Texas Agricultural Extension Service
The Texas A&M University System
Jones Mitchell
Nolan
Scurry
Stephen Biles
Extension Agent - IPM
P.O. Box 558
Sweetwater, TX 79556
Office: (915) 236-9011
Fax: (915) 236-9018
e-mail: biles-sp@tamu.edu
Website: http://nolan-ext.tamu.edu/ipm
Vol. 4, No. 10
THE INTEGRATED PEST MANAGEMENT NEWSLETTER
FOR THE LOWER ROLLING PLAINS
July 26, 2001
Cotton Conditions

Hot and dry continues to be the weather forecast.
About half of the cotton fields are wilting in the afternoon. These fields range from near bloom to cutout.

Blooming cotton ranges from 2 to 7 Nodes Above White Flower. Fields will be safe from worms 350 heat units after cutout. A field has reached cutout if the average number of nodes above the uppermost, first position white bloom is less than 4. It will take 16 to 20 days to accumulate 350 heat units.

Bollworm are being found (0-25 worms per 100 plants). I have noticed that fields that had high populations of small worms ten days ago, now are nearly worm free. This is evidence that the environmental conditions and the high numbers of beneficial insects are keeping the worms in check.

The Beneficial insects continue to be found in exceptionally high numbers (20-314 per 100 plants). That's no typo. We have seen fields with 3 beneficials per plant.

Turn Row Meetings

July 30 Wright Farm - FM 608, 1 mile South of I-20

July 31 Erwin Farm - Behind "Smilers" on I-20, West of Colorado City.

August 1 David Kattes' Farm - FM 1611 - 1.5 miles North of Hwy. 180

August 2 Stamford Co-op Gin

All meetings will begin at 8:30 a.m.
1 hour CEU in IPM will be available at all meetings.

Table 1. Moth Trap Captures for July, 23 2001
(Moths/day).
County
Bollworm
Budworm
Jones
2.25
0
Mitchell
1.75
0.25
Nolan
34.25
2.75
Scurry
3
0

Educational programs conducted by the Texas Agricultural Extension Service serve people of all ages regardless of socioeconomic level, race, color, sex, religion, handicap or national origin. The information given herein is for educational purposes only. References to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Cooperative Extension Service is implied. We will seek to provice reasonable accomodations for all persons with disabilites for all extension programs. We request that you contact Mr. Stephen Biles (915/236-9011) as soon as possible to advise us of the auxiliary aid or service that your require.

___________________________________________________________________________________________________________

The Texas A&M University System, U.S. Department of Agriculture, and the Commissioners Courts of Texas Cooperating

1

 

Table 2. Heat Units Accumulated from
Selected Dates Through July 24, 2001
From
Total Heat
Units
(60 degrees F)
Total Heat Units
(60/95 degrees F)
5/01
1,747
1,645
5/10
1,651
1,549
5/20
1,467
1,375
6/01
1,290.5
1,202.5
6/10
1,111.5
1,030
6/20
874
808
7/01
628.5
567.5
Table 3. Accumulated Heat Units Required for Different Stages of Cotton
Growth Stage
From Emergence
From Previous Stage
1st True Leaf
16
16
Pin-head Square
455
439
Match-head Square
560
105
1/3 Grown Square
770
210
First Bloom
1064
294
First Open Boll
1641
577
95% Mature Bolls
2271
630

 
Table 4. Estimated Time Sequence of Growth and Development Stages in the Cotton Plant.
Planting Date
 --
1st Square 32 Days
--
1st White Bloom 23 Days
--
1st Open Boll 55 Days
--
30% Open 15 Days
--
60% Open 10 Days
--
85% Open 20 Days
--

 

Table 5. Projected Dates of Crop Growth Landmarks for Various Planting Dates Based on Table 4
Planting
Date
1st
Square
1st White
Bloom
1st Open
Boll
30%
Open
60%
Open
85%
Open
5/01
6/02
6/25
8/19
9/03
9/13
10/03
5/10
6/11
7/04
8/28
9/12
9/22
10/12
5/20
6/21
7/14
9/07
9/22
10/02
10/22
6/01
7/03
7/26
9/19
10/04
10/14
11/03
6/10
7/12
8/04
9/28
10/13
10/23
11/12
6/20
7/22
8/14
10/08
10/23
11/02
11/22
* Keep in mind that these dates are estimates, warmer and cooler temperatures will hasten and delay crop maturity, respectively.

 


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