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Minnesota Flower Growers Bulletin - January,

infection but plant size may be reduced by as much as 30-50%.

Many root knot nematodes have been found in association with caladiums in Florida. Symptoms include discolored, decayed, galled or deformed roots and stunted growth. Control has been achieved with hot water treatments and nematocides.

3) p H - Often in the upper midwest we can have difficulties maintaining a lower pH, i.e. 6.0. If pH should rise above 7.0 caladium growth can be reduced and foliage

discoloration

can occur.

essential to

monitor your

Therefore, it is pH on a regular

basis.

In

all

probability

the

water

pH

may

need to be modified with an acid to water pH prior to watering a crop.

lower

the

4)

Magnesium

deficiency -

Magnesium deficiency can occur in caladium when the media pH rises above 7.0 and/or when plants do nof receive magnesium

through the necessary to

fertilization regime. monitor pH regularly and

It is apply

magnesium

to

a crop on

a

regular basis.

Apply

2 oz/lOO gallons magnesium

sulfate

(epsom

program

salts)

in

a

constant

or

8 oz/lOO gallons

liquid

feed

as

a

single

month.

Do

and

calcium

not

mix

nitrate

application

magnesium

once

a

sulfate

together, as precipitate.

they

will

react

to

form

a

Further References

Aimone, T. 1985. Culture Notes: Caladium. GrowerTalks 49(1 ):22,24.

Auman, C.W.

1977. Three years of caladium

research.

North

Carolina Flower

Growers

Bulletin.

21 (2):3-5.

Conover, C.A. and R.T. Poole. 1973. Influence

of shade level and soil temperature on

forcing

of caladium

bicolor. Fla. State

Hort.

SOC. Proc,,

86:369-372.

Conover, C.A. and R.T. Poole. 1975. Influence

of fertilizer removal, and

level, apical. tuber orientation

bud on

forcing of Caladium

bicolor.

HortScience

10:226-227.

5

1991

Volume 40,Number 1

De Hertough, A.

1985. Holland Bulb

Guide.

International Flower-Bulb

Forcer's Centre,

The

Netherlands.

pp.

177-180.

Harbaugh, B.K.,

F.J. Marausky, T.F. Price,

and D.J. Schuster. 1979.Guidelines for

forcing potted caladiums. Florida

Ornam-

sntal

Growers

Association

Newslettet.

2(1).

Harbaugh, B.K. and B.O. Tjia.

1985. 1985.

Commercial forcing of caladiums.

Florida

Cooperative Extension Service. Food and Agricultural Sciences. 621.

Institute of Circular

Harbaugh, Brent.

1986.

Visual nutrient

deficiency symptoms in Caladium x

H o r t . S c i , h o r t u l a n u m ' 3. Amer. B i r d s e y ' . , 1 1 1 (2):248-253.

SOC,

Hartmann, H.T., and D.E. Kester. 1975. Plant

propagation: Prentice-Hall,

principles and practices. Inc., Englewood Cliffs, N.J.,

U.S.A. pp. 494-500.

Marousky,

F.J.

1974.

Influence of curing

and low temperature during storage on

subsequent sprouting of caladium

tubers.

Proc. Fla. State. Hort. Soc.

a7:426-428.

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