Agfax Buzz:
    June 26, 2013
    Cotton at 12 nodes May 2013. West of Wasco, California. Photo by Vern Crawford, PCA, Wilbur-Ellis Co., Shafter, California.

    Texas Cotton: Plant Growth Regulator Considerations

    AgFax.Com - Your Online Ag News Source

    From FOCUS on South Plains Agriculture

    Recent storms have provided much needed moisture across much of the High Plains and parts of the Panhandle. Unfortunately, these storms also brought hail and high winds that have caused varying levels of damage to already delayed cotton crops. Some fields were completely destroyed in the areas where large amounts of hail and/or high winds were observed. Currently, there is no hard number to report in terms of lost cotton crops.




    Reports from Texas A&M AgriLife County Extension Ag Agents and IPM Agents indicate that some fields have already been replanted to cotton or sorghum. Rainfall amounts reported by the Texas Tech University West Texas Mesonet System (Current and Past Precipitation) vary greatly thus far for the month of June and range from a high of 5.13” to a low of 0.93” for Anton and Friona, respectively. These amounts have provided enough moisture to germinate cotton planted to dryland production fields in some areas but more is needed at timely intervals to maintain established stands.

    Based on data from the CottonHeatUnits.com website, heat unit accumulations at Lubbock total 699 DD60s, which is 95 above our long term average of 604. In general, the cotton stands that have been established and managed to dodge the weather bullet appear to be in fair to good condition. Growth stages of these crops range from just emerged or emerging to very early squaring.

    During my travels to the eastern part of the region earlier last week I determined that two dryland variety trial locations we planted had received some moisture following dry planting and were beginning to emerge. With high temperatures forecast in the 90s for the next ten days and only slight chances for additional rainfall, cotton crops that have begun squaring should be watched closely for moisture stress, especially in areas where little rainfall was experienced during the recent storm events.

    Plant Growth Regulators

    Questions concerning mepiquat-based (Pix, Pix Plus, Mepex, Mepichlor, Mepiquat Chloride, Mepex GinOut, Stance, and others) plant growth regulators (PGRs) are being asked. Mepiquat chloride (MC) reduces production of gibberellic acid in plant cells that in turn reduces cell expansion, ultimately resulting in shorter internode length. MC will not help the plants compensate for earlier weather or disease damage by increasing growth rate.

    It may, under good growing conditions, increase fruit retention, control growth and promote earliness. MC should not be applied if crop is under any stresses including moisture; heat; severe spider mite, insect, or nematode damage; disease stress; herbicide injury; or fertility stress.

    Results from our replicated testing indicates that we observed from 5 to 20% reduction in plant height (compared to the control) from 16 oz of 4.2% a.i. MC material applied in up to 4 sequential 4-oz/acre applications starting at match head square (MHS) and ending at early bloom. We have been able to “shave” about 1 node from the growth of the main stem at some locations, which can result in about 3-5 days earlier cutout. Low rate multiple applications beginning at MHS have generally provided more growth control than higher rate applications made at first bloom or later.

    Mepiquat chloride (MC) based products have been around for many years. Several plant growth regulators (PGRs) based on the same active ingredient are now available. Pentia is a formulation of mepiquat pentaborate – a different molecular structure than MC. Mepex Gin Out contains the same amount of MC active ingredient as others, but contains an additional PGR. Refer to the product labels or contact local representatives to ensure you understand the correct use of these products.

    Mepex, Mepichlor, Mepiquat Chloride and other generics 4.2% active ingredient (a.i.)/gallon or 0.35 lb/gallon a.i.

    Pentia
    Mepiquat pentaborate molecule (different from MC) 9.6% a.i./gallon or 0.82 lb/gallon a.i.

    Mepex Gin Out
    4.2% a.i./gallon or 0.35 lb/gallon a.i. with 0.0025% Kinetin (a cytokinin). Cytokinins are plant hormones that promote cell division and growth and delay the senescence of leaves. This product has use guidelines similar to other MC materials.

    Stance
    Stance Bayer CropScience’s Stance product is a mepiquat chloride based PGR. It is a 4 to 1 ratio of mepiquat chloride and cyclanilide (0.736 lbs/gallon mepiquat chloride plus 0.184 lbs/gallon cyclanilide). Cyclanilide is an auxin synthesis and transport inhibitor. Auxins are generally referred to as compounds which have the capacity to induce cell elongation. The inhibition of auxins could reduce cell elongation and inhibit growth.

    Producers should be aware that the mepiquat chloride concentration in Stance is about twice as high as most of the other materials we have become accustomed to applying. THEREFORE THERE IS A CORRESPONDING REDUCED RATE. If you have specific questions concerning this product, visit with your local Bayer CropScience representative.

     


    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

    Virginia Cotton: 1 Spray or 2 for Insects?7-29

    Georgia Cotton: Spots Found on Lower Leaves7-29

    DTN Cotton Open: Trades Lower in Early Going7-29

    Mississippi: Bollworm Counts at High Levels7-29

    Alabama Cotton: Spider Mite Control Proves Tricky7-29

    Keith Good: Bugs’ Resistance to GMO Corn in Brazil Proving Costly7-29

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

    Virginia: Tornado 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