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Missouri Cotton News
August 24, 2000
This newsletter is published for the Missouri Cotton Industry.
Editor: Bobby Phipps
State Extension Cotton Specialist
AGRONOMISTS PEST MANAGEMENT FARM MANAGEMENT
Cotton: Bobby Phipps Insects: Michael Boyd David Reinbott
Soil: Gene Stevens Weed Science: Andy Kendig
Area Specialists: Diseases: Al Wrather Irrigation
Mike Milam Area Specialist: Ray Nabors Joe Henggeler
David Guethle
Warren Cork AG ENGINEERING
Pat Turman Van Ayers
39th Annual Delta Center Field Day
August 31, 2000
9:00 a.m.-2:00p.m.
Tours begin at 9:00 and the last tour begins at 1:00 at the Lee Farm(7 miles
southeast of Portageville-Junction of T and TT). Covered wagons depart hourly.
In case of rain, The Field Day will be held indoors. Lunch provided.
Cotton Variety Test Field Day
Our field day will begin at the state variety trial south of Sikeston on the
Johnny Hux farm at 8:30 A.M. The farm is on Hwy 61 about two miles south of
Sikeston on the west side of the road. There will be signs on Highway 61
showing the route. After observing the plots at the Hux farm we will proceed
to the Lee farm located two miles south and five miles east of Portageville.
We will observe the state variety trials on silt loam and on clay soils. The
Roundup Ready trials will be observed also. Lunch will be served at noon at
Rone Hall located on the farm.
Plant Diseases
We are seeing a very small amount of bronze wilt and bacterial blight. They
appear to be at levels that are not of economic importance. Fusarium wilt and
nematodes are a problem is some fields. Fields should be checked in September
for nematodes if a problem is suspected. The proper forms for a soil sample can
be obtained from the county extension offices or on the web at
agebb.missouri/nemaext/nema.form. Treat the samples like a carton of milk
since they must be alive in order to test for population levels. Verticillium
wilt is beginning to express itself in some fields.
Defoliation
Defoliation time is near. If you are concerned about high micronaire we will
be offering the micronaire test service again this year for a fee of ten dollars
per sample. By using the Hal Lewis method of timing defoliation, many high mike
bales can be avoided. With the rains that we received this year the fiber
length should be closer to normal and thus micronaire is not as likely to be
high as it was last year. However it may be wise to check the micronaire of
the bottom bolls in order to be sure that the micronaire is satisfactory.
Good defoliation is very important in order to receive good leaf grades.
Therefore a low priced defoliant may ultimately result in a poor defoliation and
be very expensive due to price discounts for trash. The product choice should
be based upon its effectiveness. On cotton that is not too tall and rank, we
have found a single application to be just as effective as a split application
if plenty of water is used (at least fifteen gallons per acre). If it is hot
and dry, lower rates of chemicals may need to be used in order to prevent
sticking the leaves
We conduct several defoliation trials each year. The following tables show the
results of each trial. I visually rated defoliation, leaf stick, regrowth,
percent open bolls and speed of defoliation. By evaluating all of these
factors, we come up with a single number rating for the overall desirability of
the products used. Usually we use only one application unless the protocol
calls for split applications. We use twenty-two psi and fifteen gallons of
water per acre. Stoneville 474 was the variety used in each test.
Effectiveness of defoliants varies with growing conditions each year and from
field to field. Therefore it is best to monitor the growing conditions for
each trial and take note of the specific year. Even the rates that are most
effective will vary with different conditions. In some years a tank mix will
improve the effectiveness since no one product is always best. For example
when Finish is used it usually works very well but in certain years its'
performance can be enhanced with the addition of Harvade. Shown below are
test results and growing conditions for 1998 and 1999. When reviewing the
tables compare the treatments to the control treatment in each specific test
which is the Prep + Def combination. These trials are conducted in different
fields and some fields will defoliate better than others. We have more details
of the trials that are shown and we also have test results from many other years.
If you would like more details please contact the Delta Center.
Defoliated 9-27-99 Performance 10-12-99
1. Untreated 0
2. Finish 1.0 qt 0.75
3. Finish 1.33 qt 1.75
4. Finish 1.5 qt 2
5. Finish 1.0 qt + Harvade 8 oz 2
6. Finish 1.33 qt + Harvade 8 oz 3.5
7. Finish 1.5 qt + Harvade 8 oz 2.75
8. Finish 1.0 3.25
+ Finish 1.0 qt (7 days after first treatment)
9. Finish 1.33 qt 3.5
+ Finish 1.33 qt (7 days after first treatment)
10. Finish 1.5 qt 4.5
+ Finish 1.5 qt (7 days after first treatment)
11. Finish 5.33 + Harvade 8 oz + Agridex 5.5
+Finish 1.0 qt + Harvade 8 oz (7 days after treatment)
12. Prep 2 pt + Def 1.5 pt 6
Defoliated 9-27-00 Performance 10-11-99
1. Untreated 0
2. Folex 12 oz + Prep 1.5 pt + Dropp .05 lb 6.75
3. Harvade 8 oz + Folex 12 oz + Prep 1.5 pt 5.5
4. Dropp .05 lb + Prep 1.5 pt 2.25
5. Prep 1.5 pt + Folex 12 oz 4.25
6. Ginstar 8 oz 5.75
7. Finish 1.0 qt + Dropp .143 lb 3.25
8. Def 6 16 oz + Dropp .2 lb 6
Defoliated 10-4-99 Performance 10-11-99
1. Harvade 8 oz + Def 12 oz 4.5
2. Harvade 8 oz + Dropp .2 lb + Prep 1.5 pt 5.25
3. Harvade 8 oz + Dropp Ultra 3 oz + Prep 1.5 pt 7
4. Harvade 8 oz + CottonQuik 2 qt 6.25
5. Harvade 8 oz + Finish 1 qt 5.75
6. Harvade 8 oz + Prep 2 pt 6
7. Harvade 8 oz + Ginstar 6.4 oz + Prep 1.5 qt 5.75
8. Prep 1.5 pt + Def 12 oz + Harvade 8 oz 5.75
9. Prep 2 pt + Def 1.5 pt 7.5
10. Untreated 0
(All treatments with Harvade include 1 pt COC)
Defoliated 9-20-99 Performance 10-4-99
1. CottonQuik 1.75 qt + Dropp .066 lb (1-10) 6.5
2. CottonQuik 1.75 qt + Dropp .066 lb (1-15) 6.75
3. CottonQuik 1.75 qt + Def 8 oz 6.25
4. CottonQuik 1.75 qt + Def 12 oz 6.5
5. Prep 2 pt + Def 1.5 pt 7
6. Untreated 0
Defoliated 10-13-98 Performance 10-27-98
1. Untreated 0
2. Def 5
3. Ginstar 8 oz 5
4. Dropp .05 lb + Prep 8
5. Def + Prep + Dropp .05 lb 8
6. Harvade + Def + Prep + Agridex 9
7. Harvade 6.5 oz + Finish 1 qt + Agridex 1 pt 8.5
8. CottonQuik 1.75 qt + Dropp .067 lb 8.5
9. CottonQuik 1.75 qt + Def 8 oz 8.8
10. Finish 2 qt 9.3
11. Dropp .125 lb + Starfire 6 oz 5
+Sodium Chlorate 4.5 lb + AG-98
12. Def 16 oz + Dropp .2 lb 5
September 99 Max Temp Rainfall
1 89 0
2 93 0
3 94 0
4 96 0
5 98 0
6 97 0
7 91 0
8 94 0
9 83 0
10 85 0
11 89 0
12 82 0.001
13 91 0.31
14 80 0
15 80 0
16 83 0
17 76 0
18 79 0
19 84 0
20 89 0.07
21 89 0.25
22 68 0
23 73 0
24 82 0
25 87 0
26 86 0
27 86 0
28 89 0
29 92 0.29
30 72 0
October 99 Max Temp Rainfall
1 72 0
2 78 0
3 81 0
4 84 0
5 57 0
6 75 0
7 79 0
8 82 0.16
9 79 3.86
10 72 0.06
11 79 0
12 81 0
13 79 0
14 84 0
15 68 0
16 83 0
17 83 0.01
18 61 0.001
19 60 0.02
20 59 0.001
21 62 0
22 72 0
23 71 0
24 56 0
25 58 0
26 66 0
27 76 0
28 80 0
29 82 0
30 78 0
31 79 0
University Outreach & Extension does not discriminate on the basis of
race, color, national origin, sex, religion, age, disability or status
as a Vietnam-era veteran in employment or programs.
PRECAUTIONARY STATEMENT
In order to protect people and the environment, pesticides
should be used safely. This is everyone’s responsibility,
especially the users of pesticides. Read and follow label
directions carefully before you buy, mix, apply, store, or
dispose of a pesticide. According to the laws regulating
pesticides, they must be used only as directed by the label.
DISCLAIMER STATEMENT
The University of Missouri does not warrant products mentioned
in this publication. The use of a trade name does not
constitute recommendation of one product over other (generic)
proucts of a similar chemistry.
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