3/20/13&

1&

Brian Whipker

Nutritional Disorders: Part 1 A Diagnostic Process

Plants&Gone&Bad&

What%is%Up%Here?%

•  Problems&can&be:&– Disease&–  Insect&– Nutri<onal&– Physiological&– Or#a#combina+on#

•  Growing&requires&a&systema<c&approach&to&problem&solving&

DIAGNOSTICS:&A&Systema<c&Approach&

Diagnos(c*Process:**A*Systema(c*Approach&

Petunia&Nutrient&Disorders&

Key&Steps&–&Key&Ques<ons&

How&

?&

What?&(PaPern)&

Where?&(Distribu<on)&

When?&(Time)&

3/20/13&

2&

Key&Steps&–&Key&Ques<ons&

How&

What?&(PaPern)&

Where?&(Distribu<on)&

When?&(Time)&

Key&Steps:&What&•  What&do&the&symptoms&look&like?&

Necrosis%Growth% Chlorosis% Spo6ng%

Key&Steps:&What&•  What&do&the&symptoms&look&like?&

– What&is&the&paPern&on&the&leaves?&

Is*the*pa7ern*similar*if*folded?*

Key&Steps:&What&•  What&do&the&symptoms&look&like?&

– What&is&the&paPern&on&the&leaves?&

Is*the*pa7ern*similar*if*folded?*

No*=*

Bio(c*

Yes*=*

Abio(c*

Problem*Loca(on*–**pa7ern*on*the*plant?*

Roots/%Crown%

Stem%

Flowers%

Leaves%

3/20/13&

3&

Problem*Loca(on*–**

****Plant*Nutri(on#

(Mobile)#

%(Par(ally*Mobile)#

(Immobile)#%YOUNG& OLD

BOTH Problem*Loca(on*–*Plant*Nutri(on#

%Young#

%Old#

=Fe*=Mn#

%A%Ca%%%=B#

%=Zn**=Cu#

-H20

%=Mo#%=S#

%=N***=P#

%=Mg# +EC***+B#%+Mn/+Fe#%=K#

Key&Steps:&What&

•  What&do&the&symptoms&look&like?&– What&is&the&paPern?&– What&problems&occur&with&the&plant?&

What#to#look#out#for &&

•  Experience&•  Technical&guides&(Ecke,%Dümmen,%Fides,%Syngenta)%•  Podcasts&@&Greenhouse&Grower&•  Web&searches&•  Reference&books&

Key&Steps&–&Key&Ques<ons&

How&

What?&(PaPern)&

Where?&(Distribu<on)&

When?&(Time)&

Key&Steps:&Where&

•  Where&are&the&symptoms?&– Distribu<on&within&the&greenhouse&/&bed?&

Living%Factors%(Pathogens*or**

Insects)*

NonAUniform%

DistribuNon&

3/20/13&

4&

ScaOered%Plants%

Uniform%

NonALiving%Factors%(Mechanical,*

Physical,*or*Chemical)%

DistribuNon&

DistribuNon:%All%Plants%

Key&Steps&–&Key&Ques<ons&

How&

What?&(PaPern)&

Where?&(Distribu<on)&

When?&(Time)&

Key&Steps:&When&

•  When&did&the&symptoms&appear?&– Quickly?&&&&&&&(Within&1&to&4&days)&

– Gradually?&&&&(Over&1&to&4&weeks)&&

Key&Steps:&When&

•  When&did&the&symptoms&appear?&– Quickly?&&&&&&&(Within&1&to&4&days)&

– Gradually?&&&&(Over&1&to&4&weeks)&&

Spray%Phyto% Water%Stress%

3/20/13&

5&

Key&Steps:&When&

•  When&did&the&symptoms&appear?&– Quickly?&&&&&&&(Within&1&to&4&days)&

– Gradually?&&&&(Over&1&to&4&weeks)&&

Ini(al:*Slight*interveinal*

chlorosis*of*recently*

matured*leaf*

High%pH%(Iron%Deficiency)&

Ini(al:*Slight*interveinal*

chlorosis*of*recently*

matured*leaf*

Moderate:*Interveinal*chlorosis*

more*pronounced,*

spread*to*other*

leaves*

High%pH%(Iron%Deficiency)&

Ini(al:*Slight*interveinal*

chlorosis*of*recently*

matured*leaf*

Moderate:*Interveinal*chlorosis*

more*pronounced,*

spread*to*other*

leaves*

Advanced:*Bleached*(white)*

interveinal**chlorosis**

High%pH%(Iron%Deficiency)&

Key&Steps:&When&Fast%

• Chemical&phytotoxicity&

• Herbicide&dri[&• Air&pollu<on&•  Environmental&stress&

•  Temperature&extremes&

• Nutri<onal&toxicity&

Moderate%

•  Environmental&–Ca&• Botry+s#

Gradual%

• Diseases&•  Insects&• Nutri<onal&

Key&Steps&–&Key&Ques<ons&

How&

What?&(PaPern)&

Where?&(Distribu<on)&

When?&(Time)&

3/20/13&

6&

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