T-Y IPM NEWS

news about integrated pest management in Terry and Yoakum counties
Scott A. Russell, EA-IPM
Telephone: (806) 637-4060
Mobile: (806) 893-1041
Fax: (806) 637-2588
E-Mail: sarussel@tamu.edu   http://lubbock.tamu.edu/ipm  
Vol. 2, No. 10
209 South Fifth Street, Brownfield, TX 79316
August 16, 2001

General Situation:
Scattered showers have provided some relief to area producers. This has been limited mostly to the northern portion of Terry County. Cotton fields in the I.P.M. scouting program range from 0 Nodes Above white Flower (NAWF) to 3.0 NAWF, with most shedding those latest squares and smallest bolls due to stress. Insect problems remain limited. Two program fields did reach threshold numbers of bollworms during this past week, one of those was marginal and dropped off naturally. There have been a few scattered aphids and beet armyworms, but nothing to get excited about. Natural enemy numbers are falling off. Cotton fleahoppers and Tarnished plant bugs have been numerous in several fields, but these insects should not be a problem for most cotton.

Whiteflies:
Whiteflies remain abundant in a few area fields, although in general they seem to be fewer in number. Below are tables displaying the results (8 days after treatment) of the whitefly control test conducted in Lubbock County.
Mean number of whitefly adults per fifth mainstem leaf down from top of plant. Bobby Harkins Farm. Lubbock County, 2001.
TRT
rate/acre
Pre
4 dpt
%
Control
Centric 40 WG
3 oz
15.00 a
6.40 a
-27.9
Karate Z + Orthene 90S
2.2 oz + 9 oz
22.80 a
3.47 b
54.4
Thiodan 3EC
53 oz
16.70 a
3.83 b
31.3
UTC
20.23 a
6.75 a
----
LSD (P=.10)
NS
2.523
----
P>F (0.0013)
0.1864
0.0846
----
Means followed by the same letter are not significantly different.

 

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.
The Texas A&M University System, U.S. Department of Agriculture, and the Commissioners Courts of Texas Cooperating
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Mean number of whitefly adults per fifth mainstem leaf down from top of plant. Bobby Harkins Farm. Lubbock County, 2001.
TRT
rate/acre
Pre
4 dpt
%
Control
Centric 40 WG
3 oz
96.63 a
70.72 a
-21.6
Karate Z + Orthene 90S
2.2 oz + 9 oz
51.72 a
53.05 a
-70.4
Thiodan 3EC
53 oz
81.03 a
24.23 b
50.3
UTC
105.4
63.47 a
----
LSD (P=.10)
NS
21.673
----
P>F (0.0013)
0.4257
0.0159
----
Means followed by the same letter are not significantly different.

Bacterial Blight in Cotton:
Dr. Terry Wheeler, Plant Pathologist, Texas Agricultural Experiment Station, Lubbock, has reported some cotton fields with bacterial blight problems are developing around the Muleshoe area. Dr. Wheeler has emphasized that this pathogen is present in numerous fields all around our area, but usually does not have the proper conditions to develop into a major problem. The current weather trend of cooler temperatures and overcast, rainy days may aid the pathogen's development. There are no fungicides labeled for control of bacterial blight on cotton. Tests are being conducted with copper hydroxide fungicides for control of this disease, for a possible future section 18 label. The only sure method of managing bacterial blight is by planting a variety with resistance. The Plains Cotton Improvement Program and cotton seed companies supported a blight nursery (maintained by Texas Agricultural Experiment Station-Lubbock) at the Lubbock Farm Show site in 2000 and 2001.

Many commercial varieties and breeding lines are being evaluated for disease resistance. A list of varieties tested and their rating is provided below.

Susceptible
Partially
Resistant
Resistant
All-Tex
AT101RR
All-Tex
Xpress
All-Tex
Excess
All-Tex Atlas
All-Tex
Xpress RR
FiberMax 819
All-Tex Atlas Plus
Paymaster 2280 BG/RR
FiberMax 832
All-Tex Atlas RR
Stoneville BXN 16
FiberMax 958
All-Tex Excess Plus
Syngenta 2165c
FiberMax 966
All-Tex Max-9
FiberMax 989
All-Tex Top-Pick
Paymaster 1218 BG/RR
DeltaPine 2379
Paymaster 2167 RR
DeltaPine 458 B/RR
Paymaster 280
FiberMax 5013
Stoneville 239
Paymaster 183
Stoneville 239BR
Paymaster 2145 RR
Syngenta NK 2387c
*Paymaster 2200 RR

 

 
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Other Susceptible Varieties tested include:
Paymaster 2266 RR, Paymaster 2326 RR
Paymaster 2326 BG/RR, Paymaster 2344 BG/RR, Paymaster 2379 RR, Paymaster HS-26, Phytogen 355, Phytogen GA161, Phytogen HS-12, Stoneville 2454R, Stoneville 474, Stoneville 4892BR, SureGrow 501BR, SureGrow 521 RR

*Paymaster 2200RR is less susceptible than most varieties in this list, but more susceptible than those on the partial resistant list.


Up Coming Events:
Turnrow Meetings at Gins
Meadow Co-op Gin, Tuesday, August 28, 8:30 A.M.
Needmore Gin, Wednesday, August 29, 8:30 A.M.
Tokio Co-op Gin, Wednesday, August 29, 10:30 A.M.
Terry County Co-op Gin, Thursday, August 30, 8:30 A.M.
Fiber Tex Gin, Thursday, August 30, 10:00 A.M.
Yoakum County Co-op Gin, Monday, September 3, 9:30 A.M.

Topics to include current pests problems and crop termination.
One C.E.U. in the General category will be earned at these meetings.

West Texas Ag Chem Conference, September 19, Lubbock

West Texas Peanut Growers Research Farm Tour, the morning of September 21.


I would also like to express my sincere thanks to Field Scout Pat Barber and Demonstration Technician Tanner Skains for the hard work they put in this season. Both are now returning to school.

 

 

T-Y IPM News is a publication of the Texas Agricultural Extension Service IPM Program in Terry and Yoakum Counties.
Editor: Scott A. Russell
EA-IPM,
Terry & Yoakum Counties		 Production: Bea Pippin


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