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AgAlerts 2006 From Griggs County
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Issue # 3, June 22, 2006
Flea beetle collections will be held on Monday, June 26th and Tuesday, June 27th starting at 10:00 am to 2:00 pm at Butte Mchaud, 11 miles north of Cooperstown. The Griggs County weed board will supply paper bags and sweep nets. Bring coolers to transport the beetles to the desired release sites. For more information, contact the Extension Office @ 797-3312.
Soybean aphids have been found in eastern ND. Time to start scouting for this insect. The critical growth stage is the late vegetative (Vn) to early reproductive stages (R1-R2). Threshold levels are 25 or more aphids per leaflet. For more information and pictures of soybean aphids use the following link. Soybean Management for North Dakota.
Soybean cyst nematode were found in research plots in Richland County. Up to this time, this pest has not been a problem in ND. The extent of the problem has yet to be determined in Richland County or in ND, but the fact that it is here will start to change production practices for soybean. Soybean cyst nematode is a major problem in the corn/soybean belt. Soybean Cyst Nematode (SCN) is a worm-like organism in the animal kingdom that parasitizes plant root tissue. Plants infected with (SCN) will have poorly developed root systems that cannot utilize nutrients and water efficiently. The result is stunted, chlorotic plants. SCN can complete up to six generations per year depending on planting date and growing conditions. SCN can be spread by so or anything spreads soil such as win, water, animals (especially birds), and machinery. For more information on SCN use the following link. SCN
Alfalfa weevils have been in economic numbers in many alfalfa fields this year. If the first cutting hasn't taken place and there is heavy feeding injury to the top of the plant, cutting should be done. If the field has been hayed, monitor the new growth for feeding injury and determine if control measures should be done. Be sure to look in areas where the swaths laid since this is the area where the highest concentration of alfalfa weevil larvae are. For cleared insecticides, use the following link. Alfalfa Weevils
The amount of chlorotic soybeans this year is more than normal. This could be caused by the drier conditions and salts being pulled towards the soil surface. The amount of yield reduction will be determined by duration of the plants showing chlorosis. These plants will be stunted and have a reduced pod set. A good rain would help the plants recover from this injury. This would be a good time to map fields that are showing heavy amount of chlorosis mad make sure that the most tolerant iron chlorosis varieties are planted on these fields in the future. The NDSU yield trials list the iron chlorosis ratings for all varieties tested.
The University of Minnesota Crookston Research Station has report resistant wild oats to Assure II herbicide in one of their production fields and research plots. This can be of concern since many of our wild oat herbicides for small grains use the same mode of action. Assure II has ACC-ase inhibitor mode of action. Some of the herbicides with this type of mode of action include Discover, Puma, Fusilade DX, Select, Poast and Achieve. In the research plots, Poast had 40% control and Select and Select MAX had the best control or 95%. This will be something that growers should be looking for if they were disappointed in wild oat control. For more information on weed resistance, consult the NDSU Weed Control Guide.
Please Contact Our Office For Additional Information
E-mail: john.swenson@ndsu.edu
Go to the 2006 AgAlert Index Page