“Long-term sunflower storage is typically targeted around 9-10%, but harvesting sunflowers with higher moisture can result in higher yields, less bird damage and less seed dropping and degrading from diseases. Under the current fall conditions, drying is probably mandatory so harvesting can be completed.” Read Harvesting High Moisture Sunflowers for some excellent harvest tips.
Don’t know how to test for moisture content in your sunflowers? Read Sunflower Mositure Content Bulletin.
Observations over the past week are showing that 65-70% of the sunflower crop has reached the R-9 stage, 15-20% are in R-8 stage and the last 10-15% are at the R-7 stage. Therefore, 20-30% of the sunflower crop is very susceptible to a killing frost.
Report includes frost update and harvest considerations.
To read the full report, click Sept 19 2014 MB Sunflower Crop Report
Is there another method to determine if sunflowers are ready to desiccate?
The answer is “yes”. This season many sunflower fields are not showing ALL the typical characteristics for physiological maturity, particularly brown bracts. Therefore, how can you tell if the sunflower seed moisture content is 30-35% moisture?
Click here to read our Sunflower Mositure Content Bulletin
With frost forecasted in the upcoming nights, read the bulletin below regarding maturity and the impacts of a frost on sunflowers.
“A killing frost in sunflowers is considered to be -4 to -5° C for 6 or more hours, as this low temperature for the extended period is required to penetrate the thick layer in the back of the sunflower head and start the dry down process.”
2014 Sept Frost and Sunflowers
Are you thinking about desiccating your sunflowers? Why should you consider desiccating your sunflowers?
Desiccation timing is approaching for sunflowers in some areas of the province. Sunflower planted between May 10-21 are reaching physiological maturing and timing for desiccation. Head rot is starting to appear in earlier seeded fields, and desiccation can allow you to start harvest before further disease sets in.
Click on the link to read our Desiccation Special Bulletin 2014
The sunflower crop continues to soak up the hot temperatures over the past two weeks and development is in the R6 stage for early planted crop and in the R4-R5 stage for later planted sunflowers.
Lygus bug nymphs and adults continues to be found, as counts in some areas are at or above economic threshold. (1 adult per 9 heads) Damage can occur until the seed shells have hardened sufficiently for the insect to no longer penetrate the shell, which starts at the R6-R7 stage.
Click to read the August 14, 2014 report
Join the NSAC and DuPont Crop Protection for an in-field interactive learning session on August 7, 2014 at 10:00 a.m. in the Elgin, MB area.
This will be a great opportunity to capitalize on an “in the field” learning session. DuPont will be showcasing some of their latest products that have come on the market as well as some helpful proactive scouting tips from our agronomy network.
RSVP today to:
Troy @ email@example.com or 750-1774
Stacy @ firstname.lastname@example.org or 204-384-6851
Click here to view the full invite.
The sunflower crop continues to accelerate through growth stages under the warm conditions. Early planted sunflowers in the R 5.1 to R 5.5 stage, with later planted sunflowers in the R-4 stage.
Lygus bug (Figure 1) numbers exceeding the economic threshold (1 adult per 9 heads) have been reported from many areas of the province. Sunflowers are susceptible to damage until the seed shells have hardened sufficiently for the insect to no longer penetrate the shell. Applications are best made in the evening (after 8 p.m.) to reduce damage to pollinating bees.
Click here to read the full report.
With the registration of fungicides for Sclerotinia head rot control in sunflowers, growers have an excellent management tool for reducing the impact of an economically devastating disease.
As the products and use is new to many growers, there are a number of question on timing.
- Sunflower staging: Target the R5.1 to R5.2 stage (10-20% disk flowers open)
- Field staging: 50-80% of heads at R5.1 to R5.2
- Number of applications: Depends of product. If registered and conditions good for infection a second application can be made 12-14 days after the first application
Expert advice from Dr. Khalid Rashid, Pathologist with AAFC Morden, who has tested the head rot fungicides and sunflower staging timing for over 10 years is that:
“The growth stage of R5.1-R5.2, until end of flowering (3 week window) is the most susceptible stage. The main factors for susceptibility are the availability of ascospores from mushroom production in adjacent fields (less are produced in the sunflower fields), and there is humidity in the air and on the sunflower heads, for ascospores to germinate and infect the heads. Sometimes, a second application 2 weeks after the first application may further reduce the disease infections. In some years/some fields get high late infection after the end of flowering due to a flux of ascospores production late in the season coupled with favourable humidity/rain conditions.”
As a follow up to our July 17, 2014 crop report, banded sunflower moth counts have increased. Refer to the chart for counts in your area. NOTE: The threshold is 1 banded sunflower moth per 2 plants.