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West Plains |
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| Kerry Siders, EA-IPM |
(806)
894-2406 (phone)
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(806) 638-5635(mobile)
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(806) 897-3104 (FAX)
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| E-Mail: k-siders@tamu.edu | http://lubbock.tamu.edu/ipm | ||||
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| Vol. 7, No. 11 |
1212
Houston Street, Suite 2, Levelland, TX 79336
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July
31, 2002
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CROP
& INSECT SITUATION |
Mainly on some later planted fields. Treatment for pepper spot would be with something like Bravo. For rhizoctonia Folicur could be used. If you have questions on peanut diseases and their treatment give me a call. Southern corn rootworm (a.k.a. cucumber beetle) pressure remains almost none existent. I have seen one larvae in the past month. No other problems noted. Peanut yield potential is very good at this time. Grain sorghum ranges from 3 leaf to soft dough stage. Whorl feeding by various worms has been noted, just make sure damage to sorghum heads trying to exert are not severely damaged. Aphids noted have been primarily corn leaf aphids. Beneficial numbers have been excellent. Weeds continue to be a challenge. Call if need assistance. Cotton ranges from just beginning to bloom to hard cut-out with less than 2 nodes above white bloom. Dryland cotton is under severe stress in most all areas now. Shedding of squares and small bolls has been noted in these dryland acres. |
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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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The Texas A&M University
System, U.S. Department of Agriculture, and the Commissioners Courts
of Texas Cooperating
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Dryland has been fairly void of insect problems up till now. We are finding increasing cotton aphid numbers. Irrigated cotton is of course doing much better where water demands have been met. Irrigated cotton has a whole host of insect pests at this time. Cotton bollworms continue to be a problem in many area fields. Many of these worms are of the chronic nature, where they have lingered for 2-3 weeks at 2000-4000 worms per acre. Some fields the worms do not survive past 5-7 days old but successive populations continue to take a toll on the plant. We are beginning to now have some acute populations. This week we have found a few fields which have small worm counts over 8000 per acre. I have not seen problems with any pyrethroids thus far. Understand that many of these fields also contain a mix of beet armyworms, cabbage loopers, and yellow stripped armyworms. There are few fields where these other worms are not adding much to the overall damage. However, I have noted this week more and more damage from the armyworms to fruit vs. foliage. Keep close watch on this. If feeding damage by armyworms is to fruit than include them in your worm counts for threshold. Be careful what you use to control the mixed populations of worms. Pyrethroids are generally ineffective against armyworms. We have not seen flaring of aphids to date behind worm treatments. Aphids are there and are slowly increasing in most fields. Lygus are still low in number but can be found in many fields. Beneficial numbers are mixed. Basically the next 2-4 weeks are critical for the cotton and whether or not the insect pest make their move. |
COTTON
APHID CONTROL STRATEGIES The newer products that are available include Provado, Centric and Intruder. In my opinion Provado should only be used on populations below 75 per leaf and where coverage is not an issue. Centric provides decent control of aphids but may take a little longer to knock the population below threshold. Intruder is a promising product that has been labeled for 2002.
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The rates of this product fall from 0.6 to 2.3 ounces per acre. The 0.6 rate is compatible with Furadan dollar wise but may lack in control in lush cotton. If you are going to use Intruder at the low rate, then I would target my application at 50 per leaf and use a ground rig. The biggest advantage to the newer aphicides are the reduced reentry intervals compared to Furadan. Suggested Insecticides for control of aphids in cotton
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Control of cotton aphids with various insecticides, RR2200, Rex Isom Farm, Idalou, Texas. 2000
 Posted at this web site by: texagnet Internet Services. |
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