples of and questions about aphids, so as winter transitions to spring I’ll use the opportunity to review some of the less common species we’ve encountered in greenhouses over the years while issuing the standard reminder to watch for early signs and respond while infestations are still small in size and area.

Read Alert 10.05

Who Said That Pansies Were Easy?

10.04 - Who Said That Pansies Were Easy?

Pansies would seem to be an uncomplicated or easy crop….but then the leaves started to yellow…..

Read Alert 10.04

Powdery Mildew on Succulents Is Not What You Would Expect

10.03 - Powdery Mildew on Succulents Is Not What You Would Expect

Powdery mildew on succulents can appear more like sun scald or edema. In this alert, we will show you what to look for and the fungicides labeled to treat powdery mildew. Remember, when in doubt, submit a sample to a diagnostic lab for confirmation.

Read Alert 10.03

PGR Guide for Annuals

10.02 - PGR Guide for Annuals

The 72-page Plant Growth Regulator Guide for Annuals publication has been updated for the 2021-2022 season.

Read Alert 10.02

Sampling Substrates for Routine or Diagnostic Lab Analysis

10.01 - Sampling Substrates for Routine or Diagnostic Lab Analysis

Substrate sampling for routine or diagnostic lab analysis is an important nutrient monitoring practice to assess substrate chemical properties including pH, soluble salts, and nutrient status.

Read Alert 10.01

Volume 9 (2020)      


Volume 8 (2019)      


Volume 7 (2018)      


Volume 6 (2017)      


Edible Alerts      


Volume 5 (2016)      


Volume 4 (2015)      


Volume 3 (2014)      


Volume 2 (2013)      


Volume 1 (2012)