Section 18 Emergency Exemption of Transform® WG for the Control of Sugarcane Aphid in Sorghum

******For IMMEDIATE DISTRIBUTION******

Attention SORGHUM producers and PCAs! Through the Arizona Department of Agriculture, the state of Arizona has sought and received a Section 18 Emergency Exemption that permits the use of Transform WG insecticide within Arizona for the control of sugarcane aphid in sorghum. This new pest to Arizona is known to be highly invasive and difficult to control in sorghum with many older chemistries. Because of the imminent economic harm that this pest represents to our sorghum producers and the dairies that they serve, you may now apply for a permit from ADA and use Transform WG immediately to control sugarcane aphid. It is important that you follow and comply with all instructions provided by ADA and on the Section 18 label for Transform WG.

Steps

  1. Obtain the ADA permit form online at: https://agriculture.az.gov/sites/default/files/Transform%20Use%20Application.pdf
  2. Fill out and return the form to ADA licensing by email to: licensing@azda.gov
  3. ADA will provide you a Section 18 label that you must maintain in your possession when using Transform WG under this exemption
  4. Bring your approved permit to your local retailer and purchase Transform WG
  5. Report all applications of Transform WG to sorghum on ADA’s Form 1080 and submit to ADA
  6. Call ADA if you have any questions about the permitting, reporting or Section 18 label for Transform WG: 602-542-3578, anyone there can help you, including Carlos who is lead on this.

Our Thanks & Gratitude

We are grateful for the ADA’s work to facilitate the approval of this important Section 18 Emergency Exemption! On behalf of all stakeholders, we also thank:

  • Director Mark W. Killian for requesting this Section 18 through his letter of request to US-EPA
  • Mike Buben, Independent PCA, for supplying a letter of support and other economic risk information for the submission
  • Ken Narramore, Independent PCA, and the Arizona Crop Protection Association for supplying a letter of support, economic data and other insights for the submission
  • Greg Green, Sorghum Grower and PCA, for his letter of support
  • KC Gingg, Sorghum Grower and Dairyman, for his letter of support
  • Ana M. Kennedy Otto, Government Relations Manager, and the staff of Arizona Farm Bureau for supporting the submission package with a letter of support
  • Brian L. Bret, State Regulatory Manager & Dow AgroSciences for supporting this request and moving materials into distribution swiftly for use by sorghum producers right away
  • Drs. Ayman Mostafa and Peter Ellsworth, as “qualified experts”, and to the staff of University of Arizona’s Arizona Pest Management Center for the Section 18 submission by ADA and for helping to document the need required by this process.

Here are some links with local information about sugarcane aphid in sorghum.

Any products, services or organizations that are mentioned, shown, or indirectly implied do not imply endorsement by the University of Arizona.

Sugarcane Aphid: A New Threat to Sorghum in Arizona

Ayman M. Mostafa and Peter Ellsworth

University of Arizona, College of Agriculture and Life Sciences, Cooperative Extension

Over the last two weeks the UA Cooperative Extension IPM team received reports from pest control advisors of an aphid heavily infesting sorghum in many fields. The UA members of the Arizona Pest Management Center collected and field identified several samples from the Maricopa / Stanfield areas. The identification by Gene Hall UA Insect Diagnostician confirmed this invader as sugarcane aphid, Melanaphis sacchari. This is a new pest report for our state.

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External identification characteristics of sugarcane aphid.

The infestation in many fields was overwhelming with the plants completely covered in stickiness from the honeydew excreted by the aphids.

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Given this heavy infestation, it is likely this aphid has been in the state for longer than just this year, although reports extended only as far west as eastern New Mexico last year. The sugarcane aphid is distributed over the South, Texas and New Mexico; where it is one of the most important insect pests of grain and forage sorghum. Until recently the sugarcane aphid fed only on sugarcane in the US, but in 2013 it was found feeding on sorghum in southeast Texas near the border with Louisiana. This sorghum-feeding sugarcane aphid biotype spread over north Texas, southern Oklahoma, Louisiana, and Mississippi. Sugarcane aphids survived the 2013 winter in south Texas and spread throughout much of Texas and 12 other southern states during the spring and summer of 2014. In 2015, the sugarcane aphid spread through Texas into Oklahoma and Kansas, eventually infesting 17 states. This area encompasses 90 percent of the US sorghum acreage (Click here for 2015 distribution of sugarcane aphid). Giving the severity of this infestation and the rapid distribution of sugarcane aphid in Texas, this could become a serious impediment to sorghum production in Arizona with serious consequences on forage and dairy industries in the state. Giving the challenges facing forage crops, like alfalfa and now sorghum, in the last few years, it is important to bring different interested parties in the forage and dairy industry together for discussion.

Click here for more information from Texas A&M Agrilife Extension and Research about identification biology, damage, sampling and management.

Cutworms in Alflafa

Ayman Mostafa

There have been many cases of cutworm infestations in alfalfa in central Arizona over the last few weeks. Cutworms are frequent pests in the low desert of Arizona. The granulate (Feltia subterranea) and the variegated (Peridroma saucia) cutworms are the two most common species in alfalfa.

Full grown caterpillars are about 1.5 to 2 inches long and vary in color and patterns. Larvae frequently roll into a C-shape when disturbed. Cutworms feed at night and hide during the day in soil cracks and under debris.

 

Cutworm populations may develop in weedy areas and migrate into seedling or mature stands.

Established fields are damaged when cutworms cut off new growth or feed on the alfalfa foliage. Established alfalfa fields can be severely injured when cutworms cut off new shoots at or below ground level following harvest. The pest often goes undetected after cutting and hay removal but the problem becomes apparent when the field is irrigated and there is little or no regrowth.

Seedling alfalfa stands can be severely damaged by cutworms cutting the seedlings off at or just below the soil surface. Cultural control is important in managing cutworms in alfalfa, especially for new stands. Cutworms are most injurious in fields with high plant residue. Tillage helps to limit cutworm populations; seedlings in well-tilled fields, especially when there is an interval between crops are less likely to have cutworm problems. Keep the field and field edges weed-free. Flood irrigation can drown many cutworm larvae. Flood irrigation during the day will attract many birds that prey on the cutworms as the advancing water forces larvae from hiding. When damage is severe in seedling fields, apply an insecticide bait.

Treatment guidelines have not been established in Arizona. Check for cutworms by looking under duff and carefully digging to a depth of 1 inch in loose soil near alfalfa crowns. When cutworm numbers exceed one or two per foot of row or severe damage is apparent, it may be necessary to treat. If treating with baits, apply baits in late evening or at night when cutworms are on plants.

References:

http://ipm.ucanr.edu/PMG/r1300911.html

http://alfalfa.ucdavis.edu/+symposium/proceedings/2005/05-111.pdf

http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=10705

http://alfalfa.ucdavis.edu/+symposium/proceedings/2006/06-113.pdf