Agfax Buzz:
    June 20, 2014
    cotton-fleahopper-dime-texas-am-06202014-featured

    Texas Cotton: Pointers On Fleahopper Decisions

    AgFax.Com - Your Online Ag News Source

    By Apurba Barman, Entomologist, Texas A&M AgriLife Extension

    Generally speaking, cotton seems to be growing slow and behind normal expectations. The good news is that this year we have not experienced significant thrips pressure. Cotton south of Lubbock has experienced negligible pressure.

    Our scouting indicates that thrips numbers in cotton are really low and much below economic threshold, even where cotton was planted next to wheat. However, some areas in the northern High Plains (Hale and Swisher Counties) have experienced moderate levels of thrips and producers have treated. Although insecticidal seed treatments should protect plants from thrips for 2 to 3 weeks, plants become vulnerable to thrips if germination and growth are delayed.

    Once cotton passes beyond the 4- to 5-true-leaf stage, plants can sustain thrips injury without significant economic loss.

    Weeds are also growing profusely following frequent rains. It may be a good opportunity to tank mix an insecticide such as acephate with a herbicide, thus combining weed control and thrips management in a single field operation. It is important to keep the fields weed free as much as possible because some of these weeds (such as Russian thistle and silver leaf nightshade) can attract other insect pests like cotton fleahoppers and Lygus bugs into your cotton fields.

    cotton-fleahopper-dime-texas-am-06202014-facebook

    This often-used photo shows an adult cotton fleahopper next to a dime. That’s how small they are.

    As cotton starts squaring, keep an eye on the square (fruit) retention. Cotton fleahoppers will be of primary concern during the early squaring fruit-set stage. Adult fleahoppers are pale green in color, oval shaped and about 1/8 inch long. Adult fleahoppers are quick to fly short distances once plants are disturbed. Nymphs are also pale green to greenish in color and they move fast within the plant canopy.

    Both adults and nymphs can cause injury by feeding on young terminals and pin-head squares, using their needle-like piercing-sucking mouthparts. Fleahoppers can cause small squares to die off and turn brown, resulting in a “blasted” appearance. If squares have already fallen off, a resulting scar will be evident at those fruiting positions.

    Start sampling for cotton fleahoppers when cotton is at the early squaring and continue until first flowering. Whole-plant visual sampling and/or drop cloth methods are appropriate for the plants at this stage. Sample every 5 to 7 days, but under heavy infestations this sampling interval should be lowered to 3 to 4 days. Besides counting the number of fleahoppers (both adults and nymphs), estimate crop growth stage and percent square set during each sampling effort. Sweep nets can also be used to sample fleahoppers, but it may be harsh on the young tender cotton plants.

    The 3 following pieces of information are required to determine the threshold for cotton fleahoppers and decide when to initiate control measures:

    1. Number of fleahoppers per 100 terminals.
    2. Crop growth stage.
    3. Percent square set.

    For west Texas cotton, use the following economic thresholds:

    • On the FIRST week of squaring, 25-30 fleahoppers/100 terminals and less than 90 percent square set.
    • On the SECOND week of squaring, 25-30 fleahoppers/100 terminals and less than 85 percent of square set.
    • On the THIRD week of squaring to firstbloom, 25-30 fleahoppers/100 terminals and less than 75 percent square set.

    As soon as our crops become more established and recover somewhat from weather or insect-related issues, accelerated plant growth and fruiting development should be possible due to good soil moisture availability following our recent rains.

    Don’t hesitate to reach me at Apurba.Barman@ag.tamu.edu or 806-407-2830 (cell) regarding any cotton insect related questions.

    Source: Focus On South Plains Agriculture, Texas A&M


    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

    Texas: Corn Harvest Begins to Wind Down – USDA9-15

    Oklahoma: Small Grain Planting Underway – USDA9-15

    California: Rice Harvest Begins in Record Heat – USDA9-15

    Alabama: Scattered Showers Provide Minor Benefit to Mature Crops – USDA9-15

    South Carolina: Corn, Tobacco Harvests Wind Down as Rains Improve Crops – USDA9-15

    Georgia: Rains Help Crops, Soybean Harvest Begins – USDA9-15

    Mississippi: Corn Harvest Winding Down, Soybean Harvest in Full Swing – USDA9-15

    Arkansas: Rains Slow Harvest, Corn Yields Look Good – USDA9-15

    North Carolina: Corn Harvest Half Finished as Rains Delay Field Work – USDA9-15

    Florida: Peanut Harvest Begins – USDA9-15

    Doane Cotton Close: Post-Report Strength Wanes9-15

    Kansas: Harvest Underway with Light Frosts – USDA9-15

    Virginia Cotton: Heading for Home Stretch9-15

    New Mexico: Rains Benefit Crops, Pastures, Corn Silage Harvest Underway – USDA9-15

    Arizona: Cotton Harvest Begins, 70% of Bolls Open – USDA9-15

    DTN Cotton Close: Tumbles to Steep Losses9-15

    Missouri: Corn Harvest Stalled by Rain in Some Areas — USDA9-15

    Virginia: Harvest Continues as Weather Allows, Rains Increase Soybean Disease – USDA9-15

    Cotton Outlook: U.S. Production Cut Nearly 1M Bales9-15

    Arkansas Cotton: New Research to Focus on Northeastern Production9-15

    Georgia Cotton: Crop Management Seminar Slated Nov. 12-13 at Tifton9-15

    DTN Cotton Open: Falls to Sharp Losses on Brisk Volume9-15

    Tennessee Cotton: Time to Consult Mid-South Defoliation Guide9-15

    Flint on Crops: Variety Trials are Worth Your Attention9-15

    Keith Good: Cargill Sues Syngenta Over GMO Corn Rejected by China9-15

    Farmland Auction: Arkansas, Louisiana, Mississippi Cropland – October 229-14

    Cotton – Southeast – More Cotton Defoliation; Rains Come Too Late – AgFax9-12

    Cotton – Midsouth – Picking Starts, More Cotton Defoliation Begins – AgFax9-12

    Texas Cotton: High Plains Crop Looks Good; Zero Tolerance Weed Resistance9-12

    Rose on Cotton: USDA Released a Bearish S&D Report9-12

    Tennessee: New Web Tool for Tracking Weather, Heat Units, and Crop Progress9-12

    Doane Cotton Close: Strong Week for Prices9-12

    Cleveland on Cotton: Growers, Do Not Price Your Crop Right Now.9-12

    AFB Cotton Close: Slight Losses in Dec.9-12

    DTN Cotton Close: Mixed for Day, Ahead for Week9-12

    DTN Cotton Open: Lower within Tiny Range9-12

    Georgia Cotton: Prices Unfavorable for State Farmers9-12

    Keith Good: Record Demand for Corn, Soybeans Also in USDA Forecast9-12

    USDA: $328M to Conserve Wetlands and Farmland, Boost Economy9-11

    Doane Cotton Close: USDA Cuts Production Estimates Nearly 1M Bales9-11