Agfax Buzz:
    August 24, 2013
    cotton-bollworm-scott-steward-07272012-feature

    Texas Cotton: Bollworms Still Bear Watching In Hale, Swisher Counties

    AgFax.Com - Your Online Ag News Source

    By Blayne Reed, Texas AgriLife, IPM Extension Agent, Hale and Swisher Counties

    Last week’s rains and cooler temperatures slowed much of our area cotton from reaching that absolute cut-out stage (3.5 NAWF) this week. I feel we had done a pretty good job of managing our later planted cotton this season so that most fields were not ‘late.’

    Now there are several cotton fields with varying levels of late concerns. With a typical fall, we should be able to count on an August 24th bloom making a harvestable boll in Hale and Swisher Counties seven out of ten seasons, but not much after that date.

    This makes managing fields at 4 our 5 NAWF this week difficult to manage, especially as our sub-moisture remains short and our September heat unit accumulation is in question. It remains a tightrope act with irrigation – stressing cotton into timely cut-out, avoiding stress that triggers harvestable fruit shed and all the while preventing ‘junk’ fruit production from ruining an otherwise good field.

    Our program fields so far this week have ranged from well cut-out with no new blooms noted to 5.7 NAWF. All fields avoiding recent hail events have a solid boll load ranging from a late field with 2.7 ‘made’ bolls per plant to a finishing up 10.2 ‘made’ bolls per plant.

    Most were reaching absolute cut-out (3.5 NAWF) this week with 5 to 7 ‘made’ bolls per plant. Boll set has been relatively high and later fields have plenty of squares and potential, but limited time.

    Actual field pest pressure remains light, but we remain on alert for multiple pests. For the first week in nearly a month, we had no new fields reach ET (economic threshold) for Lygus. Although several cotton fields remain at risk for Lygus damage many other fields are developing past economic Lygus concerns via heat unit accumulation and boll development. Lygus populations remain very spotty.

    We noted in our blog earlier this week that a suspected large bollworm moth flight had begun and that most moths appeared to be drawn more to our large amount of late corn and sorghum rather than cotton.

    This trend seems to be continuing as the only bollworm eggs we are finding in cotton are not near any corn fields. Our fresh bollworm egg lay ranged from 0 to 8,250 eggs per acre in cotton this week. This remains light by any standard and predators are expected to take a toll on eggs and small worms.

    The ET for bollworms is roughly 10,000 to 12,000 worms (not eggs) per acre, crop stage depending. It is quite likely that some area non-BGII cotton will need to be treated this week or next for a late population of bollworms, matching the still at risk ‘lateness’ of our crop.


    Tags: , , ,

    Leave a Reply

    Name and Email Address are required fields. Your email will not be published or shared with third parties.

    Agfax Cotton News

    California: Over 75% of Cotton Has Set Bolls – USDA7-28

    Virginia: Torando Damages Crop, Conditions Lower Than Last Year7-28

    Doane Cotton Close: Rebounds from Oversold Conditions7-28

    Arkansas: Rice Heading, Heat Units Need in Some Areas – USDA7-28

    Mississippi: Crops Look Good, Rains Prevent Some Field Work – USDA7-28

    Oklahoma: Crop Conditions Positive Despite Triple-Digit Temps – USDA7-28

    Texas: Cotton Squaring, Forming Bolls, Sugarcane Aphids Will in Sorghum – USDA7-28

    Alabama: Scattered Rainfall, Army Worms In Certain Areas – USDA7-28

    North Carolina: Rains Benefit Crops, Slow Field Work – USDA7-28

    AFB Cotton Close: Moves Higher in Narrow Range7-28

    Crop Progress: Corn, Soybean Conditions Decline, Still at Historical Highs – DTN7-28

    Arizona: Cotton Squaring Complete, Winter Wheat Harvested – USDA7-28

    DTN Cotton Close: Higher on Suspected Weekend Business7-28

    Tennessee: Keeping Up with Insecticide Names, Ingredients7-28

    Florida: Corn Harvest Slowed by Wet Conditions – USDA7-28

    DTN Fertilizer Outlook: Domestic Ammonia Prices Down Slightly7-28

    DTN Cotton Open: Trades Modestly Ahead7-28

    Tennessee Cotton: Crunch Time for Insect Management7-28

    Flint on Crops: Challenges for Farmers Keep Coming, Keep Changing7-28

    Kentucky: Biosolids Becoming Viable Fertilizer Option7-28

    Keith Good: July 1 Cattle, Calf Inventory Comes in at Historic Low7-28

    California Cotton Moving Quickly, Aphids And Whitefly Around – AgFax7-27

    California Cotton: Crop Setting Up Along 2 Very Different Paths7-26

    California Cotton: Heat Effects, PGR Decisions7-26

    Texas Cotton: Lygus Uptick Noted – Hale And Swisher Counties7-26

    USDA Commentary: Weekly Cotton Markets, Weather by Region7-25

    Rose on Cotton: No Pleasure in this Market Made for Bears7-25

    Georgia Cotton: Aphids Down, Plant Bugs Still Around7-25

    Doane Cotton Close: Futures Continue Lower After Midweek Rally7-25

    South Carolina Cotton, Soybeans: Insects on the Rise7-25

    Mississippi Cotton: Transform Efficacy on Aphids Decreases with Cool Temps7-25

    AFB Cotton Close: Sell-Off Continues7-25

    DTN Cotton Close: Settles on New Contract Lows7-25

    Arkansas: New iPhone App Simplifies Farmers’ Finances7-25

    Shurley on Cotton: Prices Try to Stabilize, Still Show Weakness7-25

    DTN Cotton Open: Extends Losses in Early Going7-25

    Keith Good: Declining Commodity Prices Foreshadow Ag Slump? Maybe.7-25

    Georgia: Corn Earworm, Tobacco Budworm Moth Captures Increasing In Brooks County7-25

    Doane Cotton Close: Prices Break Out of Range Lower7-24

    AFB Cotton Close: Breaks Support with Sharp Losses7-24