@RPMcrops

Agronomist. Always learning never surrendering, OTSS. Tweets and opinions here are my own.

Joined May 2012
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  • Followers409
936Media
Tar spot and southern rust much less severe than last year. Picture is worst leaf I could find
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June 10th okay, but July 10th? Field had one of our better giant ragweed products applied too. Might be making an attempt to unseat waterhemp as the most troublesome weed.
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Ryan Miller retweeted
ISU NC Crops@nciacropsJul 2
It takes me a bit to calibrate. When I 1st found the leaf in photo 1, thought it was Gray Leaf Spot, but then I held it up to light and saw the yellow halo photo 2. Was sure it was Bacterial Leaf Streak, which isn't managed w/ fungicide. Thanks @alisonrISU for confirmation.
Corn leaf that looks like Gray leaf spot, but is bacterial leaf streak.

ALT Corn leaf that looks like Gray leaf spot, but is bacterial leaf streak.

Corn leaf show irregular lesion margins in between veins and the yellow halo indicating it is bacterial leaf streak.

ALT Corn leaf show irregular lesion margins in between veins and the yellow halo indicating it is bacterial leaf streak.

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Field School for Ag Professionals is coming up! Learn to identify and compare the growth habits of both standard and short-stature corn hybrids - planted side-by-side on the same day. Full agenda and registration at: z.umn.edu/AgFieldSchool2026 @UMNExt @UMNswac #MNag
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Rochester Crop Management Tour, this Tuesday June 30th. blog-crop-news.extension.umn…
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I’m expecting some interesting differences in the oat by nitrogen rate trial in Rochester MN
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June 19. Giant ragweed still emerging as a killdeer is hatching
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True armyworm outbreaks in progress. blog-crop-news.extension.umn…
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Ryan Miller retweeted
Rodrigo Werle
@WiscWeedsJun 3

Dry Weather and Residual Herbicides: What Should Growers Expect?

Article · @WiscWeeds
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Picture from SE Minnesota. blog-crop-news.extension.umn…
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Spore sampling project.
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Ryan Miller retweeted
Rodrigo Werle
@WiscWeedsMay 28
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Cool and relatively dry conditions but waterhemp still thriving
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Confirmed. Winter barley doesn’t like MN winters
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Join us TOMORROW (Wednesday, Jan. 14) at 9am for a webinar on "Edge of field technology for managing nitrate losses." Register now: blog-crop-news.extension.umn… @UMNExt #MNag
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Finding some 300+ bushel corn in Winona county today.
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Ryan Miller retweeted
Bruce Potter@SWMNpest15 Sep 2025
A consultant in SC MN sent photos of severe fall armywom infestation in an oat cover crop. The larvae were nearly full grown. It might be worth checking any emerged fall cereals, lush grass hay ground an possibly very late-planted sweet corn.
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Another weed species up to no good.
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‼️REMINDER ‼️: Today’s the last day to sign-up for our Strip-Till Field Day on July 30th! ✅Identical AM and PM sessions ✅ static displays ✅ lunch speaker ✅ 2.5 SW CCA credits! No cost to attend. Register at 🔗go.iastate.edu/striptill #StripTill #ISUCrops
Strip-Till Field Day on July 30th at the ISU Southeast Research and Demonstration Farm (3115 Louisa-Washington Rd, Crawfordsville, IA). AM Session: Registration: 8:30 | Field Demos: 9:30 to 11:30 Lunch: 11:30 AM to 1:30 PM | Lunch speaker at NOON PM Session: Registration: 12:30 | Field Demos: 2 to 4. Pre-register by July 23, 2025. No cost to attend the field day. Prior to the National Strip-Till Conference, July 31 & Aug. 1. Learn more and register at go.iastate.edu/strip-till. Picture in the background of strip-till field with the ISU Extension and Outreach wordmark.

ALT Strip-Till Field Day on July 30th at the ISU Southeast Research and Demonstration Farm (3115 Louisa-Washington Rd, Crawfordsville, IA). AM Session: Registration: 8:30 | Field Demos: 9:30 to 11:30 Lunch: 11:30 AM to 1:30 PM | Lunch speaker at NOON PM Session: Registration: 12:30 | Field Demos: 2 to 4. Pre-register by July 23, 2025. No cost to attend the field day. Prior to the National Strip-Till Conference, July 31 & Aug. 1. Learn more and register at go.iastate.edu/strip-till. Picture in the background of strip-till field with the ISU Extension and Outreach wordmark.

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When will giant ragweed stop emerging in 2025?
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