ALERT: high black cutworm levels in Parkhill and Watford areas

Eric Richter, Syngenta Seeds has seen several fields in these area’s with what he has described as “… the highest levels I’ve seen in my career…”.  In these cases the hybrids with no genetic protection (i.e. that don’t have traits such as Agrisure Viptera 3111) are being completely wiped out.  Make sure you are checking your fields especially if you are in a typically high risk area (north of Lake Erie).  See blog article below for more cutworm details.

There are lots of different insects and issues out there this year so make sure you keep an eye on your fields.

Plant Stand assessment – improved accuracy with measuring wheel.

If you have ever been frustrated trying to get an accurate plant population for an emergence issue using 1/1000th of an acre count there is a better method. For the last few years I have been using the measuring wheel method and have more confidence in my plant stands. The benefits of using this method are reduced ‘cherry picking’ of visually good or bad areas of the field, speed of count and improved accuracy of the count.

How does it work?

To use this method of population counts you push the measuring wheel and count 150 plants (I count by two’s, if you are really good you can count by three’s). When you reach a count of 150 plants, record the distance traveled in feet. Sorry no metric here record the measurement in feet. Repeat the count/measure three or four more times in the field or affected area. Average the measurement and convert using the following table by dividing the average number of feet for 150 plant count into the conversion factor. Example if I averaged 100 feet in a 30 inch row spacing the population would be 26,613 plants per acre (ppa) (2,613,600 divided by 100 feet = 26,136 ppa).

Also, assess non-emerged seedlings using the checklist in the Replant corn – How to decide article, by recording the population and the emergence issues we can make a good agronomic decisions for this year and future years.

Emerged Corn Herbicide Options

Due to the wet conditions this spring, the corn that did get planted is currently at pre-emergent to 1-2 leaf stage. If you were planning on making a pre-emergent application on emerged corn need please pay careful attention to their herbicide program so that you don’t risk crop injury and possible yield loss.*
So what are some of my options?
1. There’s still time to protect against yield loss from early weed competition. Going in pre to early post is the best choice to keep your fields clean during the critical weed free period.
2. Time is running short – choose a one-pass treatment that will take you through the season so you can avoid making a second application. One-pass and DONE.
3. Don’t spray glyphosate alone. Utilize a residual product(s) with your glyphosate to maximize your weed control, to reduce the need for a second application and help manage resistance on your farm.

For pre-emergent up to the 2 leaf stage of corn:
1) Stick to a pre-emergent application of Callisto® plus Primextra® II Magnum®. Or, if grassy weeds are getting beyond the 2-leaf stage in your glyphosate-tolerant corn, add in Touchdown Total®.

Beyond the 2-leaf stage up to 6-leaf corn (glyphosate tolerant corn):
If the corn crop has reached the 2-leaf stage, then switch to Halex® GT. Alternately, you could choose a tank-mix of Callisto + Primextra II Magnum + Touchdown Total for a one-pass contact and residual treatment.
*Refer to the label for a complete list of weeds, registered rates and timings. Please consult with your input supplier or local Syngenta representative for more information.

Replant corn – How to decide.

This year we had some fields that were planted early and then went thorugh a very wet, cold period and now the emergence is less than desirable in some areas of the field. Do I replant the poor sections, or the whole field (with the price of corn this would be a very costly option), do I leave it alone, these are all very good questions.

Corn replant decisions are difficult. The following table can be utilized as a guideline when assessing yield potential at various planting dates and populations. In general it doesn’t pay to replant corn where populations of healthy plants are greater than 18,000 plants per acre

First we need to establish the population that has emerged. You can do this by counting the number of plants in 1/1000 of an acre (see chart). Do this a number of times in the field. Also, assess the cause of reduced emergence using the following checklist.

 Rotted seed or seedlings
 Sprout twisted or leaves expanded underground
 Seeds hollowed out (insect damage)
 Check seed intactness (firmness)
 If seed is watery or “yellowy pus” it is not going to emerge
 Do not worry about crooks or turns of the coleoptile (shoot) as it may be responding to the seed orientation (corn seed does have an up and down side); also, cold soil will often disorient coleoptile growth.

As this is a very difficult decision please contact your NK field representative or seed dealer if you have any questions.

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