Large cutworm larvae collected from infested field in central Arizona


Brown Stink Bug FAQ (PDF, 2.28MB) This publication answers some frequently asked questions about Brown Stink Bugs in Arizona.

Sampling Soil for Root Knot Nematode (PDF, 1.27MB) June 2013
This publication contains steps to help ensure you get a good sample when sampling for Root Knot Nematodes in your soil.

Insect Pests of Desert-Grown Alfalfa: Alfalfa Aphid Complex (PDF, 2.53MB) March 2013
This publication provides diagnostic information to help PCAs and growers distinguish between four damaging aphids found in Arizona alfalfa. Spotted alfalfa aphid and blue alfalfa aphid are most damaging in our system.

Under the Radar, Deep in the Canopy: Brown Stink Bugs in Arizona Cotton (PDF, 1.9MB) August 2012
Brown Stink Bugs (BSB), rarely economic pests of Arizona cotton, are widely reported this year and can be quite damaging. Arizona research confirms that sweep net sampling is ineffective for assessing BSB levels! This IPM Short provides very effective sampling procedures. Management guidelines for AZ are unavailable, but stink bug efficacy information from the Southeastern U.S. is included for consideration.

Soft-Bodied Collops Likes Soft Bodies! (PDF, 461KB) July 2011
Beetles in the genus Collops are valuable predators in cotton. These natural enemies can be preserved in the system by using selective insecticides for whitefly and Lygus control.

Drapetis: A Natural Enemy (PDF, 2.8MB) June 2011
Learn how to identify Drapetis, or “dance flies”. These are important and abundant predators in cotton and other crops

Insect Pests of Desert-Grown Alfalfa: Egyptian Alfalfa Weevil (PDF, 2.2MB) December 2011
A guide to identification, sampling and thresholds for Egyptian alfalfa weevil.

Pale-Striped Flea Beetles in Young Cotton Stands (PDF, 2.2MB) April 2012
A guide to protecting young and emerging cotton from flea beetle damage and the factors to consider in determining control options.

Big-eyed Bugs Have Big Appetite for Pests (PDF, 1.3MB) August 2011
Two species of big-eyed bugs (genus Geocoris) prey on many pest species in cotton and other Arizona crops, providing “free” pest control that can be promoted through the use of selective chemistries

Being Selective! (PDF, 454KB) July 2012
Information on using selective control to protect both the environment and the user.

To Stop or Not to Stop, That is the Question: A Guide to Terminating Lygus Controls (PDF, 1.4MB) July 2012
Thresholds for Lygus bugs in cotton have been well-established for years and validated on commercial acreages in Arizona. This IPM guides provides key factors in decision making about terminating Lygus Controls, concerning production scenarios and individual situations.

$1+ Cotton? New Thresholds? (PDF, 1.9MB) June 2011
While cotton value has increased recently, an economic analysis shows that current recommended thresholds for Lygus and whitefly management in cotton are still the best approach to maximizing profit.

Keeping Cotton Green! (PDF, 608KB) July 2011
This guide describes “selectivity” and the role that selective insecticides can play in conserving natural enemies while still controlling our two key pests of cotton, whiteflies and Lygus bugs.

Untangling the Web…Spiders in Arizona Fields (PDF, 2.3MB) July 2011
Spiders can play an important role in Arizona crop fields, contributing to the biological control of pest insects.

Anatomy of a Cotton Sweep (PDF, 1.0MB) June 2012
A guide to the proper use of a sweep net for sampling key pests in cotton.

In 7 Minutes or Less! (PDF, 2.18MB) July 2012
An illustrated guide to the rapid and efficient sampling of sweetpotato whiteflies (Bemisia tabaci) in cotton.

Assassin Bugs Top the Food Web (PDF, 1.6MB) August 2011
Assassin bugs are “apex” or top predators in the cotton food web contributing to biological control of pests, including Lygus and whiteflies. Two common genera are Zelus and Sinea.

Fuera del Radar, Escondidas en el Follaje Chinches Apestosas Cafés en Algodón de Arizona (PDF, 2.0MB) August 2012
A Spanish language version of “Under the Radar, Deep in the Canopy Brown Stink Bugs in Arizona Cotton”

Collops de Cuerpo Blando (PDF, 115KB) July 2012
A Spanish language translation of “Soft-Bodied Collops Likes Soft Bodies”

Drapetis: Un Enemigo Natural (PDF, 3.0MB) June 2012
A Spanish language translation of “Drapetis: A Natural Enemy”.

Chinche ojona, Tiene un Gran Apetito por las Plagas (PDF, 840KB) June 2012
A Spanish language translation of “jee-AH-kor-is, Big-eyed Bugs Have Big Appetite for Pests”

¡Seamos Selectivos! (PDF, 597KB) July 2012
A Spanish language version of “Being Selective!”

¿Aplicar o No Aplicar?, He Ahí el Dilema Guía para finalizar el control de Lygus (PDF, 1.7MB) July 2012
A Spanish language translation of “To Stop or Not to Stop, That is the Question A Guide to Terminating Lygus Controls”

¡Manteniendo Verde al Algodón! (PDF, 791KB) July 2012
A Spanish language translation of “Keeping Cotton Green!”

Desenredando la Telaraña… ¡Arañas en los Campos de Arizona! (PDF, 2.5MB) June 2012
A Spanish language translation of “Untangling the Web…Spiders in Arizona Fields!”.

Anatomía de las Redadas para Muestreo en Algodón (PDF, 1.2MB) June 2012
A Spanish language guide to the proper use of a sweep net for sampling key pests in cotton

¡En 7 Minutos o Menos! (PDF, 2.4MB) July 2012
Una guía ilustrada a la rápida toma de muestras de camote mosca blanca.

Chinche Asesina en lo Alto de la Cadena Alimenticia! (PDF, 844KB) June 2012
A Spanish language translation of “Assassin Bugs Top the Food Web”


Preplant and Preemergence Dinitroaniline Herbicides in Cotton (PDF, 2.68MB) February 2013
Dinitroaniline (DNA or “yellow”) preemergence residual herbicide at the beginning of the cotton season provides a foundation for season-long weed management. The discovery of glyphosate-resistant Palmer amaranth in central Arizona last year underscores the importance of diversity in weed control tactics. This short outlines effective use practices for DNA herbicides.

Increasing Glyphosate Activity (PDF, 322KB) July 2011
A guide to the many glyphosate products available, and steps you can take to maximize their efficacy.

An Impending Disaster for Arizona Cotton? Glyphosate Resistant Palmer Amaranth (PDF, 2.35MB) July 2012
A probable case of glyphosate (Roundup) resistant Palmer Amaranth (i.e., carelessweed or pigweed) has been discovered in an Arizona cotton field where glyphosate was the only herbicide used. Seed collection and testing is underway to confirm this conclusion. This short highlights important actions growers can take.

Considering Roundup Ready™ Alfalfa (PDF, 1.38MB) October 2011
Now available for planting — should you consider Roundup Ready alfalfa? This guide describes the advantages and disadvantages of planting Roundup Ready alfalfa and also outlines application rates.


Diseases and Production Problems of Cotton in Arizona (PDF, 909KB)

Diseases of Cotton in Arizona -This site, provided by the Extension Plant Pathology section of the University of Arizona, contains text and pictures on cotton disease diagnosis, prevention and management.

Plant Disease Identification -This site, provided by the Extension Plant Pathology section of the University of Arizona, provides information on other crop diseases in Arizona.

Arizona Plant Diagnostics Network

UC Pest Management Guidelines


An Introduction to Pesticides -by George W. Ware and David M. Whitacre

Key crop / pest complexes in the diverse cropping systems of the Southwest and their FQPA-threatened insecticides (“high-risk”), conventional and reduced risk alternatives. -by Palumbo, J.C. and P.C. Ellsworth

Hazard From Herbicide Used in Previous Crop -by Barry Tickes (PDF, 26KB)

Herbicide Symptoms -by Pat Clay, Kai Umeda and Bill McCloskey (PDF, 4.2MB) An overview of herbicides, their classification, mode of action, and target weeds are provided along with photos of symptoms. A presentation.

Herbicide Symptom Key -by Pat Clay and Bill McCloskey

Herbicide Resistance -by Ron Vargas

Pesticide Application Equipment
Air-Assisted Electrostatic Application of Pyrethroid and Endosulfan Mixtures for Sweetpotato Whitefly Control and Spray Deposition in Cauliflower -by John Palumbo and Wayne Coates

Deposition and Efficacy of Capture and Thiodan Applied to Melons Using Several Application Technologies -by John Palumbo and Wayne Coates

Personal Protection Equipment

License Status

Planting Date Management -by Jeffrey C. Silvertooth and Paul W. Brown (PDF, 28KB)

Plant Population Evaluation/Management for Cotton -by Jeffrey C. Silvertooth (PDF, 28KB)

Management Considerations for Short Season Cotton in Arizona (PDF, 42KB)

Making Replant Decisions in Cotton -by R. Boman and R. Lemon, Texas Cooperative Extension Service. Note: these guidelines were developed for Texas production systems. Dates, recommendations and other specific information may not be accurate for cotton production in Arizona or other regions. (PDF, 341 KB)

Agronomic Guidelines for Pima Cotton in Arizona (PDF, 36KB)

Early Season Development
Diseases and Production Problems of Cotton in Arizona -by Mary Olson and Jeffery C. Silvertooth (PDF, 909KB)

Early Cotton Development -by Jeffrey C. Silvertooth (PDF, 26KB)

Early Season Crop Management -by Jeffrey C. Silvertooth (PDF, 31KB)

Managing Growth
Assessing Cotton Yield Loss to Hail Damage in Southern Arizona -by Guangyao (Sam) Wang (PDF, 1.1MB)

Commercially available cotton height-controlling PGRs in Arizona -by Guangyao (Sam) Wang and E. Randall Norton (PDF, 759KB)

Cotton Heat Stress (PDF, 1.2MB)

Crop Management for Optimum Fiber Quality and Yield -by Jeffrey C. Silvertooth (PDF, 21KB)

Determining the Mainstem Node Number for Cotton -by Jeffrey C. Silvertooth and Paul W. Brown (PDF, 30KB)

Estimating Fruit Retention – Procedure -by Jeffrey C. Silvertooth (PDF, 36KB)

Estimating Fruit Retention -by Jeffrey C. Silvertooth (PDF, 36KB)

Estimating the Vegetative Reproductive Balance in Cotton Growth -by Jeffrey C. Silvertooth (PDF, 32KB)

Following Cotton Development Over the Fruiting Cycle -by Jeffrey C. Silvertooth (PDF, 33KB)

Height to Node Ratio – Procedure -by Jeffrey C. Silvertooth (PDF, 33KB)

Management of Fertilizer Nitrogen in Arizona Cotton Production -by Jeffrey C. Silvertooth, Felix Ayala and E. Randall Norton (PDF, 1.1MB)

Mepiquat Chloride (MC) Application Guidelines for Arizona Cotton -by Jeffrey C. Silvertooth (PDF, 47KB)

End of Season
Boll Maturity Dates for Late Season Cotton Flowers -by Paul W. Brown and Jeffery C. Silvertooth (PDF, 320KB)

Choosing Harvest Aid Chemicals for Arizona Cotton -by Guangyao (Sam) Wang, Randy Norton and Shawna Loper (PDF, 515KB)

Crop Management for Defoliation -by Jeffrey C. Silvertooth (PDF, 27KB)

Deciding on the Final Irrigation -by Jeffrey C. Silvertooth (PDF, 35KB)

Defoliation of Pima Cotton (PDF, 40KB)

Defoliation Timing for Arizona Cotton -by E. Randall Norton, Guangyao (Sam) Wang and S. Loper (PDF, 949KB)

Physiology of Cotton Defoliation (PDF, 349KB)

Use of PPO Herbicides as a Cotton Harvest Aid -by Patrick Clay (PDF, 21KB)

Irrigation and Soil
For information about irrigation, click here

General Maturity Groups for Cotton -by Jeffrey C. Silvertooth (PDF, 32KB)

Bt Cotton
Bt Cotton– site from the University of Arizona

BT Cotton In Arizona: ’94 Variety Results (PDF, 42KB)

BT Cotton In Arizona: ’95 Variety Results (PDF, 32KB)

Bt Cotton in Arizona: What will change? (PDF, 31KB)

Cotton Seed Companies

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