The Twelve Diseases of Christmas Poinsettia and Their Cures

The Twelve Diseases of Christmas Poinsettia and Their Cures

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The poinsettia is a traditional plant associated with the holiday season. But how did that come about? Perhaps it was because Congress named December 12 as National Poinsettia day to honor the death of Mr. Joel Poinsett to encourage people to enjoy the beauty of the plant he introduced into the US. Perhaps, it was due to a Christmas miracle story. Flores de Noche Buena, or Flowers of the Holy Night, a charming story of a poor Mexican girl named Pepita whose bouquet of weeds burst into blooms of brilliant red as she offered them at a Nativity scene. Perhaps it was due to the technique developed by Paul Ecke to produce fuller plants. Today, the Paul Ecke Ranch in California produces over 70% of all poinsettias purchased in the United States and roughly 50% of worldwide sales. In the US alone potted poinsettias with nearly 50.5 million pots sold at a market value of $241 million (2014 USDA Census).

However, production of poinsettias as well as maintenance and propagation of your plants at home face a number of challenges. Biological problems include four bacterial diseases that can be caused by nine different pathogens, twenty-one fungal diseases caused by various fungi, one nematode, and one virus induced disease. Throughout our lives we have come across a few of these problems. We present our top twelve diseases of Christmas Poinsettia and how to deal with them. This is by no means a complete list of diseases and cures but is a list of the diseases you can easily recognize and the pesticides that we would try first before resorting to stronger chemistries or purchasing new poinsettias!

The Twelve Diseases of Poinsettia and Cures

Disease Pathogen Pesticide Class Trade Names

Gray Mold

Botrytis cinerea

Potassium bicarbonate

MilStop®

 

 

Streptomyces griseoviridis

Mycostop®

 

 

Bacillus subtilis QST-713

CEASE®

Serenade®

 

 

Streptomyces lydicus

Actinovate®

 

 

Pyraclostrobin +boscalid

Pageant®, Pristine®

 

 

Azoxystrobin

Heritage®

 

 

Pyraclostrobin

Insignia®

 

 

Cyprodinil+fludioxonil

Palladium®

Powdery Mildew

Oidium sp.

Potassium bicarbonate

MilStop®

 

 

Streptomyces lydicus

Actinovate®

 

 

Pyraclostrobin + boscalid

Pageant ®

Pristine®

 

 

Azoxystrobin

Heritage®

 

 

Bacillus subtilis QST-713

CEASE®

Serenade®

 

 

Pyraclostrobin

Insignia®

 

 

Trifloxystrobin

Compass®

 

 

Reynoutria sachalinensis

Regalia®

Poinsettia Scab

Spaceloma poinsettiae

Azoxystrobin

Heritage®

 

 

Kresoxim-methyl

Cygnus®

 

 

Trifloxystrobin

Compass®

Alternaria Leaf Spot and Cutting Rot

Alternaria euphorbiicola, A. euphorbiae

Azoxystrobin

Heritage®

 

 

Fludioxonil

Medallion®

Erwinia blight and cutting rot

Erwinia carotovora

Copper Products

Champion

Nu-Cop 3

Camelot O

Phyton

 

 

Bacillus subtilis QST-713

CEASE®

Serenade®

Xanthomonas Leaf Spot

Xanthomonas campestris pv. poinsetticola

Copper products

Champion

Nu-Cop 3

Camelot O

Phyton

 

 

Bacillus subtilis QST-713

CEASE®

Serenade®

Pythium Root Rot

Pythium irregulare, P. ultimum, P. aphanidermatum

Azoxystrobin

Heritage®

 

 

Streptomyces lydicus

Actinovate®

Phytophthora Root, Crown, Leaf, Bract, Flower Blight

Phytophthora nicotianae, P. drechsleri

Pyraclostrobin

Insignia®

 

 

Streptomyces lydicus

Actinovate®

Rhizoctonia Stem Rot

Rhizoctonia solani

Azoxystrobin

Heritage®

Crown and Root Rot

 

Fludioxonil

Medallion®

 

 

Streptomyces lydicus

Actinovate®

 

 

Trichoderma harzianum T-22

Plant Shield®

Root Shield®

T-22

 

 

Trichoderma harzianum T-22, T. virens G-41

RootShield® Plus

 

 

Trichoderma virens

SoilGard

Black Root Rot

Thielaviopsis basicola

Fludioxonil

Medallion®

 

 

Trichoderma harzianum T-22

RootShield®

Too Much or Too Little Water

Homo sapiens

Education

Less eggnog

Too Close to the Fireplace

Homo sapiens

Education

Less eggnog

Happy Growing! We hope the holidays are special and filled with love and appreciation for what you have, what others bring to our lives, and what we can offer to others to enrich their lives. During these busy times, don’t forget to proudly display your poinsettia as a symbol of the holidays and remember that at home the most common problem that will be seen with poinsettias is how beautiful they make your holiday home appear!

 Season’s Greetings to All!!!

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