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Texas
Agricultural Extension Service The Texas A&M University System |
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P.O.
Box 237, Garden City, Texas 79739
Home Phone: 915-354-2466 Fax: 915-354-2348 |
Office
Phone: 915-354-2477
Daily Insect Update: 915-354-2476 E-Mail: w-multer@tamu.edu |
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Website:
http://entowww.tamu.edu
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| VOL. 21, NO. 7 |
Warren
L. Multer, EA/IPM
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June
21, 2001
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PEST MANAGEMENT REPORT NEWS ABOUT
INTEGRATED PEST MANAGEMENT IN GLASSCOCK, REAGAN AND UPTON COUNTIES |
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GENERAL
SITUATION Hot and Dry! Cotton ranges from 1st true leaf to 1/3 grown squares. One field of older cotton had a bloom or two show up this week. Fleahopper numbers are increasing and square sets are getting lower in some fields. SCOUTING PROGRAM Scouts have located all fields and are getting on a set schedule. They should be reporting thrips on pre squaring cotton and fleahopper and % square sets on squaring cotton.
Boll Weevil activity is near 0. The regular weevil traps did not catch any weevils this week but the traps on a field east of Garden City had 1 weevil out of 26 traps. COTTON APHIDS Cotton
Aphids are very light in general. One field has had higher aphid numbers
in spots for 2-3 weeks but predator numbers have increased dramatically
and aphids are dropping. It has caused stunting in parts of the field.
We have tried to avoid treatment because we don't want to get in an
aphid battle at this time of the season.
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COTTON FLEAHOPPERS Fleahoppers ranged from 0-30 per 100 terminals and square sets ranged from 76%-100%. Fleahopper numbers are picking up and square sets dropping in some fields. You should be scouting all squaring cotton for fleahoppers and checking for square loss. Treatment decisions should be made promptly if needed to avoid unnecessary fruit loss and lowering beneficial insect numbers during bollworm activity. Adult fleahoppers are about 1/8 inch long and pale green. Nymphs resemble adults but lack wings and are light green. They move very rapidly when disturbed. Adults move into cotton from weed hosts when cotton begins to square. Both adults and nymphs suck sap from the tender portion of the plant; including small squares. Pinhead size and smaller squares are most susceptible to damage. Management and decision making. The decision to apply insecticide should be based on the number of fleahoppers present, the squaring rate and the percent square set. If conditions are conducive to the rapid build up of cotton fleahoppers in alternate hosts, scouting intervals should be shortened(i.e, monitor fields every 3 to 4 days). During the first week of squaring, the economic threshold is 25 to 30 cotton fleahoppers per 100 terminals combined with less than 90 percent square set. In the second week of squaring, the economic threshold is 25 to 30 cotton fleahoppers per 100 terminals combined with less than 85 percent square set. Starting with the third week of squaring up to first bloom, the economic threshold is 25 to 30 cotton fleahoppers per 100 terminals combined with less than 75 percent square set. |
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BOLLWORM Bollworm eggs have become more numerous this week but are still scattered in lower numbers.
HEAT
UNITS averaged 22 per day the past week. Heat units since 5-1, 5-15
and 6-1 are compared with last year and a five year average in the table
below.
WEATHER
DATA is not available at this time. The weather station is under
repair. |
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*********************************************************************************************************************************************************** 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. ___________________________________________________________________________________________________________
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