Crop & Pest Report
RED SUNFLOWER SEED WEEVIL adults will begin to emerge in late July and continues until mid-August. Adult weevils are reddish brown and ⅛ inch long.
This insecticide trial was conducted near Mapleton, ND in 2010. Trial was arranged in a RCBD design with 4 replications. Three different mode of actions were tested: organophosphate - OP (Lorsban), pyrethroid – P (Asana) and OP + P (Cobalt).
Dragonflies belong to the Order Odonata and there are about 400 species in United States. There are many dragonflies flying around fields and yards this year.
Last week in the Crop and Pest Report, I included a short article about green-snap in corn and the yield losses associated with this phenomenon. I did not mention root lodging in that article, primarily because most of the damage that I observed was due to green-snap and there was little root lodging.
In a normal year more than 50% of the sunflower acres are planted by May 29th. Based on the 2011 North Dakota Agricultural Statistics Service, 64% of the sunflower crop in ND was planted by June 12th.
The sugarbeet crop is off to an unusually late start, one year after the earliest planting ever. Typically, all things equal, later plantings have lower yields than earlier plantings. As such, all the sugar cooperatives in our area increased their planted acreage by about 5% so that they will have enough beets to fully utilize the processing capacities of their factories.
NDSU IPM field scouts looked at just 43 wheat fields during the week of July 18-22, but it was clear that disease pressure had increased with the continued rains and very warm temperatures.
Last week I said that pathogen resistance to either Idol and Apronmaxx had not been identified.
Dry bean rust has not been reported in the region yet this year, but conditions are favorable for rust infection and development (humid, heavy dews, warm temperatures). I would encourage growers to scout for dry bean rust in the upcoming weeks.
In some of my corn N plots this season on high clay soils in the Valley, I am certain that we lost over 100 lb/acre of N. If the corn is not yet tasseled, given the price of corn right now, application of reasonable rates of N will be profitable.
Last week I reported on top yellowing and striping on some corn with restricted root systems in the wet high clay soils in the Valley. A little less than a week ago I applied the equivalent of 10 lb S/acre as gypsum granules and about 10 lb Zn/acre as zinc sulfate granules to an entire N rate study between Mapleton and Casselton on high clay, very wet soils.
Sharpen is a new desiccant from BASF that is expected to be registered for use on dry beans by fall in time for desiccation of this year’s dry bean crop. In NDSU trials, Sharpen has been as effective, and sometimes more effective, than Valor, which has become a standard in dry bean desiccation.
Most growers are controlling weeds in most crops with herbicides only. The advent of Roundup Ready crops has allowed growers to achieve nearly perfect weed control in the beginning.
It is that time of the season when herbicide applications for sugarbeet should be ending. However, due to late planting, frequent wet periods, and herbicide-resistant weeds, herbicides are still being applied to sugarbeet.
The historic floods of 2011 caused millions of dollars in damage and have imposed great hardship on those affected. These floods will negatively impact the trees and forests within these areas as well.
An aerial forest health survey of the Turtle Mountains by the North Dakota Forest Service, in cooperation with the US Forest Service, in June revealed an outbreak of large aspen tortrix (Choristoneura conflictana).
Millions of acres in North Dakota could not be planted this year because of wet conditions. This has many producers considering cover crops on prevented planted acres.
Information from North Central ND, including updates on wheat midge, small grain diseases, sunflower downy mildew, and sunflower insects.
Information from Southwest ND.
Maps detailing precipitation, temperature, and departure from normal corn and wheat accumulated growing degree days.