Cutting-Edge PGRs

Wednesday afternoon 2:00 pm

Where: River Overlook (upper level) Room C & D

Research at NC State has focused on optimizing plant growth regulator (PGR) performance

and determining the additional benefits of PGRs. Learn about the latest updates on PGR

combinations, increasing foliar spray efficacy by leaf rewetting, adherence of PGRs to plastic

pots, overcoming low doses in irrigation water, and how the use of PGRs actually make you

money by reducing water and fertilizer use. Come hear how to enhance your best

management practices with PGRs.

MI Recertification credits: 1 (COMM CORE, PRIV CORE)

OH Recertification credits: 0.5 (presentations as marked)

Moderator: Heidi Lindberg, Extension Educator, MSU Extension, Nazareth, MI

2:00 pm Cutting-Edge PGRs (OH: 6D, 0.5 hr)

Brian Whipker, Horticultural Science Dept., North Carolina State Univ.

2:50 pm Session Ends

Sponsored by Fine Americas, Inc.

11/20/16

1

Cutting Edge PGRs Brian Whipker, NC State

Cu#ng&Edge&PGRs&&

Brian&Whipker&Floriculture*Extension*and*Research*

Applica9on&of&Fresco&Foliar&Sprays&for&Counterac9ng&Paclobutrazol&Residue&in&

Irriga9on&Water&Brian&Whipker&

Floriculture&Extension&and&Research&

Research Project Sponsored by:

When&low&concentra9ons&of&paclobutrazol&are&in&irriga9on&water,&plant&growth&is&less&(leF&to&right:&0,&5,&10&or&50&parts&per&

billion).&

Paclo (ppb) 0 5 10 50

Begonia ‘Super Olympia Rose’

Top view

Side view

The&applica9on&of&Fresco&foliar&sprays&(ppm)&counteracted&the&low&level&of&paclobutrazol&(ppb)&in&the&irriga9on&water.&

Fresco (ppm) 0 1 3 6

50

10 5 0

Paclo (ppb)

Conclusions&

•  Low&dose&concentra:on&of&paclo&resulted&in&controlled&growth&of&wax&begonias.&– As&the&rate&of&paclo&increased&from&0&to&50&ppb&the&plants&were&smaller&in&height.&

– Plant&diameter&was&not&significant&with&the&interac:on.&

&

Conclusions&•  Foliar&applica:ons&of&Fresco&at&1,&3&or&6&counteracted&the&paclo&effect.&&– With&5&ppb&paclo,&two&applica:ons&of&1&ppm&Fresco&were&sufficient.&

– With&10&to&50&ppb&paclo,&two&applica:ons&of&3&ppm&Fresco&was&op:mal.&

•  A&double&applica:ons&of&6&ppm&Fresco&may&be&excessive.&

11/20/16

2

Cutting Edge PGRs Brian Whipker, NC State

Bedding&Plants&Augeo&Pre)plant&Liner&Soaks&

Brian&Whipker&Floriculture&Extension&and&Research&

Augeo&Liner&Soaks&(ppm)&

Augeo&>400&ppm&resulted&in&smaller&plants&(37&days&aSer&treatment)&

Petunia ‘Pretty Much Picasso’

&&&0&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&400&

&&&800&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1600&

Augeo&Liner&Soaks&(ppm)&

Augeo&>800&ppm&resulted&in&growth&control&(24&days&aSer&treatment)&

‘Ipomoea ‘Sweet Caroline Light Green’

&&&0&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&400&

800&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1600&

Augeo&Liner&Soaks&(ppm)&

Augeo&resulted&in&increased&branching&(38&days&aSer&treatment)&

Coleus ‘Lifelime Color Blaze’

&&&0&&&&&&&&&&&&&&&&&&&&400&&&&&&&&&&&&&&&&&&&&&&800&&&&&&&&&&&&&&&&&&&&1600&

Conclusions&•  The&largest&variable&when&determining&the&suitability&of&

Augeo&preWplant&liner&soaks&is&plant&type.&–  Coleus:&~800&ppm&–  Impa:ens&(seed):&not&recommended&–  Ipomoea:&400&ppm&or&a&li[le&higher,&but&below&800&ppm&–  Lobularia&‘Snow&Princess’:&not&recommended&–  Petunia&(cu^ng):&400&to&800&ppm&to&control&growth&–  Vinca:&800&ppm&increased&branching,&but&delayed&flowering&

•  Addi:onal&trialing&should&concentrate&on&rates&between&400&to&800&ppm&

-End-

Coleus&Florel&Pre)plant&Liner&

Soaks&

Brian&Whipker&Floriculture&Extension&and&Research&

11/20/16

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Cutting Edge PGRs Brian Whipker, NC State

Florel&Liner&Soaks&(ppm)&

Florel&>125&ppm&resulted&in&shorter&plants&(37&days&aSer&treatment)&

Coleus ‘Keystone Kopper’

&&&0&&&&&&&&&&&&&&&&&&&&&&125&&&&&&&&&&&&&&&&&&&&250&&&&&&&&&&&&&&&&&&&&&500&Conclusions&

•  Based&on&this&experiment&with&‘Keystone&Kopper’&coleus,&a&rate&of&125&ppm&applied&as&a&preWplant&liner&soak&controlled&growth&by&23%.&&

•  Branching&appears&to&be&enhanced&with&250&to&500&ppm.&

•  This&provides&a&beginning&rate&for&growers&wishing&to&conduct&their&own&trials&with&other&cul:vars&and&at&other&loca:ons.&

-End-

Dazide&&PreWplant&Liner&Soaks&

Brian&Whipker&and&Ingram&McCall&

Floriculture&Extension&and&Research&

Dazide&Liner&Soaks&

0 5,000 10,000 15,000 20,000

‘Potunia Plus Pinkalious’

Conclusions&•  Daminozide&(Dazide)&has&root&contact&ac:vity.&

– Liner&soaks&offer&direct&contact&of&daminozide&with&the&root&system.&

– Daminozide&adheres&to&and&is&inac:vated&by&substrate&contact,&which&makes&drenches&imprac:cal.&

•  If&labeled,&daminozide&liner&soaks&may&be&an&alterna:ve&for&northern&growers&where&a&moderate&degree&of&control&is&desired.&– For&southern&growers,&Paclo&liner&soaks&are&3X&more&cost&effec:ve.&

Ethephon&•  Florel&(3.9%)&has&been&the&industry&standard&for&a&number&of&years.&

•  Collate&(21.7%)&introduced&by&Fine&Americas.&– Collate&drench&label&is&being&developed.&

•  Other&formula:ons&being&marketed&to&the&ornamental&market.&

11/20/16

4

Cutting Edge PGRs Brian Whipker, NC State

Collate&drenches&(in&ppm),&photographs&taken&(a)&2&weeks&aSer&applica:on&and&(b)&at&bloom.&&&

125 250 500 Collate ppm

0

�Vista Bubblegum�

125 250 500 0

A

B

Collate&drenches&(in&ppm),&photographs&taken&at&bloom.&&&

125 250 500 0

�Americana Dark Red�

Ethephon&•  Applica:on&Rates&

•  Sprays:&250&to&500&ppm&(on&label)&•  Drench:&50&to&250&ppm&&•  Liner&Soaks:&125&to&500&ppm&&

– Species&and&cul:vars&vary&in&response,&thus&you&have&to&conduct&your&own&rate&trials.&

•  Reminders&– Acidify&the&solu:on&to&pH&4&to&5.&– Avoid&applica:ons&to&stressed&plants.&

Exploring&ThreeVWay&Interac9on&of&Dazide&+&Configure&+&Collate&

Foliar&Sprays&Brian&Whipker&

Floriculture&Extension&and&Research&

Effect&of&3Vway&foliar&sprays&on&new&growth&Cali

‘Volcano Pink’

- +Wk3 + Wk5

Wk 3: provided excessive growth control Wk 5: some control

Effect&of&3Vway&foliar&sprays&on&new&growth&Cali

‘Volcano Pink’

Untreated

Wk 3: provided excessive growth control

Wk 5: some control

+ Wk5

+ Wk3

11/20/16

5

Cutting Edge PGRs Brian Whipker, NC State

Conclusions&W&Cali&•  An&early&3Wway&spray&acted&as&a&pinching&agent&for&cali.&– Roo:ng&was&nega:vely&affected.&– Control&extended&un:l&bloom,&with&smaller&plants.&

•  A&transplant&applica:on&provided&growth&control.&

Effect&of&3Vway&foliar&sprays&on&new&growth&

Wk 3: provided growth control Wk 5: provided growth control

- +Wk3 +Wk5

Coleus ‘Grand Via’

Conclusions&W&Coleus&•  An&early&3Wway&spray&acted&as&a&pinching&agent&for&coleus.&– Control&extended&un:l&plants&were&marketable&size,&with&smaller&plants.&

•  A&transplant&applica:on&provided&growth&control,&but&the&rates&used&were&excessive.&

Conclusions&•  Suitability&varies&by&species&and&:ming.&•  Extensive&trialing&required&by&grower&to&determine&the&usefulness&of&this&3WWay&applica:on&to&each&specie&and&cul:var.&

Thanks&expressed&to&Dümmen&Orange&for&supplying&unrooted&cu@ngs&

Study&Recommenda:ons:&&ThreeWWay&Sprays&

OK&/&PROMISING&/&

MAYBE?&

Gomphrena&??&Lantana??&

NG&Impa:ens&Portulaca??&Scaevola??&

NO&

Bacopa&Calibrachoa&

Dahlia&Portulaca&Scaevola&

YES&

Angelonia&Coleus&

Coreopsis&Petunia&

For Applications ~ week 3 of rooting.

Study&Recommenda:ons:&&ThreeWWay&Sprays&

OK&/&PROMISING&/&

MAYBE?&

Coleus?&Coreopsis?&

NG&Impa:ens?&Petunia?&

NO&

Bacopa&Dahlia&

Gomphrena&Lantana&Portulaca&Scaevola&

YES&

Angelonia?&Calibrachoa&

For Applications ~ week 5, two weeks after transplant.

11/20/16

6

Cutting Edge PGRs Brian Whipker, NC State

Enhanced&leaf&green&colora9on&and&zona9on.&

PGR applied

Enhanced&leaf&colora9on&possible&with&some&species.&

No Plant growth regulator applied

20 ppm Piccolo 10XC applied

April 30

Plumbago ‘Imperial Dark Blue’

Substrate Drenches

Enhanced&Petal&Colora:on&&

4 mg Piccolo 10XC applied

1000 ppm Collate applied

2 mg Topflor applied

Untreated Control

PGR Electronic Resources

•  e-GRO Rate App – Contains rate

recommendations based on label rates, university trials, and supplier recommendations.

– Web-based app (database driven)

www.e-gro.mobi/index.php

PGR Electronic Resources

•  e-GRO Rate App – Contains rate

recommendations based on label rates, university trials, and supplier recommendations.

– Web-based app (database driven)

www.e-gro.mobi/index.php

PGR Electronic Resources

•  PGR Mix Master – Brian Krug partnered with

Fine Americas to develop a PGR mixing rate mobile app.

– Available for the iPhone®, Android®, and Blackberry®.

– Calculates mixing rates for sprays and drenches for most of the common PGRs.