Crop & Pest Report
We have not evaluated fungicides for stripe rust control in ND, but wheat pathologists from states (such as KS, NE, AR, WA, OH) with a long history of stripe rust have, over many locations and years.
Wheat: Last week, ND IPM scouts looked at 77 wheat fields. The average growth stage was mid- to full head emergence.
As canola enters bloom it becomes susceptible to white mold. Growers may be considering applying a fungicide to help manage the disease.
This season the relative incidence and severity of iron deficiency chlorosis (IDC) surprises even me. During the last 10 years, the presence of IDC and its severity seemed to be related to particularly wet areas of the field.
As crop prices have increased, so has the increase in the use of plant analysis. I generally think that this is a good trend, but the manner in which most are used is questionable. The correct use of plant analysis is as follows:
In a previous CPR, I stated that no-till corn was never a good idea. That statement was made in reference to wetter soils in the eastern part of the state, and I also stated that strip-till corn was a better option.
Growers are dealing with several challenges controlling weeds with herbicides this season:
Limited herbicide availability: At the heart of this spray season there may limited supplies of certain herbicides, including Raptor and Beyond. Chemical companies are trying to move product from other markets to fill lack of supply, but may not be able to move sufficient amounts. There may be other options for in-crop weed control. Use alternative tools if possible.
The amount of acreage planted to LibertyLink soybean this spring increased drastically. We are receiving reports that Liberty is not completely controlling weeds.
Two Weed Science Field Days are quickly approaching, one on July 3rd and the other on July 12th.
Populations of aphids that infest trees are generally higher, earlier in the summer than usual. This has led to a marked increase in homeowner requests for assistance on how to manage this common pest.
Maps detailing precipitation, temperature, and departure from normal corn and wheat accumulated growing degree days.
Aphids have been observed on canola near Minot in Ward County, Underwood in McLean County, McHenry County and northeast Hettinger County.
The distribution map (shown) depicts the 2012 forecast for populations of wheat midge from the surveyed areas of North Dakota.
The first banded sunflower moth of the season was captured in a pheromone trap located at Mapleton, Cass County, ND. This is about two weeks earlier than last year.
Although safflower is relatively insect-free, larvae of sunflower moth were observed in safflower in central South Dakota near Hayes in Stanley County.
The number of soybean acres in North Dakota has increased to around 4 million acres annually. Soybean growth and development is influenced by heat units and by photoperiod.
A few more observations of wheat leaf rust have been reported this past week, but the big news now is that stripe rust has increased substantially over the past week in some areas.
After the second or third trifoliate has emerged it is a good time to evaluate the nodulation of the soybean plants (Figure 1). When the nodules are cut open they should have a healthy pink to red color on the inside.
It is that time of the season where certain herbicides may no longer be applied to sugarbeet due to the preharvest interval (PHI) listed on the herbicide label.