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Phytophthora on annual vinca in greenhouses

Tue, May 9th, 2023, created by Jean Williams-Woodward
Phytophthora crown rot and foliar blight, caused by Phytophthora nicotianae, was recently seen on annual vinca (Catharanthus roseus) within greenhouse production...

Propagation Reminders: Poinsettia and Fall Garden Mums

Thu, May 4th, 2023, created by W. Garrett Owen
Though its early-May, it’s not too early to start thinking about poinsettia and/or fall mum propagation...

A Snapshot of Native Plant Growers In the U.S.

Thu, Apr 27th, 2023, created by Alicia L. Rihn
In 2022, I had the opportunity to dive deep into production factors that native plant growers use and how that compares to firms growing and selling non-native plants in the U...

Uneven Lettuce Growth in NFT Systems

Wed, Apr 19th, 2023, created by Roberto Lopez
Regardless of the material you use to germinate your lettuce seedlings, it is important that rooted seedlings make contact with the water in a nutrient film technique (NFT) system...

Irrigation Management for Iron Management

Wed, Mar 29th, 2023, created by Brian Whipker
Water management can be a challenge as plants mature and warmer greenhouse conditions occur. In order to try to avoid drought stress, it is easy to irrigate more frequently...

Biocontrol Agent Failures Can be Linked to Past Pesticide Applications

Thu, Mar 23rd, 2023, created by Thomas Ford
Vegetable production in protected culture systems is growing exponentially in many communities as the demand for local year-round produce increases...

Pour-thru on Primula

Thu, Mar 16th, 2023, created by Roberto Lopez
During a recent grower visit, I noticed several primula plants that had begun to develop chlorotic foliage...

Such Bugs and Goblins! Another Thrips Threat

Thu, Mar 9th, 2023, created by Dan Gilrein
Apparently unexpected new pests have been appearing even since Shakespeare’s time. One popping up in recent discussions, Thrips parvispinus, was new to continental North America when first reported from Florida on Anthurium and Hoya in 2020...

In-store Signs – What Draws the Eye?

Thu, Mar 2nd, 2023, created by Alicia L. Rihn
Customers are bombarded with a lot of information while shopping for goods. The same is true in the ornamental horticulture industry...

Increasing Daily Light Integral Improves Vegetable Transplant Quality

Thu, Feb 23rd, 2023, created by W. Garrett Owen
Vegetable transplants can be produced year-round for controlled-environment production; however, spring is the most popular season for greenhouse growers to produce vegetable transplants destined for retail garden centers and field production...

Gerbera: Distorted New Growth

Wed, Feb 15th, 2023, created by Brian Whipker
Around 5 gerbera plants were found in a commercial greenhouse with new leaves that were darker in color, thicker, and distorted...

Trouble with Tropicals? Join our March 16th webinar!

Thu, Feb 9th, 2023, created by Heidi Linberg
Mealybug, scale, and spider mites, oh my! Tropical plants often carry troublesome hitch-hikers. Join Michigan State University Extension and Dr...

Growth Control of Rooted Cuttings

Fri, Feb 3rd, 2023, created by W. Garrett Owen
The time to stick and propagate unrooted cuttings is here and so is the time to think about methods to control growth of rooted cuttings...

Test Your Irrigation Water Source This Spring

Thu, Jan 26th, 2023, created by Thomas Ford
Water is the most important input for greenhouse operators, yet it is also the input that is frequently taken for granted by growers until a cropping problem is observed...

Check Furnaces and Flues Before Putting Crops in the Greenhouse

Thu, Jan 19th, 2023, created by Thomas Ford
Some growers shut down their greenhouses in December after their poinsettias have been shipped to their final destination and will fire up their heaters/furnaces again for the first time in late January...

Bugger Off

Thu, Jan 19th, 2023, created by Brian Whipker
"Pest Resorts" is the best way to describe scattered weeds overwintering in the greenhouse. It amazes me when I inspect weeds in our greenhouses or at growers to find active colonies of spider mites, Western flower thrips, whiteflies or aphids...

Greenhouse Online Courses Open for Registration: Earn your Plant Health Professional Certificate

Wed, Nov 2nd, 2022, created by Heidi Linberg
Michigan State University Extension and University of Florida IFAS announced a collaborative training certificate program this past summer: the Plant Health Professionals (PHP) Certificate Program...

Optimizing Rosemary Fertility

Wed, Oct 19th, 2022, created by W. Garrett Owen
Rosemary (Rosmarinus officinalis L.) is a popular culinary herb and containerized greenhouse crop. To produce fresh cut rosemary or marketable containerized plants, growers must optimize the production environment and inputs such as mineral nutrition...

Cabbage Catastrophe: Dry Down

Tue, Oct 4th, 2022, created by Brian Whipker
Ornamental cabbage and kale are both popular fall crops and we are nearing the finish line in their production and marketing cycle...

Drop, Don’t Stop Ornamental Cabbage and Kale Fertilization

Tue, Oct 4th, 2022, created by Brian Whipker
Even during the coloration stage of ornamental cabbage and kale they are still growing and putting on new leaf growth...

Spotted spurge: A common weed of container production in nurseries and greenhouses

Mon, Aug 29th, 2022, created by Debalina Saha
           Euphorbia maculata (or Chamaesyce maculata) also known as spotted spurge or spotted sandmat, is a common broadleaf weed in container production in nurseries and greenhouses...

White Mold in Hydroponic Lettuce

Thu, Aug 18th, 2022, created by W. Garrett Owen
White mold is a disease caused by a fungal pathogen (Sclerotinia sclerotiorum). Although greenhouse food crops can become infected by this pathogen, it is uncommon and readily avoidable...

Troublesome Tradescantia

Thu, Aug 4th, 2022, created by Roberto Lopez
This Tradescantia ‘Nanouk’ began showing necrotic spots in early fall. Given that variegated foliage plants are sensitive to high EC, a pour through substrate test was performed...

Disease management is not just chemical usage

Tue, Jun 28th, 2022, created by Jean Williams-Woodward
Greenhouses are transitioning into fall crops with poinsettia and mum cuttings being rooted. It’s a good time to review sanitation, especially in propagation where Botrytis, Rhizoctonia and Pythium can cause significant losses...

Stranger on Hydrangea: Chilli Thrips

Thu, Jun 2nd, 2022, created by Dan Gilrein
I first heard news of chilli thrips (Scirtothrips dorsalis) tearing through southeastern US landscape roses and foliage plants soon after it was found in Florida in 2005...