Group Title: Quincy AREC research report - University of Florida Agricultural Research Center ; NF 79-1
Title: Field evaluation of insecticides for control of insects attacking flue-cured tobacco in 1979
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Permanent Link: http://ufdc.ufl.edu/UF00074340/00001
 Material Information
Title: Field evaluation of insecticides for control of insects attacking flue-cured tobacco in 1979
Series Title: Quincy AREC research report
Physical Description: 4, 6 leaves : ; 28 cm.
Language: English
Creator: Tappan, William B., 1928-
Johnson, J. Troy
Agricultural Research and Education Center (Quincy, Fla.)
Publisher: Agricultural Research and Education Center
Place of Publication: Quincy Fla
Publication Date: 1979
 Subjects
Subject: Tobacco -- Diseases and pests -- Control -- Florida   ( lcsh )
Tobacco -- Effect of pesticides on -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: William B. Tappan and J.T. Johnson.
General Note: Caption title.
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Bibliographic ID: UF00074340
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 85809965

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191 AGRICULTURAL RESEARCH AND EDUCATION CENTER
Quincy, Florida

AGRICULTURAL RESEARCH CENTER
Live Oak, Florida

uincy AREC Research Report NF 79-1

Field Evaluation of Insecticides for Control of Insects Attacking
Flue-Cured Tobacco in 1979

William B. Tappan, Entomologist, Quincy, and
J. T. Johnson, Associate Agronomist and Center Director, Live Oak


MATERIALS AND METHODS

One flowable, 1 granular, and 11 insecticidal spray formulations were field
tested on Speight G-28 flue-cured tobacco for insect control, phytotoxicity, and
effects on crop yield and value. Formulations, number of applications, rate of
applications, and dosage of active ingredient per acre per application are pre-
sented in Table 1.

The dates treatment applications were made are gi e;~ a foqtso po.enab es
1 through 6. An interval of 14 days was allowed betwe n1A pl0io'As
spray, Furadan granules were broadcast by hand over t e soil surface and imme lately
incorporated to a depth of 4 to 6 inches in the soil w th a disc ha;rrlt. The
Furadin flowable treatment was applied broadcast with 3-gallon compressed-ai
hand sprayer and incorporated with the soil in the sam l< 0n. itP l A
tractor-mounted C02-pressurized sprayer with 1 hollow- TM zl over er
and 1 hollow-cone nozzle on each side of the row was used to make all other spray
applications. The 3 Tee Jet'D3-25 nozzles per row were designed to deliver
approximately 26 gallons of spray per acre at 60 p.s.i. and 4 m.p.h.

Treatments were replicated 3 times in complete randomized blocks. Each
plot was 2 rows wide and was separated by a 5-foot vacant alley or buffer zone
between ?lots in a block. The rows were 40 feet long and 3.67 feet apart within
plots. Both rows served as the experimental plot for insect counts and phyto-
toxicity ratings, but the left-hand row was harvested for insecticidal residue
analysis and the right-hand row for yield computation. Each row contained 18 to
21 plants set on approximately 22-inch centers. Alleys between blocks of plots
were 20 feet wide. Plots treated with Furadan flowable and granules were 7.33 x
44 feet in size, and were reduced to 7.33 x 40 feet after planting. The test area
was in the southwest corner of the field north of Florida Highway 136.

All cultural practices in preparing the test area for planting were performed
in the usual manner. Beds for planting were prepared and fertilizer applied in
early March. The tobacco was transplanted on March 26, 1979, and hand topped on
June 4. A cooler than normal spring delayed plant maturity and caused the plants
to bloom late. A sucker control, Royal-Tac, was applied on May 31 and IH-30 on
June 8.

Green peach aphid counts were made from natural infestations beginning on
April 18 (pretreatment count), and succeeding counts followed at 14-day intervals.
The time lapse from treatment to first count of the Furadan treatments was
necessarily longer. The remaining counts were made by counting the number of live
alate and apterous aphids on 4 leaves 3 inches or longer down from the bud. Five


* 'A'.







-2-


plants equidistant from each other in each of the experimental rows were counted.
The plants were marked so that each succeeding count was made on the same plants.

Counts of tobacco budworm and tobacco hornworm were made from natural in-
festations on April 18. The count on April 18 was a pretreatment count for all
treatments excluding the Furadan treatments, which were applied pre-plant. All
counts were made on the sane dates as aphid counts, and the time lapse from treat-
ment to count was the same; 14 days. Each plant that had at least 1 larva and
the characteristic feeding injury in each plot was counted as a damaged plant.

Visual phytotoxicity ratings were begun on April 18; pretreatment count was
the same as explained above for worm counts. The pretreatment and succeeding
counts were made on the same dates as for the aphid and worm counts. Plots were
rated according to severity of phytotoxicity observed. The readings were based
on the following system:

0 = None
1 = Slight leaf deformity or chlorosis
2 = Moderate leaf deformity or chlorosis
3 = Heavy leaf deformity or chlorosis with some necrosis
4 = Severe leaf deformity or chlorosis with considerable necrosis

Four leaf primings or harvests were made during the crop season for insecti-
cidal residue analysis on June 5,19, July 10, and 17. A composite sample of
approximately 2 pounds of green leaf was taken from the 3 replications of each of
8 treatments, including the untreated check, and transported to the Pesticide
Research Laboratory on the same day as harvest. The remaining portion of the
composite green leaf sample from each treatment was cured in a bulk barn. The
cured samples were delivered to the laboratory immediately following the curing
process. Treatments analyzed for insecticide residues on green and cured leaf are
identified by footnote "d" in Table 1.

An additional 4 leaf primings for evaluation of crop performance during the
growing season were made on June 6, 18, July 9, and 18. Yield was calculated in
pounds per acre from the total weight of cured leaves from each treatment replication.
The crop value or dollar return per acre was obtained by multiplying the yield in
pounds per acre by the return in cents per pound of cured leaf. The value per
pound was based upon the support price for the various grades of tobacco.

Duncan's multiple range test was applied to all means analyzed to obtain
statistical comparisons for data interpretation.

Rainfall data expressed in inches for the term of the experiment were as follows:

March April May June July
Total- 0.00 5 2.30 1 T 1 0.15 5 0.86
6 0.25 6 0.17 2 0.12 6 0.61
9 0.35 7- T 3- T 7- 0.29
14 0.80 8 1.53 4 T 8 0.24
25 1.34 9 T 12 0.13 10 0.22
26 0.11 10 0.10 15 0.15 11 0.70
27 T 11 T 16 0.94 12 1.14
28 0.04 14 0.43 21 0.13 13 0.16
Total 5.19 24 0.15 22 0.22 14 0.35
25 0.33 23 T 15 0.10
T = Trace 31 0.67 26 T 16 0.56
Grand Total 16.69 Total 3.38 Total 1.84 17 1.05
inches Total 6.28







-3-


RESULTS AND DISCUSSION

Insect activity on flue-cured tobacco during the crop season of 1979 was
the most confounding of the last 24 crop seasons. The green peach aphid occurred
earlier than in 1978, and populations were heavier but within the normal range of
100 to 200 per plant. The increased aphid activity was accompanied by an increased
incidence of potato virus Y (PVY) infected plants. The PVY infestation was con-
sidered moderate, and damage was light. Populations of tobacco budworms and horn-
worms infesting untreated tobacco were the smallest observed since 1955. The
reduction in worn populations may be the first evidence of the effects of crop
residue destruction after the final harvest has been made. Weather conditions
were not drastically different from 1978, which does not fully explain the re-
duction in worm populations. Blue mold, which has not been observed in Florida
since the mid-60's, was a problem in early Hay. Here again, weather conditions
were conducive to the blue mold outbreak, but temperatures were not all that
different from 1578. However, rainfall during April and May average 2.05 inches
greater than in 1978, which may have influenced the blue mold outbreak. As
has been the case in past years, cabbage looper populations were extremely light,
and no control data was obtained.

Green peach aphids were present in small numbers at the pretreatment count
on April 18, and populations on the untreated check increased steadily# until the
count on July 11. (See Table 2.) All treatments with the exception of Bolstar,
Penncap-M, Pydrin, and RH-0994 gave significant control for the entire season. The
failure of Penncap-M to give season long control was probably related to the
reduced dosage being tested. Generally, the synthetic pyrethroids do not control
the green peach aphid, but the data indicated significant control with both formu-
lations of Pounce and population suppression with Pydrin. As in 1978, the
coefficient of variability was high for all counts, and the results were thereby
influenced by the reliance on natural infestations for test purposes. Natural
infestations seldom affect all plants uniformly, which causes the high degree of
variability. On May 30, the coefficient of variability was 347%, and on June 13
was 353%. Even though the data indicated some benefit in suppressing aphid popu-
lations with the synthetic pyrethroids, Pounce and Pydrin could never be recommended
to the grower for control. Yield and dollar return data in Table 6 indicate that
the green peach aphid had little influence on either index.

Budworm populations in the pretreatment count were smaller than in 1978.
(See Table 3.) The population in the untreated check declined on May 2 and
showed slight increases on May 16 and 30, which were unusually low for that time
in the season. After the plants were hand topped on June 4, a drastic decline
occurred. The count on May 30 indicated that all treatments except Furadan 4F,
Penncap-M, Pounce + Penncap-M, Pydrin, and RH-0308 gave significant budworm control.
Again the reduced dosage of Penncap-M resulted in poor control, and probably
contributed also to the poor results with the tank mix of Pounce + Penncap-M.
There was no significant difference between the two formulations of Pounce. The
effect of budworm control on yield and dollar return was not apparent, since RH-0308
had the highest yield and dollar return of any treatment. (See Table 6.)

The hornworm began appearing earlier than in 1978, and reached their peak in
mid-June. The peak population in the untreated check was about 75% below the peak
in 1978. A decline in population occurred on June 27, and continued for the re-
mainder of the season. (See Table 4.) Considering the count on June 13, all
treatments gave significant control. There was no evident effect of hornworm con-
trol on yield or dollar return. (See Talbe 6.)







-4-


Phytotoxicity was noticed only from treatments with Furadan, and the 15G
formulation caused the most severe plant injury. (See Table 5.) Rainfall in
April and May enhanced the uptake of Furadan from the soil, which resulted in a
positive yield response. This was contrary to the past two years, which were
characterized by relatively dry conditions during April and May. The increased
yield and dollar return from the Furadan treatments indicated no adverse effects
from the phytotoxicity observed. (See Table 6.)

Yield of cured tobacco from all treatments including the untreated check
was generally smaller than in 1978. Total rainfall during the season totaled
only 0.09 inch more than in 1978. Therefore, as far as the total season was
concerned, there was no real difference in rainfall conditions, except during April
and May as stated previously. Quality, as reflected in the dollar return index,
was only slightly poorer than in 1978, but was considered generally good for all
treatments. (See Table 6.)

Average maximum and minimum air temperatures during the season were:
March 76 and 44, April 82 and 57, May 85 and 61, June 89 and 67, and
July 92 and 720 F. Temperatures averaged 1 degree lower for the maximum and
1 degree higher for the minimum in 1978, which indicated that seasonal temperatures
in 1979 were similar to those in 1978. The average seasonal temperature for both
years was 730 F. The generally cool temperatures may have accounted for some of
the reduction in worm populations, but that is pure conjecture. This was the
second year in succession that temperatures were considered to be on the cool
side and the season relatively wet. Both factors coupled with the crop residue
destruction program probably had an adverse effect on the worm population.
However, there did not appear to be any serious influence by the weather on the
aphid population in 1979. There were a few commercial growers who reported
problems with aphids late in the season on sucker growth, which may have been
the result of lack of insecticides applied for worm control that normally give
aphid control.

The tank-mix formulations of Pounce + Orthene, Pydrin + Orthene, and Pounce +
Penncap-M performed well in all tests except Pounce + Penncap-M for budworm control.
The low dosage of Penncap-M in that tank-mix formulation definitely contributed to
the poor performance, since Penncap-M alone at the same dosage gave similar
results. In order for a tank mix of Pounce + Penncap-MI to give satisfactory
results, the dosage of Penncap-II will have to be increased. The data indicated
that tank-mix formulations of synthetic pyrethroids and certain organic phosphates
will give control of the three major insect pests of flue-cured tobacco and have
an advantage over the pyrethroids alone in enhancing aphid control by addition
of the phosphates. The data regarding insecticide residues from the tank-mix
treatments is not available at this time.







AREC, Quincy and ARC, Live Oak, Florida


Table 1. Treatments Applied for Insect Control on Flue-Cured Tobacco (Speight G-28) 1979.


LSs. or Gals. Lbs. AI
No. per Acre per per Acre per
Treatmenta Applications Application Application

Furadan, 10G 1 60.0 6.00
Furadan, 4Fb 1 1.5 6.00
Furadan, 15Gc A 1 40.0 6.00
Pounce, 0.075%S (EC)" 6 29.4 0.17
Pounce (OIL), 0.075%S SEC) 6 30.1 0.17
Pounce, 0.025%S (EC) + 6 25.5 0.05
Orthene, 0.24%S (SP)d 6e 25.5 0.50
Orthene, 0.35%S (SP d 6 28.5 0.84
Pydrin, 0.05%S (EC)] 6 30.3 0.13
Pydrin, 0.025%S (EC) +d 6e 30.3 0.06
Orthene, 0.24%S (SP~d 6e 30.3 0.60
Penncap-M, 0.25%S (F) 6 31.1 0.63
Pounce, 0.025%S (EC) +d 6 30.6 0.06
Penncap-M, 0.25%S (F)d 6e 30.6 0.63
Lannate, 0.29%S (L) 6 31.5 0.76
obnitor, C.5%S (I-I) 6 29.1 1.19
Bolstar, 0.5%S (EC) 6 24.8 1.01
Curacron, 0.36%S (EC) 6 27.0 0.86
RH-0994, 0.24%S (EC) 6 30.2 0.65
RP-0308, 0.24%S (EC) 6 28.6 0.57


SEC = Emulsifiable Concentrate, F = Flowable, G = Granules, L = Liquid, S = Spray, SP = Soluble Powder, and
WI = Water Miscible.
Treatments applied on 4/19, 5/2, 5/16, 5/30, 6/13, and 6/27/79. Tobacco transplanted on 3/26/79.
b Furadan applied on 3/12/79.
c Furadan applied on 3/21/79.
d Treatments analyzed for insecticidal residues.
e Treatments were tank mixes.







AREC, Quincy and ARC, Live Oak, Florida


Table 2. Mean Number of Green Peach Aphid per Plot of Flue-Cured Tobacco (Speight G-28) 1979.

Aphid Countsb Mean Rate
Lbs. AI/Acre/
Treatmenta 4/18c 5/2 5/16 5/30 6/13 6/27 7/11 Application

Furadan, 10Gd 4a 4a 3a 5a Ia 56a 83a 6.00
Furadan, 4Fd 3a 7a la 4a la 2a 1a 6.00
Furadan, 15Ge 4a 3a 2a 4a 14a 154a la 6.00
Pounce, 0.075%S (EC) 3a 7a 7a 5a 10a 66a 91a 0.17
Pounce (OIL), 0.075%S (EC) 6a la 10a 15a 99a 387a 239a 0.17
Pounce, 0.025%S (EC) + 0.05
Orthene, 0.24%S (SP) 4a la Oa 7a 5a la 0a 0.50f
Orthene, 0.35%S (SP) 4a la la Ia 4a Oa 0a 0.84
Pydrin, 0.05%S (EC) 5a 4a 27a 242ab 285ab 364a 153a 0.13
Pydrin, 0.025%S (EC) + O.06f
Orthene, 0.24%S (SP) 4a 2a 0a la 0a 0a 0a 0.60f
Penncap-M, 0.25%S (F) 5a 4a Ia 71ab 0a 80a 43a 0.63
Pounce, 0.025%S (EC) + 0.06f
Penncap-M 0.25%S (F) 3a 0a 2a la ia 0a 13a 0.63f
Lannate, 0.29%S (L) 4a 6a 4a 5a ia 8a 3a 0.76
Monitor, 0.5%S (1U) 4a 3a 2a 2a 3a la 0a 1.19
Bolstar, 0.5%S (EC) 3a 8a 2a 48ab 105a 134a 22a 1.01
Curacron, 0.36%S (EC) 4a 2a la 6a la la la 0.86
PRI-0994, 0.240% (EC) 3a 2a a 174ab 52a 131a 94a 0.65
PJ!-0308, 0.24%S (EC) 5a 2a 0a 3a 4a 11a 42a 0.57
Check (Untreated) 5a 23b 82b 379b 701b 1,791b 1,294b

a See Table 1 for more details. Sprays applied on 4/19, 5/2, 5/16, 5/30, 6/13, and 6/27/79.
b Counts made on 10 plants per plot, totaling 30 plants in 3 plots. Means followed by the same letter are not
significantly different at the 5% level.
c Pretreatment counts. Transplanted plots on 3/26/79. Sucker control Royal-Tac applied on 5/31 and MH-30 on
6/8/79. Plants were topped on 6/4/79. Plots were harv.stad on 6/6, 5/18 7/9, and 7/18/79.
d Furadan applied on 3/12/79.
e Furadan applied on 3/21/79.
f Treatments were tank mixes.







AREC, Quincy and ARC, Live Oak, Florida


Table 3. Mean Percent Budworm Damaged Flue-Cured Tobacco Plants per Plot (Speight G-28) 1979.


b iMean Rate
Budworm Countsb Mean Rate
Lbs. AI/Acre/
Treatment 4/18c 5/2 5/16 5/30 6/13 6/27 7/11 Application

Furadan, 10Gd 18a 15cd 21cd 17bcde 2abc 4abc 2bc 6.00
Furadan, 4Fd 23ab 21de 21cd 25ef 5cd 4ab 2bc 6.00
Furadan, 15Ge 19a 20de 15bc 16bcd 0 5bc 3cd 6.00
Pounce, 0.075%S (EC) 30abc 3ab 2a 6abc 2abc 3abc 0a 0.17
Pounce (OIL), 0.075%S (EC) 38bc 2ab 5a 10abcd lab lab 0a 0,17
Pounce, 0.025%S (EC) + ab0.05
Orthene, 0.24%S (SP) 33a 7abc 4a 12acde 4ab 2ab 0a0.50
Orthene, 0.35%S (SP) 43C la la 4ab 3abcd 0a 0a 0.84
Pydrin, 0.05%S (EC) 44c 0a 5a 20def 1ab 3abc lab 0.13
Pydrin, 0.025%S (EC) + 0.06
Orthene, 0.24%S (EC) 39c 0a 0a Oa 2abc 1ab 0.60
Penncap-M, 0.25%S (F) 40bc 18de 19cd 25ef 6de 7c 2bc 0.63
Pounce, 0.025%S (EC) + 0.06f
Penncap-M, 0.25%S (F) 35abc 12bcd abc 18bcdef 2abc 2ab a 0.63f
Lannate, 0.29%S (L) 40 2ab 6ab 13abcde lab 0a 00.76
Monitor, 0.5%S (WM) 45c 2ab 4a 10 2ab 2ab 0a 1.19
Bolstar, 0.5%S (EC) 39bc 2ab 5a 10abd 3abc ab 1.01
Curacron, 0.36%S (EC) 43c la gab 14abcde 2abc 3abc 0a 0.86
RH-0994, 0.24%S (EC) 34abc 11abcd 8ab 14abcde 4bcd 3abc 0a 0.65
RH-0308, 0.24%S (EC) 48c 5abc 7ab 19cdef 5cd 3abc iab 0.57
Check (Untreated) 47c 26e 27d 30f 8e 5bc 4d --

a See Table 1 for more details. Sprays applied on 4/19, 5/2, 5/16, 5/30, 6/13, and 6/27/79.
b Counts made on 38 to 43 plants per plot totaling 115 to 126 plants in 3 plots. Means followed by the same
letter are not significantly different at the 5% level.
c Pretreatment counts. Transplanted plots on 3/26/79. Sucker control Royal-Tac applied on 5/31 and MH-30
on 6/8/79. Plants were topped on 6/4/79. Plots were harvested on 6/6, 6/18, 7/9, and 7/18/79.
c Furadan applied on 3/12/79.
e Furadan applied on 3/21/79.
fTreatments were tank mixes.
Treatments were tank mixes.







AREC, Quincy and ARC, Live Oak, Florida


Table 4. Mean Percent Hornworm Damaged Flue-Cured Tobacco Plants per Plot (Speight G-28) 1979.


Mean Phytotoxicity Indicesb Mean Rate
a Lbs. AI/Acre/
Treatment 4/18c 5/2 5/16 5/30 6/13 6/27 7/11 Application

Furadan, 10Gd 0 0 0a a 2ab 2ab 3c 6.00
Furadan, 4Fd 0 0 Oa la la 2ab 0a 6.00
Furadan, 15Ge 0 0 Oa 0a 3abc 5bc 0a 6.00
Pounce, 0.075%S (EC) 0 0 0a 0a 0a 0a 08 0.17
Pounce (OIL), 0.075%S (EC) 0 0 0a 0a 0a 1 0 0.17
Pounce, 0.025%S (EC) + 0.05f
Orthene, 0.24%S (SP) 0 0 Oa 2a 1a 0a 0 0.50f
Orthene, 0.35%S (SP) 0 0 2ab 0a 6bc 2ab- 1 0.84
Pydrin, 0.05%S (EC) 0 0 0 0a 1a 0a 0a 0.13
Pydrin, 0.025%S (EC) + 0.06f
Orthene, 0.24%S (SP) 0 0 0a 0a la 0a a .60f
Penncap-M, 0.25%S (F) 0 0 10d 5b 8 3ab 1 0.63
Pounce, 0.025%S (EC) + 0.06f
Penncap-M, 0.25%S (F) 0 0 2ab 0a 6bc 3ab a 0.63f
Lannate, 0.29%S (L) 0 0 10d a 3abc 3ab 0a 0.76
Monitor, 0.5%S (1M) 0 0 4ab la 2ab a a 1.19
Bolstar, 0.5%S (EC) 0 0 2ab 0a 2ab 0a 0a 1.01
Curacron, 0.36%S (EC) 0 0 3ab 0a 2ab 2ab 0a 0.86
5ab 0a 2ab a 0a
PJi-0994, 0.24%S (EC) 0 0 5a O 2b ab a 0.65
RH-0308, 0.24%S (EC) 0 0 6bc a 5abc 2ab 0 0.57
Check (Untreated) 0 1 11d 7b 17d 8c 3c

a See Table 1 for more details. Sprays applied on 4/19, 5/2, 5/16, 5/30, 6/13, and 6/27/79.
bCounts made on 38 to 43 plants per plot, totaling 115 to 126 plants in 3 plots. Means followed by the same letter
are not significantly different at the 5% level.
c Pretreatment counts. Transplanted plots on 3/26/79. Sucker control Royal-Tac applied on 5/31 and MH-30 on 6/8/79.
Plants were topped on 6/4/79. Plots were harvested on 6/6/, 6/18, 7/9, and 7/18/79.
dFuradan applied on 3/12/79.
e Furadan applied on 3/21/79.
Treatments were tank mixes.







AREC, Quincy and ARC, Live Oak, Florida


Table 5. Phytotoxic Effects of Certain Insecticide Formulations on Flue-Cured Tobacco (Speight G-28) 1979.


Mean Phytotoxicity Indicesb Mean Rate
Lbs. AI/Acre/
Treatment 4/18 5/2 5/16 5/30 6/13 6/27 7/11 Applications

Furadan, 10Gd 3.0 3.0 3.3 3.7 0.0 0.0 0.0 6.00
Furadan, 4FK 3.0 3.0 3.3 3.7 0.0 0.0 0.0 6.00
Furadan, 15G 3.0 3.0 2.7 5.0 0.0 0.0 0.0 6.00
Pounce, 0.075%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.17
Pounce (OIL), 0.075%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.17
Pounce, 0.025%3 (EC) + 0.05f
Orthene, 0.24%S (SP) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.50f
Orthene, 0.35%S (SP) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.84
Pydrin, 0.05%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.13
Pydrin, 0.025%S (EC) + 0.06f
Orthene, 0.24%S (SP) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.60f
Penncap-M, 0.25%S (F) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.63
Pounce, 0.025%S (EC) + 0.06
Penncap-H, 0.25%S (F) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.63
Lannate, 0.29%S (L) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.76
Monitor, 0.5%S (WM) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.19
Bolstar, 0.5%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.01
Curacron, 0.36%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.86
RH-0994, 0.24%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.65
RH-0308, 0.24%S (EC) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.57
Check (Untreated) 0.0 0.0 0.0 0.0 0.0 0.0 0.0


See Table 1 for more details. Sprays applied on 4/19, 5/2, 5/16, 5/30, 6/13,
Rating System: 0 = None, 1 = Slight leaf deformity or chlorosis, 2 = Moderate
3 = Heavy leaf deformity or chlorosis with some necrosis, and 4 = Severe leaf
considerable necrosis.
c Pretreatment counts. Transplanted plots on 3/26/79. Sucker control Royal-T
6/8/79. Plants were topped on 6/4/79. Plots were harvested on 6/6, 6/18, 7/1
Furadan applied on 3/12/79.
e Furadan applied on 3/21/79.
Treatments were tank mixes.


and 6/27/79.
leaf deformity
deformity cl


or chlorosis,
hlorosis with


ic applied on 5/31 and ME-30 on
9, and 7/18/79.







AREC, Quincy and ARC, Live Oak, Florida


Table 6. Effect of Certain Insecticidal Treatments on Yield and Dollar Return per Acre of Flue-Cured Tobacco
(Speight G-28) 1979/

Mean Rate Yield Dollar
Lbs. AI/Acre/ Lbs./Acre c Return/Acre
Treatment Application Mean 3 Reps. Mean 3 Reps.c

Furadan, 10Gd 6.00 2,055ab 2,231b
Furadan, 4Fd 6.00 1,961ab 2,185b
Furadan, 15Ge 6.00 2,015a 2,441ab
Pounce, 0.075%S (EC) 0.17 2,114ab 2,369ab
Pounce (OIL), 0.075%S (EC) 0.17 2,037ab 2,377ab
Pounce, 0.025%S (EC) + 0.05f
Orthene, 0.24%S (SP) 0.50f 2,078ab 2,390ab
Orthane, 0.35%S (SP) 0.84 2,153ab 2,424a;
Pydrin, 0.05%S (EC) 0.13 2,054ab 2,175ab
Pydrin, 0.025%S (EC) + 0.06f
Orthene, 0.24%S (SP) 0.60f 1,813a 2,110b
Penncap-M, 0.25%S (F) 0.63 1,898ab 2,143
Pounce, 0.025%S (EC) + 0.06
Penncap-M, 0.25%S (F) 0.63f 2,000ab 2,327ab
Lannate, 0.29%S (L) 0.76 2,196a 2,565ab
Monitor, 0.5%S (WM) 1.19 1,895ab 2,086b
Bolstar, 0.5%S (EC) 1.01 1,83ab 2,217b
Curacron, 0.36%S (EC) 0.86 2,056ab 2,227b
RH-0994, 0.24%S (EC) 0.65 2,189ab 2,416a
Ri-0308, 0.24%S (EC) 0.57 2,210a 2,751
Check (Untreated) 1,780b 2,086b


See Table 1 for more details
Transplanted plots on 3/26/79. Sprays applied on 4/19,
on 6/6, 6/18, 7/9, and 7/18/79.
Means followed by the same letter are not significantly
Furadan applied on 3/12/79.
Furadan applied on 3/21/79,
Treatments were tank mixes.


5/2, 5/16, 5/30, 6/13, and 6/27/79.


Plots were harvested


different at the 5% level.




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