8/11/2019 IronChlorosisOfWoodyPlants.tom Dill
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IRON CHLOROSIS OF WOODY PLANTSby Dr. Tom Dill, past Ext !sio!
E"#$ator, C%as Co#!ty
&a!y tr s, s%r#bs a!" ot% r or!am !tal pla!ts i! N bras'a
s#(( r (rom iro!" (i$i !$y. I! t% So#t%) st part o( t% stat t% r is
!o x$ ptio!. I! (a$t, it $a! b
m#$% )ors % r t%a! ot% r ar as.T% %i*% ma* soils i! t%is ar a
$a#s t% iro! to b ti " #p )it% ot% r l m !tsi! t% soil. T%is ma' s
it #!a+ailabl to t% pla!ts. Si!$ t% iro! is !ot a+ailabl tot% pla!t
t% y ar slo) to *ro), %a+ y llo) l a+ s, a!" )% ! s + r t% bra!$% s
"iba$'. T% y llo)i!* o( t% l a+ s is + ry "isti!$t. T% + i!s o( t%
l a( r mai!som )%at *r !, b#t t% ar a i! b t) ! t% + i!s )ill b y
llo).
C%lorosis b $om s pro*r ssi+ ly mor appar !t as o! tra+ ls ) st
a$ross t%stat . T% mai! r aso! is t% pH o( t% soil. As o! tra+ ls )
st i! N bras'a, t% soilb $om s mor al'ali! , t% pH is %i*% r. T%is
ma' s t% iro! ti " #p )it% ot% r
l m !ts a!" #!a+ailabl to pla!ts.Symptoms i!$l#" partial or
$ompl t y llo)i!* o( l a+ s. T% y llo)i!* (irst
b $om s appar !t b t) ! t% + i!s l a+i!* a ! t)or' o( "ar' r +
i!s o! a *r !is%y llo) ba$'*ro#!". &or s + r symptoms i!$l#"
small r l a+ s t%at t#r! paly llo) a!" " + lop a!*#lar bro)! spots
b t) ! t% + i!s. T% l a( mar*i!s may t#r!bro)! a!" )ill + !t#ally
$#rl, "ry #p b $om s !tir ly bro)! a!" (alls o(( pr mat#r ly.T%
tips o( t% bra!$% s $a! "i a!" poor root " + lopm !t o$$#rs.
T% r ar t%r m t%o"s #s " to $orr $t t% probl m. T% bottom li! is
to * tsom iro! a+ailabl to t% pla!t. & t%o"s i!$l#" -
. applyi!* a mixt#r o( "ry ( rro#s s#l(at a!" s#l(#r to t%
soil/0. sprayi!* t% (olia* )it% sol#tio!s o( ( rro#s s#l(at or iro!
$% lat /1. i!tro"#$i!* iro! salts i!to t% mai! tr#!' or st ms o( a
tr by impla!ti!* or i!2 $ti!*.
T% (irst t)o m t%o"s $a! b #s " (or all or!am !tal pla!ts. T%
t%ir" m t%o" isr stri$t " to tr s a!" lar* s%r#bs.
T% slo) st pla!t r spo!s is applyi!* ( rro#s s#l(at a!" s#l(#r
to t% soil.Ho) + r, )% ! appli$atio! is $orr $t a!" (( $ti+ , a
si!*l tr atm !t may last #p tot%r y ars. Sprayi!* t% (olia* )it%
li3#i" iro! may b *r at (or a!!#al pla!ts a!")% ! $%lorosis is s +
r . T%is m t%o" is + ry $ostly.
Tr#!' impla!ts or i!2 $tio! is + ry (( $ti+ )% ! t% $orr $t $%
mi$als ar #s ".I( too m#$% iro! is appli " t% l a+ s $a! b#r!
bla$', b#t t% y )ill soo! (all a!" t% ! )l a+ s )ill b !i$ a!" "ar'
*r !.
S + ral ot% r optio!s ar a+ailabl . T% i!$l#sio! o( s#l(#r i!
yo#r + ry y ar
la)! ( rtili4 r )ill slo)ly % lp to ma' t% soil mor a$i"i$ )%i$%
ma' s mor iro!a+ailabl (or t% pla!ts to #s . T%is ta' s a lo!* r
tim , b#t "o s % lp o+ r t% lo!*r#!. Lo$ally s + ral p opl %a+ #s "
ammo!i#m s#l(at , a! + ry"ay a*ri$#lt#ral( rtili4 r, to % lp. Si!$
it is r a"ily a+ailabl it is a *oo" $%oi$ . Ho) + r, it is %ar"
to%a!"l a!" * t t% ri*%t amo#!t i! t% ri*%t ar a.
