Poinsettia Solutions PGR Solutions Insect Solutions Disease Solutions Quick Ref. Guide

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OHP PGRs help poinsettia crop early or late

With the summer sunshine abounding, it’s hard to believe that it is almost poinsettia season! We know there are still a few poinsettia growers out there and they may be looking for any edge they can get. Many factors come in to play when growing a poinsettia crop. Light management and proper spacing are critical to crop quality. Water management and the proper fertilization plan are important, too. Choosing the correct Plant Growth Regulator (PGR) is critical as well, if the crop needs to be regulated.

PGRs regulate plant growth by reducing stem elongation.The result is a compact, more aesthetically- pleasing appearance, darker green leaves, and a plant able to withstand shipping pressures. If you choose to use PGRs, that’s where we can help.

OHP is the leading PGR maker in the horticultural industry with our stable of products:

• Paczol®
• B-Nine®
• Cycocel®

Paclobutrazol-based Paczol is a highly active PGR which, when used correctly as a low dose drench early in the poinsettia crop, can be very effective at controlling height without reducing bract size. Paczol is very effective and efficient as a drench product as it is thoroughly absorbed through the roots. Paclobutrazol moves from the roots to the shoot tips, where it inhibits stem elongation.

Research has shown that low dose Paczol drench applications, whether through a traditional drench or chemigation, are very effective in managing plant height. However, poinsettias are extremely sensitive to an early Paczol drench. Therefore, one single drench application is not recommended. Rather, growers should apply low dose applications as needed using 0.1 ppm per application, using the poinsettia growth curve as a guide.

Paczol applied as an early spray to new lateral breaks also works to effectively control growth. CAUTION!! If you elect to go this route, be aware that an overspray of Paczol to the soil surface will increase Paczol uptake and could result in shorter plants. B-Nine or Cycocel are most effective through leaf absorption and are best used as a foliar spray. Both provide excellent growth control with reduced risk of excessive stunting. They can be used separately or more commonly, as a tank mix. Applications are made post pinch when new growth is from 11⁄2 to 3 inches long. Rates vary depending on the amount of control desired (see label). Growers will most likely have to make repeat spray applications to control growth.

B-Nine should be discontinued after the beginning of short days in the North and no later than Oct. 25 in Florida (consult label). Cycocel can be used until Oct. 21 in the North if conditions are warm and sunny, and through Nov. 1 in the South (consult label). With both Cycocel and B-Nine, rates may be adjusted downward during cool weather conditions.

For more information on the OHP family of PGRs, please refer to the Prescription Growth Solutions PGSx™ of our website at or consult your local OHP regional manager.

Prescription Poinsettia Solutions now available

As part of our Prescription Growth Solutions, we have developed a Prescription Poinsettia Solution PGSx™ geared specifically for those growing the Christmas crop. Hard copies are now available as well as accessing the piece on our website within the Prescription Solutions section.

OHP fungicides effective on poinsettia woes

With over 10 fungicide brands, we have several solutions for those pesky disease issues that can pop up with poinsettias. Disease is a very real issue both early and late in the poinsettia crop.We can help. Here is a list of the common diseases of poinsettias and the OHP products labeled for the disease:

• Pythium — Aliette®, FenStop™, SoilGard®,Terrazole®
• Botrytis — Compass®O, OHP Chipco® 26019 N/G, OHP 26 GT®-O, OHP 6672™, Terraguard®
• Powdery mildew — Compass O, OHP 6672, Strike®,Terraguard,Triact®

For complete labels or more information, call your local OHP representative.

Paczol and B-Nine are registered trademarks of Chemtura Corp. Cycocel is a registered trademark of BASF.

Aliette, Compass, 26 GT, and Chipco are registered trademarks of Bayer. FenStop is a trademark of Bayer. SoilGard and Triact are registered trademarks of Certis USA, LLC. Terraguard and Terrazole are registered trademarks of Chemtura Corp. OHP 6672 is a trademark of OHP, Inc. Strike is a registered trademark of OHP, Inc.