Volume 33, Issue 05 | July 9th, 2020
Download the pdf: Volume 33 | Issue 05, 2020
IPM FOR DISEASES AND INSECT PESTS
This week’s Crop and Pest Report is exploding with articles for insect pest and disease management. Many are very timely as the high heat and humidity continue to push insect and disease development!
SUNFLOWER
SUNFLOWER INSECT TRAPPING UPDATE—Sunflower trap numbers were low this week. Continue monitoring for economic thresholds.
MYSTERY INSECT—The Sunflower Bud moth has been spotted in the area. Growers and agronomists often see the larval feeding injury first – deformed heads or stalks with black frass near the entrance hole. Most years, the sunflower bud moth is not economic in sunflowers. There are no developed IPM scouting or management strategies.
Extension Entomologist
SCLEROTINIA RISK AND WHITE MOLD ON BROADLEAF CROPS
White mold is a concern in most broadleaf crops once they enter bloom. Fungicides can help manage the disease and in many cases can be very effective when timed correctly. Application on Dry Bean and Canola can be beneficial in favorable environments. Though Sunflower also tend to be very susceptible to white mold, fungicides are not always recommended because of economic return and effectiveness of application. Soybeans tolerance seems somewhat dependent on variety, and again, the economic return can vary.
The map to the left is the Canola Sclerotinia Risk map. Because it uses environmental conditions favorable for sclerotinia, it can be useful for all broadleaf crops on assessing white mold risk development.
There are great resources available on the Carrington REC website related to improving management of white mold in Sunflower, Soybean and Dry Bean. Carrington has one of the best white mold field-research programs in the world.
Source: Review of Condition Favorable for White Mold (07/14)
DRY BEAN, SOYBEAN
Now is a good time to look for SCN—Soybean Cyst Nematode sampling has been encouraged for a number of years, with “free” bags sponsored by the ND Soybean Council available to farmers. Scouting for SCN can begin now. SCN affects both Soybean and Dry Bean. SCN moves with soil, and with the recent rains we’ve had, check low areas and field entrances for SCN. It’s relatively easy to spot against black soil. Click the link above for full article in this week’s CPR.
The only way to know if you have it is to look for it, and test for it. Take the test to beat the pest!
WHEAT
According to the Midge Growing Degree Day Model, Grand Forks County is sitting between 1550-1738 Midge Degree Days. Over 90% of females will have emerged by the end of the week in the entire county (1600Degree Days reached). The annual soil survey conducted in the fall of 2019 in North Dakota indicated increasing levels of overwintering wheat midge larvae for the 2020 season. An area considered moderate risk for midge was the Northeast Corner of Nelson County. Wheat Midge is not currently monitored by fall soil surveying in Grand Forks County.
Later seeded wheat that is in vegetative stage, or just starting to head out should be monitored for midge and scouted during the susceptible crop stage: heading to early flowering (<50% flowering). Scout at night using a flashlight to slowly scan the heads for adults and counting the number of flies per head. Look for tiny, orange adult flies when temperatures are greater than 59 F and the winds are less than 6 mph at night, after 9PM. If the economic threshold is met, follow these guidelines for treatment.
The economic thresholds for wheat midge in HRSW is one or more midge observed for every 4-5 heads
FUSARIUM HEAD BLIGHT RISK UPDATE
With wheat at all different stages in the county, and sometimes even within a field, FHB or scab risk continues to stay elevated, especially for susceptible varieties. The best time to apply fungicide for scab in wheat is at early flowering and up to seven days after the start of flowering. In barley, the best time to apply is at full-head and up to seven days after full-head. See last week’s Ag Alert or Crop and Pest Report for photos of crop stages.
According to Jochum Wiersma with Minnesota Extension, choosing a fungicide can be challenging as plant health and yield potential may continue to be effected by heat and water stress. The retail cost of tebuconazole is lower, while Prosaro/Caramba/Miravis Ace improve suppression of FHB by about 15-20%.
PROJECT SAFE SEND—DISPOSE OF PESTICIDES SAFELY
From the Department of Ag Website:
Farmers, ranchers, pesticide dealers and applicators, government agencies and homeowners with unusable pesticides can bring them to any of the Project Safe Send Sites listed below.
Project Safe Send is a safe, simple and non-regulatory program that helps people safely and legally get rid of unusable pesticides free of charge. Since 1992, more than 10,000 people have brought in over 4.7 million pounds of pesticides to Project Safe Send.
The program accepts old, unusable or banned pesticides, including herbicides, insecticides, rodenticides and fungicides. For a list of accepted items, click on Accepted Pesticides. The collected pesticides are shipped out of state for incineration. Project Safe Send is funded through product registration fees paid by pesticide manufacturers.
People are urged to check their storage areas for any unusable pesticides and safely set them aside for Project Safe Send. If the containers are deteriorating or leaking, pack them in larger containers with absorbent materials. Free heavy-duty plastic bags are available from the North Dakota Department of Agriculture.
Contact Jeremiah Lien at jjlien@nd.gov or 701-425-3016 to pre-register.
NOTE - NEW THIS YEAR: Shuttles are not accepted and a maximum of 3,000 pounds of pesticides per participant will be accepted.
2020 Project Safe Send Sites
8 am - 12 pm (local time) at North Dakota Department of Transportation (NDDOT) facilities
See a full list of sites at NDDA Site.
GRAND FORKS WEED BOARD NOTICE—CHEMICAL COST SHARE
The Grand Forks County Weed Board will be offering cost share chemicals to registered landowners. A current license is required to purchase Tordon. Cost share chemicals will be Amine, Freelexx, Curtail, Milestone, Tordon, and Overdrive.
Please contact:
Kevin
1637 15th Avenue NE (1/2 mile west of CR #5 and 32nd Ave South)
Grand Forks, ND 58201
218-779-4709
Chemicals will be available Monday, August 3, 2020 through Friday, August 7, 2020 from 7:30 a.m. 4:30 p.m.
EVENTS THIS SUMMER
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Ag Marketing Outlook Webinars, live every other Thursday @ 12:30pm
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Youth Land Judging/Soil Management Workouts; Thursday afternoons in Larimore. Contact MaKayla Fleming for more information or to sign up.
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Virtual North Dakota Research Extension Center’s (REC’s) Field Days around the state July-August 2020
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A 20/2020 Look at Ag Health, Safety and Wellness Online Expo—August 11-13th
