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. 3, No. 12
209 South Fifth Street, Brownfield, TX 79316
August 29, 2002

Current Situation:
This week there has been one field in the IPM scouting program which required treatment for cotton bollworms. This was a later planted field which has plenty of squares for small worms to develop on. Aphid populations continue to decline. The lady beetle populations and lace wing populations continue to increase also. Adult lace wings have been more numerous in the fields than bollworm moths. However these adults will not lay eggs (or the larvae will not survive) unless there are aphids to feed on. I have found aphid mummies in many fields where the aphid populations continued later. The rates of this parasitism have been as high as 10%. It is easier to find open bolls on fields with lighter water.

August was hotter than normal, that is to say we received more heat units than the 30 year average for the month of August. Therefore we can see harvest beginning even sooner than expected. I think we should be prepared to utilize harvest aid materials on much of this crop and get it out of the field in a timely manner, even the "better" dryland fields.

Here is a discussion from Dr. Randy Bowman about the earliness of this crop and a table displaying the accumulated heat units.

Dr. Randy Bowman, from FOCUS, August 23:
Countdown after cutout. Some fields are perhaps as much as 2 weeks ahead of normal in terms of development, based on the fruit load adjustment to available moisture. We have developed a table that indicates where we are as of August 21. It is based on actual Lubbock 2002 heat units from August 1 through 21, and from that point forward, it uses the 30-year long-term average for each day. For example, the table shows that for a field that reached cutout (here defined as 5 Nodes Above White Flower) on August 1, a bloom/boll on that date was able to obtain 350 heat units by about August 18. The 450 total was encountered by August 24. For cutout on August 10, we should obtain 350 heat units by August 27, and 450 heat units by September 2. This table also indicates the likelihood of obtaining maturity of late season bolls. I will spend more time next week discussing some of these issues. DD60 heat unit events based on date of cutout (5 NAWF) and actual Lubbock August 1-21, 2002 temperatures with subsequent long-term average values for the remainder of the season.

 

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The Texas A&M University System, U.S. Department of Agriculture, and the Commissioners Courts of Texas Cooperating
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DD60 Heat Unit Accumulation

Date When Crop Achieved Cutout (5 NAWF) Aug. 1 Aug. 5 Aug. 10 Aug. 15 Aug. 20 Aug. 25
+350 HU
(safe from Lygus bugs)		 Aug.. 18 Aug. 21 Aug. 27 Sept. 2 Sept. 11 Sept. 19
+ 450 HU
(safe from bollworm egg lay)		 Aug. 21 Aug. 27 Sept. 2 Sept. 9 Sept. 20 1034
Total HU through Sept. 30 947 857 753 660 538 446
Total HU through Oct. 15 1034 944 840 747 625 533
Total HU through Oct. 31 1079 989 885 792 670 578

Upcoming Events:
Yoakum County Watermelon Roundup
Saturday, August 31, 9A.M. - 6P.M.
Court House Square in Plains

Turnrow Meetings

(Earn 1 C.E.U. in I.P.M.)
We will cover harvest aid materials and applications.

Tuesday, September 10, 2002
8:00 A.M.: Terry Co. Coop Gin, Brownfield, TX. 10:00 A.M.: New-Tex Gin, Plains, TX.

Wednesday, September 11, 2002
8:30 A.M. : Fiber-Tex Gin, Brownfield, TX.
10:00 A.M. : Tokio Coop Gin, Tokio, TX.

Thursday, September 12, 2002 - 8:30A.M. : Meadow Coop Gin, Meadow, TX.

Friday, September 13, 2002 9:00 A.M. : Yoakum County Coop Gin, Plains, TX.

Yoakum County Field Day
September 18, 8A.M.
Yoakum County Extension Office in Plains
Breakfast and drinks will be provided.

2 C.E.U.s for T.D.A.

Western Peanut Growers Research Farm Tour
September 18
More details coming soon

Terry County Farm Tour
September 19
More details coming soon

 

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: JoAnna Garcia


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