Group Title: Central Florida Experiment Station mimeo report - Central Florida Research & Education Center ; CFES-67-3
Title: Nematode control for caladiums
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 Material Information
Title: Nematode control for caladiums
Series Title: Central Florida Experiment Station mimeo report - Central Florida Research & Education Center ; CFES-67-3
Physical Description: Book
Language: English
Creator: Rhoades, H. L.
Affiliation: University of Florida -- Central Florida Experiment Station
Publisher: Central Florida Experiment Station, University of Florida
Publication Date: 1967
 Record Information
Bibliographic ID: UF00075844
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 123190035

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HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida




/00


MCEs 7 FE 63

MideReport'CFES 67 5



.FAS.- U .
APR 18 1967


CENTRAL FLORIDA EXPERIMENT STATION
Sanford, Florida


NEMATODE CONTROL FOR CALADIUMS
L. L Rhoades, Assistant Nematologist

RESULTS FOR 1965


Hot Water Treatment: To determine the effect of hot water treatment on the
keeping quality and subsequent yield of caladium tubers, four varieties (Candidum,
Crimson Wave, Triomphe De L'Exposition, and Mrs. Halderman) were treated at 1220F
for the time periods of 30 and 40 minutes on January 20, 1965. On May 11, 1965,
all sound tubers were cut into standard size planting chips and the total weight
of chips from each treatment recorded. On this same date, tubers of each of the
same varieties were treated in water at 1220F for each of the time periods of 30,
40, and 50 minutes. All treatments were planted during May 12 and 13.

Results of this experiment are shown in Tables 1 and 2. Hot water treatment
caused the varieties Crimson Wave and Candidum to lose somewhat more weight during
storage than the untreated check and Exposition was greatly affected in this
manner. Halderman seemed unaffected by the treatment. Subsequent yield was
greatly increased by the hot water treatment for all varieties except Exposition.
There appeared to be little difference between January and May treatment or length
of immersion as far as yield was concerned.


Table 1.- Effect of hot water treatment on keeping quality of caladium tubers.

Weight before Chips (5/11/65)
treatment (1/20/65) Weight Percent of
Variety (pounds) (pounds) original weight

Crimson Wave
Check 12.9 9.3 72.0
30 min 13.1 7.8 59.5
40 min 12.5 8.4 67.2
Candidum
Check 10.7 8.1 75.7
30 min 12.9 8.8 68.2
40 min 11.5 7.8 67.8
Exposition
Check 16.3 12.6 77.3
30 min 15.2 3.1 20.4
40 min 16.3 8.3 50.9
Halderman
Check 9.8 6.3 64.3
30 min 10.1 6.4 63.4
40 min 9.1 6.1 67.0

100 copies


March 27, 1967






-2-


Table 2.- Effect of hot water treatment of caladium seed tubers on subsequent
tuber yield (hundredweight per acre).

Treated 1/20/65 Treated 5/11/65
Variety 30 min 40 min 30 min 40 min 50 min Check

Crimson Wave 36.7 35.0 48.6 39.5 45.4 12.3
Candidum 27.8 23.1 24.8 23.6 23.2 12.7
Exposition 41.8 44.5 50.4 41.7 44.9 48.1
Halderman 22.4 24.5 28.6 20.9 24.1 9.5


In an experiment on Mr. L. L. Holmes farm at Lake Placid, some reduction of
root-knot galling was obtained from hot water treating (Table 3) but it was not
as great as has been obtained in experiments at Sanford and Zellwood, Florida.
This may have been due to the fact that new land was used. A relatively large
increase in tuber yield was obtained for hot water treating of Crimson Wave but
very little for Candidum.

Table 3.- Effect of hot water treatment of caladium seed tubers on subsequent
yield when planted on new land.


Root-knot index Yieldb
Candidum Crimson Wave Candidum Crimson Wave


Treatment


Check
Hot Water (1220 for 30 min.)


1.90
1.03


2.00
1.06


56.3
59.2


77.5
96.5


aBased on a root galling index of 1, no galling, to 5, severe galling.
bHundredweight per acre.



Nematocides: Nematocides were applied in both peat and sand in 1965. Hot
water treated tubers were planted in all plots. Results are shown in Tables 4
and 5. D-D and Vorlex both significantly increased the yield of Candidum on
peat soil but Zinophos and Dasanit (Bay 25141) did not. Soil treatment had
little or no effect on yield in sand where only a low root-knot infestation was
present.


- -~---






-3-


Table 4.- Effect of soil fumigation on yield of caladium tubers in peat soil.

Yield (hundredweight/A)
Treatment Candidum Crimson Wave

Check 5.5 17.8
D-D, 35 gal/A 12.3 20.7
Vorlex, 35 gal/A 14.4 22.8
Zinophos, 10 lb/A 7.0 16.2
Bay 25141, 10 lb/A 7.8 18.3
LSD .05 4.5 N.S.
.01 6.2




Table 5.- Effect of soil fumigation on yield of caladium tubers in sand soil.


Yield (hundredweight/A)
Treatment Candidum Crimson Wave


Check
D-D, 30 gal/A
Vorlex, 30 gal/A
Zinophos, 10 lb/A
Bay 25141, 10 lb/A
LSD


58.7
55.0
56.0
49.0
55.6
N.S.


55.3
49.8
63.9
51.8
70.4
N.S.


----cl----~





-4-


RESULTS FOR 1966

Greenhouse plantings of caladium tubers treated for various lengths of time
in emulsions of 1000 ppm of Zinophos and Dasanit (Bay 25141) indicated that a
high degree of control of root-knot nematodes was obtained from these chemicals.
In 1966, tubers treated in these chemicals were planted in peat soil along with
hot water treated and untreated tubers. The results are shown in Table 6.
Increases in yield for the chemicals were very similar to that for hot water
treatment.


Table 6.- Effect of chemical and
on subsequent yield.


hot water treatment of caladium seed tubers


Treatment


Check
Hot water (122F. 30 min.)
Zinophos, 1000 ppm 1 hr.
3 hr.
6 hr.
24 hr.
Dasanit, 1000 ppm 1 hr.
3 hr.
6 hr.
24 hr.

LSD .05


Yield (hundredweight/A)
Candidum Crimson Wave


15.0
36.6
58.1
43.6
42.8
37.9
32.6
36.5
43.6
36.7
10.5
14.1


7.2
49.4
44.6
37.4
31.5
47.7
34.2
32.1
41.0
31.5
7.3
9.8


In addition to the above experiment, small plantings of hot water treated
and untreated tubers of the varieties Mrs. Halderman and Triomphe De L'Exposition
were made in peat soil in 1966. The hot water treatment greatly increased tuber
yield for these varieties also (Table 7).

Table 7.- Effect of hot water treatment of caladium seed tubers on subsequent
tuber yield.

Yield (hundredweight/A)
Variety Hot Water Untreated

Halderman 39.5 15.3
Exposition 26.8 13.8


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