Pest Report Gleanings

Pest Report Gleanings

How to tell if you don't need Bt corn anymore and other tips.

The NDSU Extension Service is out with its first Crop and Pest Report of the growing season. I gleaned the following pointers from the publication, which can be found at http://www.ag.ndsu.nodak.edu/aginfo/entomology/ndsucpr/Years/2011/5May11.pdf.

Don't need Bt corn? Scout for European corn borer and corn rootworm egg masses and/or larvae in late July or early August, or split corn stalks open this fall to find over wintering larvae. You may find you don't really need to buy Bt corn to control these insects anymore. Corn borer populations have generally decreased throughout the Cornbelt. Corn rootworm, another insect controlled by biotech corn, usually isn't a problem in North Dakota. Also, high populations of black cutworm, corn earworm and western bean cutworm are not typically seen in North Dakota. So, avoid ordering Bt corn with traits for suppressing or control them.

Get ready for midge. The Orange Wheat Blossom Midge is going to be a problem for spring wheat in some areas. Over wintering populations are high and with the late planting season there's little hope that the wheat will flower before the midge emerges. Be ready to scout at flowering.

Fy on canola. It always best to seed canola in a way so that uniform depth can be obtained. However in a pinch, some farmers have distributed canola seed with fertilizer to save time. It's best to harrow the field after spreading the seed and fertilizer rather than leaving the seed on the soil surface.

Boost rates. If you're seeding wheat after its optimum planting window, it's best to boost the seeding rate by 1% per day of delay, up to a maximum of about 1.6 to 1.8 million seeds per acre. The increase will partially compensate for the expected reduced tillering associated with late planting.

Switching crops could backfire. Don't be in a hurry to switch from wheat to corn if planting is delayed. The move could backfire if spring and summer remain cooler than normal, which is predicted for the much of the Dakotas.

Beets under pressure. Protect late-planted sugarbeets from Pythium, Aphanomyces and Rhizoctonia. They all like warmer, wetter soils. Getting protection from Rhizoctonia damping off or root may be tricky, though. Currently, sugarbeet seed isn't treated with anything that provides effective control. Headline at 6-12 fluid ounces and Quadris at 9.2 fluid ounces per acre, applied in-furrow or a T-band have provided effective control in some limited research in the Valley. Treatments were tested without the use of starter fertilizer.

Live with dandelions. You're probably going to have to live with the dandelions in fields. Nothing does a super good job of controlling them at this late date. Spraying in the fall works better, if you can find the time to get the job done. Pre-emergence herbicides may be the best option, but more research is needed to identify effective products.

 

Hide comments

Comments

  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Publish