Crop & Pest Report



wdsci.zollinger.3.herb sheet

Nano Adjuvants (07/30/15)

Beginning in late winter and early spring I was contacted by many folks in the region about media adds of adjuvants that contain nano-materials.

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DEET as an Herbicide (07/30/15)

Question: I have an interesting question for you. Word around the local coffee table, is that using a 40% Deet insect repellent kills weeds… A producer is “experimenting” with it in his lawn and he showed me that it does work. It killed the dandelions, lambsquarters, common mallow, etc. The grass surrounding the weeds looks like it was killed too. However, my question is, will anything grow back at all after it has been sprayed with a 40% Deet?! Is it the Deet that’s killing the plant? Any thoughts, comments?

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Male Palmer Amaranth Plants (07/30/15)

In the last issue of the NDSU Crop and Pest Report (#12) I included information on Palmer amaranth. In the article I indicated the following: Below are reasons why it is being called “Satan” and why growers should quickly destroy any plants found. #7. Female plants can grow to more than 10 feet tall with a 5-6 inch stem girth and seed heads more than 1 foot in length. Male plants are small and generally non-competitive.

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Waterhemp is Moving North in the Red River Valley (07/23/15)

I stated in winter meetings the ‘waterhemp line’ or fields where waterhemp could be scouted for and found in corn, sugarbeet, soybean or small grains fields was somewhere between Wahpeton and Fargo in 2014.

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Palmer Amaranth – A Plant Form of Cancer (07/23/15)

In the very small chance that readers have not heard of Palmer amaranth nor heard of the devastation it can inflict, here is a summary:

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Foxtail Barley Control (07/23/15)

The following information is from email correspondence with Dr. Rod Lym, NDSU Weed Scientist. Question: What are some good recommendations for control of foxtail barley in pasture - what about tips when applying Plateau and is this a good option?

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Managing Weeds on the Edges of Fields (07/16/15)

I notice road ditches and edges of fields are beginning to dry out following what seems to be very regular precipitation in May, June and early July.

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Hydrogen Peroxide as a Water Conditioner Adjuvant (07/16/15)

Question: Some growers are looking at using industrial grade hydrogen peroxide as a water conditioner to replace ammonium sulfate under the assumption that it will “fix” hard water and offer uptake into the plant. They will be mixing it (at a 1 quart use rate) with the herbicides, insecticides, and fungicides in all their crops except for wheat. One grower in particular has been using industrial grade hydrogen peroxide for a few years and says he’s seen better herbicide efficacy. He also uses it as a “fungicide” in his wheat at heading and for cercospora control in sugarbeets. Is there any validity to these statements?

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Difference in NIS Brands? (07/16/15)

Question: Is there a difference in the quality of adjuvant between X NIS and Y NIS? I noticed that you listed both of them in the weed guide as an NIS. Does that mean that they are similar in activity or just classified as an NIS by the company?

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Drift from Glyphosate (07/16/15)

The following is an email response from Dr. Kirk Howatt, NDSU Weed Scientist, to a question received about assessing glyphosate damage:

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Palmer Amaranth - Update (07/09/15)

There was a concerted effort this past winter meeting season from NDSU Extension specialists and agents to bring the issue to growers of Palmer amaranth movement northward toward North Dakota.

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Water Conditioning through an Injection Sprayer (07/02/15)

Question: A grower has an injection sprayer and has treated the spray solution with a water conditioner. Since I am injecting glyphosate into the water stream and then is ejected out the nozzle a second later, is the water conditioner adjuvant actually doing anything?

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Equation Used to Calculate Rate of AMS (07/02/15)

Question: Several of my growers have been using the formula listed in section #11 on page 72 in the 2015 ND Weed Control Guide to assess their water quality and AMS requirements:

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One Persons Weed is another Person’s Ingredient for Salad (06/25/15)

I live in an area of south Fargo that is under residential development. There are very few homes in my part of town and plenty of weeds along recently constructed roads. I noticed a group of people harvesting lambsquarter leaves recently. I was surprised and went to the internet to investigate lambsquarters as a source of food for human consumption.

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wdsci.peters.2.herbicide carryover mn

Plant Sugarbeet into Fields with Known Herbicide History (06/25/15)

Last week I walked a sugarbeet field with nearly 100% stand loss on the low organic matter, eroded, higher elevation areas of the field.

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Barley Injury following Pursuit and Raptor (06/25/15)

Question: In this area of the state soil pH is 5.4-6.0 and organic matter is 3.2-3.5%. Some growers are planting barley on sunflower stalks treated the prior year with Beyond herbicide at 4 fl oz/A.

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wdsci.zollinger.1.oil adjv rates chart

Use of HSMOC Adjuvants with Herbicides (06/25/15)

I have been getting many questions about the use HSMOC adjuvants. These questions show the confusion about use and function of this adjuvant type.

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wdsci.peters.1.redroot pigweed near foxhome mn

Waterhemp has Emerged in Row-Crop Fields (06/18/15)

Part of the weeds management strategy is properly identifying weeds in the field. Pigweed identification is especially difficult in the early seedling stages since many species look the same. A ‘pigweed identification guide’ developed at Kansas State University is available.

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Curtail M Rates in Flax (06/18/15)

Question: I am having difficulty reconciling the flax use rate for Curtail M listed in the ND weed guide at 1.33 to 1.75 pt/A to the rate of 0.85 pt/A listed in the Flax section of the federal Curtail M label. Can you tell me what I am missing?

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