Texas Agricultural Extension Service
The Texas A&M University System
 
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. 8
209 South Fifth Street, Brownfield, TX 79316
July 19, 2001

General Situation:
Cotton continues to progress well, where there is sufficient water. Fields range from first bloom to bloom-boll. Square retention rates in irrigated fields ranges from 83% to 97%. We are beginning to see plants shed the newest squares in response to this extreme heat. Insects this week have been minimal. Fleahoppers are still plentiful, lygus are present along with a few boll worms and a scattering of beet armyworms. The boll worm egg laying seems to have let up.


Terry and Yoakum County Peanut Field Day:
July 26, 8:30 A.M. met at the Terry County Livestock Barn. Site visits to area test plots and discussions addressing current peanut research and production will be led by Texas Agricultural Extension Service personnel. 2.5 C.E.U.s will be provided and breakfast will be sponsored by Western Peanut Growers and Tokio Co-op Gin.

Fleahoppers and Plant Bugs:
Most fields in our scouting program have reached the fourth week of bloom with bolls being much more numerous and therefore can tolerate more fleahopper pressure.

Later planted fields may still be susceptible for another week or so. Plant bugs (Lygus spp.) Are still present in many fields and can damage small bolls. We should still be watchful for these pests. For details on scouting and thresholds see the publication "Managing Cotton Insects in the High Plains, Rolling Plains and Trans Pecos Area of Texas 2001", TAEX publication number E-6. This guide is available here at the office or on the internet at: http://insects.tamu.edu/extension/ag_and_field.

Fleahopper Control Product Evaluation:
As I have mentioned we just completed an evaluation of several products for fleahopper control. This test was conducted using a ground rig with 20 gallons of finished product applied per acre. The table below presents the results as the percent control. These are based on the mean of four replications, examining 20 plants per plot. The percent control calculations take into consideration the number of pests present in the treated plot prior to treatment compared to after treatment as well as the number of pests in the untreated check plots. There was considerable variation in the plots, with some new hatching and or migration into plots.

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
1

 

Product &
Rate
Pretreatment,
Mean Number of
fleahoppers
3 DAT
Percent Cotnrol
7DAT
Percent Cotnrol
14 DAT
Percent Control
Untreated Check
3.75
0
0
0
Leaverage 2.7 @ 3.0 oz/acre
4.25
92
60
26
EMC numbered
6.0
77
32
27
Capture 2EC @ 2.6 oz/acre
4.25
76
52
-62
(considerable migration/hatching
compared to control)
Acephate 90SB @ 4.0 oz/acre
6.0
32
55
69
Centric @3.0
oz/acre
4.5
85
100
3
DAT-Days after treatment

Bollworms:
Bollworm populations have remained relatively low. A few fields across the area have required treatments. Often worm damage can be found but no worms. The large numbers of beneficial insects and high heat have assisted in keeping these guys in check. It will be important now to keep track of boll set rates and inspect not only terminals but the entire plant for worm damage and live worms. If bollworms begin to survive any length of time they will reduce fruit retention rates quickly. Also, there have been a few beet armyworms scattered about. Remember that not all products which control bollworms will control beets

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


Posted at this web site by:
texagnet Internet Services.

 
2