Group Title: Field day (Potato Investigations Laboratory)
Title: Field day.
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 Material Information
Title: Field day.
Physical Description: Serial
Publisher: Potato Investigations Laboratory,
Publication Date: 1961
 Record Information
Bibliographic ID: UF00076392
Volume ID: VID00004
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: 145912949 - OCLC

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Li


Speaker
R.B. Workman

A.H. Eddins

R.A. Dennison

E.N. McCubbin

D.R. Hensel


PROGRAM

Subject
Control of Potato and Cabbage Insects

Corky Ringspot of Potato

Potato Utilization

Potato and Cabbage Production

Soil Fertility Problems


A tour of potato test plots on the Yelvington Farm
will be made after the Coffee Break. Follow the
tour leader or get a road plan before yolu leave
and looK for markers at road intersections.


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POTATO INVESTIGATIONS LABORATORY
P.O. Box 728
Hastings, Florida
Telephone 692-1792








FIELD DAY
March 28, 1961


Page
2

3

3

4-5

6


'i i"i.








CONTROL OF POTATO AND CABBAGE INSECTS
R. B. Workman



Control of Cabbage Insects.- Nineteen treatments for the control of cabbage
insects were applied seven times during the season at the Potato Laboratory.
Few insects were present until the last of the season due to cold weather.
Good populations built up in March and comparative data were taken.


Insecticide Dosage/A. Insecticide Dosage/A.
1. Diazinon 250AG 1 pt. 11. Parathion 4F pt.
2. Dilan 5EC 1 qt. plus
3. Dimethoate 4EC I pt. Triton B-1956 2 oz.
4. Dimethoate 4EC 1 pt. 12. Phosphamidon 4EC 3/4 pt.
5. Endrin 1.6EC1 1 pt. 13. Pyrenone 60-6 1 pt.
6. Geigy 30494 2EC 1 qt. 14. SD 4402 1.25EC 1 pts.
7. Guthion 1.25EC 1 1/3 qts. 15. Thiodan 2EC 1 qt.
8. Parathion 4F 2 pt. 16. Thuricide 30B 2 Ibs.
9. Parathion 4F 1 pt. 17. Toxaphene 8EC 1 I pts.
10. Parathion 4F pt. 18. Toxaphene 8EC 1 qt.
plus 19. Vapona 4EC I pt.
Toxaphene 8EC 1 pt.
lTwo applications followed by Treatment No. 8 thereafter.



Control of Potato Insects.- Wireworm tests this year include three granular
and four emulsion type insecticides. Data will be taken at harvest. Tests
last year showed that Parathion, Diazinon, American Cyanamid 18133, Thimet,
and Union Carbide 8305 gave excellent control when disked into the soil before
planting.
Endrin and Thiodan, in two years of testing, gave the best control of the
green peach aphid on potatoes. Parathion in several different formulations
and with different spreader-stickers has given poor control. Disking under of
old cabbage beds will prevent aphid migration from cabbage to potatoes.

Wireworm Biology.- The very large numbers of Conoderus fall clickbeetles
captured in a light trap last fall (2500-7500 weekly) failed to result in high
wireworm populations in the soil at planting time. Wireworms were common
throughout the potato growing area but were in lower numbers than the previous
season. Clickbeetles have been taken regularly in low numbers (100-200 weekly)
this season since February 20.

Safety Precautions with Insecticides.- All persons using and handling insecti-
cides should read and follow closely all directions on the insecticide label.
Legislation of a highly restrictive nature has been proposed due to the
reported number of accidents with insecticides in certain areas of Florida.
Such legislation would add greatly to the time, effort, and expense of
insecticide application.







CORKY RINGSPOT OF POTATO
A. H. Eddins


Resistance of Potato Seedling Crosses and Varieties to Corky Ringspot

In soil infested with the corky ringspot viruses, 23 potato seedling crosses
and varieties of potatoes are planted in replicated plots to determine their
resistance to corky ringspot. Twenty of the crosses and varieties were created
by potato breeding stations operated by the USDA and state experiment stations.
One cross and two varieties were originated by Canadian breeding stations.
Crosses and varieties planted are listed below. Tubers of each one will be
examined for symptoms of corky ringspot at harvest.

1. B 313-21 9. B 4134-26 17. Saco
2. B 606-3 10. B 4312-21 18. Fundy
3. B 605-10 11. La 6937 19. Avon
4. B 721-1 12. F 5350 20. Delus
5. B 962-9 13. Merrimack 21. Redskin
6. B 3602-4 14. Plymouth 22. Red LaSoda
7. B 3725-1 15. Pungo 23. Blanca
8. TL 1859 16. Sebago

Soil Treatments for Control of Corky Ringspot

Tests to determine if soil pH reactions affect the activity of the soil-borne
viruses causing corky ringspot are continued for the second year. The corky
ringspot-susceptible Sebago variety is planted in severely-infested soil originally
adjusted to pH 3.7 to 4.4 in 1959 with sulfur and readjusted to pH 5.2 to 5.6 with
limestone a few months later. Nontreated soil testing pH 5.3 to 6.7 in adjacent
plots is being used as a check on the treatments. Samples of potato tubers grown
in treated and nontreate4 plots will be examined for symptoms of corky ringspot at
harvest to determine if the causal viruses were killed by the low pH reactions
established in the soil for a short time in 1959. Due to unknown factors or
conditions, none to only 4 trace of the disease appeared in potatoes grown in the
plots in 1960. Corky ringspot behaves erratically. It is hoped that corky ring-
spot will reappear in 1961 and that some information will be obtained on the value
of the sulfur-limestone treatment for controlling the disease.

There is a possibility that nematodes may aid in transmitting the disease.
Thirty pounds of DD per acre were applied to plots of severely-infested soil
December 29, 1960. Later the treated plots and adjacent nontreated plots were
planted to corky ringspot-susceptible Sebago. Tubers grown in the treated and
nontreated plots will be examined for symptoms of corky ringspot at harvest.


POTATO UTILIZATION
R. A. Dennison
Florida potatoes are being evaluated for their potential utilization for
additional processed products, particularly frozen french fries, as well as
chipping. Studies are being made of the effect of maturity and storage conditions
on the chemical composition and physical factors which ultimately determine the
quality of the product. Particularly the sugar and amino acid content of the
potatoes are being determined.









POTATO AND CABBAGE PRODUCTION
E. N. McCubbin


Potato Variety Trials.- Twenty-one potato varieties and 24 seedling selections
from the USDA and other breeding stations were planted 1/12/61 in new land in
13-hill plots replicated five times with 2,250 pounds of 6-8-8 fertilizer/acre.
Yields and tuber characteristics will be recorded at harvest time.


F 5326
F 5350
Avon (Ca)
TL 2988
Netted Gem
TL 6894
B 605-10
TL 6937
B 4160-1
Catoosa (M)
B 962-9
Norland
B 2858-5
TL 6896
Red LaSoda


16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.


Dazoc
B 3692-4
Saco
B 2368-4
Bounty
B 3602-4
Jeff's
B 792-94
B 3725-1
Delus
Redburt
Teton
Haig
B 3391-2
Fund (M)


Pungo
TL 5317
Fundy (Ca)
B 2187-2
F 4834
Avon (P)
B 3429-22
B 4170-7
Allehama
Catoosa (D)
TL 6543
Norgleam
Sebago
B 313-21
Red Pontiac


Potato Seed and Fertilizer Rates.- Sebago potatoes were planted 1/12/61 on new
land at four different seeding rates, with each seeding rate receiving 0.9, 1.0,
1.1 and 1.2 pounds of a 6-8-8 fertilizer per pound of seed. Two-ounce cut seed
were planted with six replications of 16 different seed and fertilizer treatments
as noted below. Yields and grades of potatoes will be taken and compared at
harvest.

Lbs. of Spacing of Seed Pounds of Fertilizer per Pound of Seed
Seed in 40-inch Rows 0.9 1.0 1.1 1.2
per Acre in Inches Pounds of Fertilizer per Acre
2,000 9.84 1,800 2,000 2,200 2,400
2,500 7.89 2,250 2,500 2,750 3,000
3,000 6.52 2,700 3,000 3,300* 3,600*
3,500 5.61 3,150* 3,500* 3,850* 4,200*
*Amounts above 3,000 lbs./acre applied 60 days after planting.

Best returns on old land have generally been obtained by seeding 2,500 pounds
of 2-ounce cut seed/acre and 2,500 to 2,750 pounds of 6-8-8 fertilizer/acre.
Under unfavorable growing and marketing conditions best returns on old land have
been obtained with 2,000 pounds of seed/acre and 2,200 pounds of 6-8-8 fertilizer.
On new land in 1960 best returns were obtained from planting 3,000 pounds of seed
per acre with 3,600 pounds of 6-8-8 fertilizer.


1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.









Weed Control in Cabbage and Potatoes with Herbicides.- Cabbage plots transplanted
10/6/60 were given the following treatments 10/20/60.


4 ibs.
2 Ibs.
4 Ibs.
2 Ibs.


5. CDAA ec. 4 lbs.
6. CDAA ec. 2 lbs.
7. None (check)


Potato plots were treated prior to planting 1/11/61 with Eptam and 13 days
after planting but before plant emergence with Premerge (DNBP) or Vegadex (CDEC)
as follows:


Preplant
Eptam ec. 6
Eptam ec. 6
Eptam ec. 3
Eptam ec. 6
Eptam ec. 3
Eptam g. 6
None (check)


lbs.
Ibs.
Ibs.
lbs.
Ibs.
Ibs.


sprayed & inc.
sprayed & inc.
sprayed & inc.
bedded over
bedded over
bedded over


Before come-up
4 Ibs. CDEC ec.
3 Ibs. DNBP ec.
3 Ibs. DNBP ec.
3 lbs. DNBP ec.
3 lbs. DNBP ec.
3 lbs. DNBP ec.


Cabbage Variety Trials.- Twenty-one cabbage varieties and strains listed below
were replicated 10 times in 25-foot single row plots transplanted 11/3/60 and
fertilized with 1,800 pounds of a 6-8-8 fertilizer/acre.


Copenhagen Market
Emerald
Racine Market*
Racine Market*
Badger Market*
Badger Market*
Marion Market*
Marion Market*
Marion Market*
Marion Market*
Greenback*


19.
13.
7.
8.
18.
21,
10.
11.
i.4.
15.


Greenback*
Globe
Round Dutch
Early Glory
Early Glory
Glory of Enkhuizen
Midseason
Resistant Glory*
Badger Ballhead*
Red Acre


*Resistant to cabbage yellows.


Sources of Nitrogen for Cabbage.- Land uniformly fertilized with 1,800 pounds of a
6-8-8 fertilizer/acre was transplanted to Marion Market cabbage 11/5/60. Various
nitrogenous materials were used three times as sidedressings to the cabbage in this
area on 25-foot, 3-row plots replicated 10 times. Each material supplied 24 pounds
of nitrogen/acre per application. Sidedressing materials were nitrate of soda,
nitrate of soda-potash, ammonium nitrate, calcium nitrate, Nu-green, ammonium
sulfate, 10-0-10, 15-0-15, an all soluble 6-8-8 fertilizer and a check, no treat-
ment. Yields of cabbage from the different treatments will be compared.


1. CDEC
2. CDEC
3. CDEC
4. CDEC


1.
2.
4.
16.
3.
12.
5.
6.
17.
20.
9.







SOIL FERTILITY PROBLEMS
D. R. Hensel


POTATOES

Rotation.- The potato rotation experiment is now in the second year. The
comparison of continuous potatoes on both old and new land will be made with
the rotation. Next year, 1962, all the experimental plots will be planted to
potatoes in order to evaluate the effect of oats, rye, lupine, and volunteer
growth on the yield and quality of potatoes.

Phosphorus.- This experiment will show the optimum rate of phosphorus fertili-
zation on both old and virgin land. The treatments used in this study are 0,
50, 100, 200, and 400 pounds P20 per acre. All plots received a basic rate
of 2,500 pounds per acre of 6-0-8.

Magnesium.- The magnesium requirements of potatoes on virgin land are being
studied. The rates of application of MgO in this experiment are 0, 25, 50,
100, and 200 pounds MgO/A. All plots received a basic rate of 2,500 pounds
of 6-8-8 per acre without magnesium.

Minor Elements.- The effects of minor elements on growth and yield of potatoes
which are growing on virgin soil are being studied. The five elements under
test are manganese, molybdenum, zinc, copper, and boron.

Plastic Mulch.- Black polyethylene plastic is being studied as a mulch. The
effect the plastic has on control of weeds, moisture, diseases, and fertilizer
leaching losses will be recorded as well as the effect on the yield and
quality of potatoes. The effect of the plastic on physical properties of the
soil will also be studied.



CABBAGE

Nitrogen, Phosphorus, Potassium, and Magnesium Fertility of Cabbage.- Three
levels of N,, K, and Mg and two rates of 6-8-8 were used in this study.
These fertilizer treatments are being correlated with total yield and size of
head. The treatments are:

1. 1800 lbs./A. of 6-8-8 + 50 lbs. MgO
2. 2200 Ibs./A. of 6-8-8 + 50 Ibs. MgO
3. 1800 lbs./A. of 3-8-8 + 50 lbs. MgO
4. 1800 lbs./A. of 12-8-8 + 50 lbs. MgO
5. 1800 lbs./A. of 6-4-8 + 50 lbs. Mg0
6. 1800 Ibs./A. of 6-12-8 + 50 lbs. MgO
7. 1800 Ibs./A. of 6-8-4 + 50 Ibs. MgO
8. 1800 lbs./A. of 6-8-12 + 50 lbs. MgO
9. 1800 lbs./A. of 6-8-8 + 100 Ibs. MgO
10. 1800 Ibs./A. of 6-8-8 + 200 lbs. MgO


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