Maryland Weed Reporter
http://www.agnr.umd.edu/users/weed/weedrep3.htm
Winter 1997; Volume 13, No. 1

The summer and fall, 1996 editions of the Maryland Weed Reporter discussed many of the changes taking place in the agrichemical industry. This edition will bring you up to date regarding registrations and my thoughts on how we can best utilize these new technologies.

CORN

The following is a list of the new product names we'll be be adding to our arsenal of materials available for weed control in corn. Following that is a short description of my thoughts as to where these products may (or may not) fit.

Action is a Novartis product (old CIBA) for postemergence use in corn and soybeans. It's strength is in velvetleaf control. Otherwise, we've found it weak on most other broadleaf weeds. It's similar to Resource.

Aim is being developed by FMC for postemergenc broadleaf weed control in corn. They're also looking at it for use in small grains under the trade name Affinity. It's chemistry is similar to Authority, but this product has little to no residual activity. From what we've seen, it does a nice job on many summer annual broadleaf weeds, but you may need to add atrazine to it.

Axiom by Bayer is a package-mix of a grass herbicide (coded FOE-5043) plus Sencor. We've had it in our trials for 2 years. In 1995, a dry year, it performed poorly on annual grass control. In 1996, a wet year, it looked excellent on control of annual grasses (foxtails, fall panicum, crabgrass). While it has Sencor in it, Sencor is a triazine herbicide. Thus, control of triazine-resistant pigweed or common lambsquarters will not occur with this product.

Balance by Rhone-Poulenc is a preemergence product that has activity on a number of annual grasses and broadleaf weeds. Yet, at the rates they want us to use, it will not be a stand alone product. It will require the addition of atrazine or possibly a half rate of a grass/atrazine product like Bicep. Under cold, wet conditions, it will bleach corn.

Basis Gold is a package-mix of Matrix + Accent + atrazine by DuPont. It does a nice job on most grasses and broadleaf weeds when applied postemergence with the exception of triazine-resistant pigweed and common lambsquarters. You'll need to add some Banvel to pick up the escapes. While I'm on the subject of Basis Gold, Basis (a mixture of Matrix + Pinnacle) was available in 1996. From what we've seen, it does a nice job when applied early postemergence on a number of weeds, particularly triazine-resistant pigweed and common lambsquarters. In 1997, DuPont is promoting this product preemergence. I have never applied this product preemergence. I'm uncertain whether the residual aspects of this product will provide season-long control.

Broadstrike by DowElanco will be available by itself in 1997. This will allow you the opportunity to mix it with whatever product you choose. Does a nice job on triazine-resistant pigweed and common lambsquarters, preemergence. Since you can have injury with this product under cold, wet conditions, I would recommend using it with an IR corn line.

Dual Magnum, the more active isomer formulation of Dual by Novartis, will be test marketed in the mid-west this year. Expect to see all Dual and Bicep products to switch to Dual Magnum in the future. Is the patent coming off Dual? Use rate on Dual Magnum is about 2/3 the regular rate.

Fultime by Zeneca is their TopNotch + atrazine package-mix. I hope it handles better than some other encapsulated products!

Headline by BASF is a co-pack of Poast Plus + Laddok for use on SR corn. I like the SR corn concept, particularly where we have problems with bermudagrass (wiregrass). Headline's weakness will be in the control of triazine-resistant pigweed and common lambsquarters. Still will need to add Banvel to the mix.

Hornet is DowElanco's old Broadstrike Plus (Broadstrike + Stinger). I like this combination in no-till corn where Canada thistle is up at planting time. Burns the thistles down. As mentioned above, I prefer preemergence applications of Broadstrike with IR corn lines.

Liberty herbicide is part of the Liberty-Link program developed by AgrEvo. Liberty does a nice job postemergence on many annual grass and broadleaf weeds. Large grasses are a weakness. From what we've seen over the years, you may need to put a grass product down at planting and then come back with Liberty. Using Liberty alone has generally required two applications where severe weed pressure exists.

Lightning herbicide by Cyanamid is a mixture of Pursuit + Arsenal labeled for use on IMI corn lines. This one scares me from a resistance management standpoint.

Touchdown by Zeneca is their knock-down herbicide for use in no-till. It's very similar to Roundup and acts pretty much the same way.

SOYBEANS

As with corn, we have a number of new products coming to the market place real soon. The following is a list of these new prodcuts with a short description afterwards.

Action by Novartis was mentioned above in the corn section. It's basically a postemergence velvetleaf product like Resource.

Authority by FMC will be available under a number of names. Authority Broadleaf is FMC's package-mix of Authority + Classic. DuPont will have the same package-mix available under the trade name Canopy XL. Authority One-Pass is a package-mix of Authority + Command by FMC. Authority's strength lies in its preemergence activity on morningglory and nightshade. Yet, its morningglory control may not be 100%. Pitted morningglory sometimes escapes control. While Authority has some preemergence grass activity, it's not 100%. You may have to add a grass product to it, or apply it alone and follow up with a post grass product. Under cold, wet conditions, we may see injury. Also, the rotational restrictions are pretty stringent. Will Authority be available by itself? It depends upon whom you talk to!

Axiom by Bayer was mentioned above in the corn section.

Canopy XL by DuPont was mentioned above in the Authority section.

Dual Magnum by Novartis was mentioned above in the corn section.

Expert by Novartis is a postemergence sulfonylurea herbicide very similar to Classic. It's weak on lambsquarters as is Classic. Very good on giant ragweed and burcucumber.

FirstRate by DowElanco has both preemergence and postemergence activity. We've had real good results with this product over the past 2 years. Does a nice job (pre and post) on common ragweed, common cocklebur, pigweed and morningglory. Works pre on common lambsquarters but not post. Also does a nice job post on giant ragweed and burcucumber. Good crop tolerance.

Flexstar by Zeneca is Reflex plus a super adjuvant. It allows you to use Reflex on larger weeds plus it will now pick up common lambsquarters. Unfortunately, it can provide a lot of crop injury.

Liberty by AgrEvo was discussed above in the corn section. Eventually, we expect to see a Liberty-Link soybean available.

Raptor by Cyanamid is very similar to Pursuit. Used early post, it actually does a better job than Pursuit on annual grasses and common lambsquarters. I feel it has a shorter residual - have seen late-season grass escapes where we used it in wider row spacings.

Steel by Cyanamid is a package-mix of Prowl + Pursuit + Scepter. You basically get a full rate of Prowl, full rate of Pursuit and a half rate of Scepter. I will be interested to see how this one is priced. Should do a nice job.

Touchdown by Zeneca was discussed above in the corn section. Since it's chemistry is similar to Roundup, while it wouldn't be legal, Roundup-Ready soybeans may be tolerant to this product.

SORGHUM AND SMALL GRAINS

Peak by Novartis will be labeled for postemergence use in sorghum and small grains. Peak + Beacon are labeled in corn under the trade name Exceed. Peak does a nice job on a number of summer annual broadleaf weeds, plus it has some preemergence activity as well. In small grains, its biggest utility will be on the control of wild garlic/wild onion. Does a nice job on chickweed but may be weak on large henbit. Since there is a concern about carryover to soybeans, we may be limited to fall applications in small grains until we get the kinks worked out.

ODDS AND ENDS

If you read the Authority section above you noticed that FMC and DuPont seem to be working on co-marketing agreements. It appears that this relationship will carry itself a step further. FMC will also be marketing Assure II under the trade name Matador and Classic under the trade name Skirmish. I wonder who comes up with these names?

My original intention with the Maryland Weed Reporter was to update field faculty in Maryland and the surrounding states with new information on products, registrations, weeds, etc. A number of industry representatives approached me last year to see if they could get on my mailing list. We decided at that point to create a web site so anybody could take advantage of this document. I will still be mailing out hard copies to field faculty. Our web site is as follows:

 http://www.agnr.umd.edu/users/weed/

At this point we have last year's "Reporters" on the site. This will add a third "Reporter." Thus, you can either scroll through the site or find this "Reporter" located at:

 http://www.agnr.umd.edu/users/weed/weedrep3.htm

Dates to remember:

 -Delmarva Weed Tours - June 24 - 26.

 -Crop Management School (CCA training) - November 18 - 20 probably in Ocean City, MD (Princess Royale)

Messages:

Most of you know that I can be hard to reach at times. Yet, I frequently check all of my answering machines throughout the day.

 -Office phone/voice mail = 301-405-1329

 -Office FAX = 301-314-9041

 -Truck phone = 301-412-9858

 -Home phone = 301-490-4959

 -Email = RR24@umail.umd.edu

*Remember - leave me a phone number where you can be reached when you leave a message. Thanks!

Until next time,

Ronald L. Ritter

Extension Weed Control Specialist

Summer 1996 Issue of Maryland Weed Science

Fall 1996 Issue of Maryland Weed Science

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