Authored by Bob Hartzler

Dicamba-resistant Waterhemp in Iowa ICM News
A New Palmer Amaranth Find Underscores Importance of Scouting ICM News
Fall Burndown Treatments for Winter Annual Weeds ICM News
Prioritize Pasture and Non-crop Weed Control! ICM News
Show Off Your Skills at the Iowa State Fair Weed Identification Contest Blog Post
Equisetum: From the Ditch to the Field ICM News
Pasture Weed Control ICM News
Managing for 2022 Volunteer Corn Potential ICM News
2021 Palmer amaranth Tour: Old Habits Die Hard Blog Post
Palmer Amaranth in Iowa: Past, Present and Future Blog Post
Effective Spring Management of Multiflora Rose ICM News
Adjusting Weed Management Plans After The Dry Start ICM News
To terminate or not to terminate? ICM News
Preemergence Herbicides, Dry Soils and Rain ICM News
Expectations for Volunteer Corn This Spring Blog Post
Field pennycress Encyclopedia Article
Protection of Endangered Species where Xtendimax, Engenia and Tavium will be applied. Blog Post
Will a dicamba-resistant waterhemp be resistant to 2,4-D (and vice versa)? Blog Post
2021 Iowa Herbicide Guide now available Blog Post
Metabolic resistance in Palmer amaranth Blog Post
Time to Finish Up Fall Weed Management! Blog Post
Use of dicamba on dicamba-resistant soybean Blog Post
How much corn seed has germinated in Derecho damaged fields? Blog Post
VIDEO: Management of Volunteer Corn Blog Post
2020 Western Iowa Palmer Amaranth Tour Blog Post
Management of Volunteer Corn in Fields Affected from Derecho Blog Post
An Open Letter to the EPA Blog Post
Using Cereal Rye Cover Crop and Narrow-Row Soybean to Manage Herbicide-Resistant Waterhemp ICM News
Scout Now for Palmer Amaranth ICM News
Unsolicited seed packages in mail ICM News
Dicamba 2020: What went wrong in Iowa? Blog Post
Dicamba: What does the research say? Blog Post
Identifying Common Herbicide Symptoms in Soybean Blog Post
Impact, Armezon carryover injury observed in northwest Iowa Blog Post
Weed Suppression With Cover Crops: It's All About Biomass Blog Post
Managing Herbicide-Resistant Waterhemp in Dicamba-Resistant Soybean Blog Post
Herbicide Carryover Concerns for 2020 Blog Post
Weed Identification Fact Sheets Encyclopedia Article
Give the people what they want: Another entry into the HAHOS Blog Post
Wild four-o-clock Encyclopedia Article
To spray or not to spray? Blog Post
What’s Happening To My PRE herbicide on the Soil Surface? Blog Post
Preemergence Herbicide Application Timings: Pros and Cons ICM News
Terminating Cover Crops This Spring ICM News
Managing Winter Annual Weeds this Spring ICM News
Managing Residual Herbicides with Cover Crops ICM News
It's Back: The Herbicide Ad Hall of Shame Blog Post
A look at changes in common names of Iowa weeds Blog Post
Waterhemp: A 'friendly' native evolves into the Cornbelt’s worst weed problem. Blog Post
Waterhemp Seed Retention for Harvest Weed Seed Control Blog Post
Fall Burndown Treatments for Winter Annual Weeds ICM News
October 21 Harvest Weed Seed Control Clinic Blog Post
Fall Weed Control in Pastures ICM News
Survey of Herbicide-Resistant Waterhemp in Iowa Corn and Soybean Fields ICM News
2019 Western Iowa Palmer Amaranth Tour Blog Post
Can Weed Seed Production be Reduced with Late-season Herbicide Applications? ICM News
What is a realistic goal for weed management? Blog Post
2019 Iowa State Fair Weed Identification Contest Results Blog Post
Scout Now for Palmer Amaranth ICM News
Q and A: Why Doesn't Iowa Do Something About Wild Parsnip? Blog Post
Test Your Weed Identification Skills at the Iowa State Fair Blog Post
Another bumper year for wild parsnip Blog Post
Staying on Top of Weeds in 2019 ICM News
UAN and herbicide applications on emerged corn Blog Post
Weeds in a Wet Year ICM News
iNaturalist: Confessions of a skeptic Blog Post
Impact of cover crops on weed management Blog Post
Changes to Iowa's Noxious Weed Law Blog Post
Spring Cover Crop Termination ICM News
Spring Burndown Treatments for Winter Annual Weeds ICM News
Metabolism-based resistance - Why the concern? Blog Post
Achieving Full-season Waterhemp Control in Soybean ICM News
“Why can’t you academics get your stories straight?”, or “What is the optimum soybean seeding rate?” Blog Post
Herbicide program development: Long-term planning Blog Post
Harvest Weed Seed Control Blog Post
Herbicide program development: Herbicide rate calculations Blog Post
Herbicide program development: Using effective herbicide groups Blog Post
Herbicide program development: Using multiple sites of action Blog Post
Moving Forward with Dicamba ICM News
New dicamba restrictions Blog Post
Milkweeds, Monarchs, and Crop Production Blog Post
Harvest Considerations to Reduce Weed Seed Movement ICM News
2018 Labor Day Palmer amaranth tour Blog Post
Banner year for the weedy cukes Blog Post
Dicamba 2018 - The Iowa Experience ICM News
2018 State Fair Weed ID Contest Results Blog Post
Mile-a-minute weed found in Iowa Blog Post
Herbicide drift in 2018: How are we doing? Blog Post
Crop Injury Associated with Growth Regulator Herbicides ICM News
Wild violet (Common blue violet) Encyclopedia Article
Puncturevine Encyclopedia Article
Blackseed and broadleaf plantain Encyclopedia Article
Waterhemp Encyclopedia Article
Common sunflower Encyclopedia Article
Fall panicum Encyclopedia Article
Shepherdspurse Encyclopedia Article
Wild parsnip Encyclopedia Article
Wild carrot Encyclopedia Article
Redroot pigweed Encyclopedia Article
Poison ivy Encyclopedia Article
Woolly cupgrass Encyclopedia Article
Shattercane Encyclopedia Article
Downy brome Encyclopedia Article
Scouring rush Encyclopedia Article
Giant foxtail Encyclopedia Article
Jimsonweed Encyclopedia Article
Wild four-o' clock Encyclopedia Article
Eastern black nightshade Encyclopedia Article
Curly dock Encyclopedia Article
Yellow woodsorrel Encyclopedia Article
Venice mallow Encyclopedia Article
Green foxtail Encyclopedia Article
Goosegrass Encyclopedia Article
Garlic mustard Encyclopedia Article
Foxtail barley Encyclopedia Article
Field bindweed Encyclopedia Article
Prostrate spurge Encyclopedia Article
Yellow nutsedge Encyclopedia Article
Honeyvine milkweed Encyclopedia Article
Hairy galinsoga Encyclopedia Article
Giant ragweed Encyclopedia Article
Asiatic dayflower Encyclopedia Article
Dodder Encyclopedia Article
Prickly lettuce Encyclopedia Article
Japanese knotweed Encyclopedia Article
Motherwort Encyclopedia Article
Common and cutleaf teasel Encyclopedia Article
Common pokeweed Encyclopedia Article
Yellow foxtail Encyclopedia Article
Ground ivy (Creeping Charlie) Encyclopedia Article
Multiflora rose Encyclopedia Article
Kochia Encyclopedia Article
Palmer amaranth Encyclopedia Article
Russian thistle Encyclopedia Article
Witchgrass Encyclopedia Article
Velvetleaf Encyclopedia Article
Smilax (greenbriar) Encyclopedia Article
Spiny sowthistle Encyclopedia Article
Sericea lespedeza Encyclopedia Article
Nimblewill Encyclopedia Article
Quackgrass Encyclopedia Article
Poison hemlock Encyclopedia Article
Musk thistle Encyclopedia Article
Leafy spurge Encyclopedia Article
Large crabgrass Encyclopedia Article
Ivyleaf morningglory Encyclopedia Article
Hemp dogbane Encyclopedia Article
Hedge bindweed Encyclopedia Article
Horseweed (marestail) Encyclopedia Article
Buckhorn plantain Encyclopedia Article
Black medic Encyclopedia Article
Barnyardgrass Encyclopedia Article
Burcucumber Encyclopedia Article
Bull thistle Encyclopedia Article
Bush honeysuckle Encyclopedia Article
Canada thistle Encyclopedia Article
Carpetweed Encyclopedia Article
Common buckthorn Encyclopedia Article
Catchweed bedstraw Encyclopedia Article
Common chickweed Encyclopedia Article
Common burdock Encyclopedia Article
Common cocklebur Encyclopedia Article
Common dandelion Encyclopedia Article
Common lambsquarters Encyclopedia Article
Common mallow Encyclopedia Article
Common milkweed Encyclopedia Article
Common mullein Encyclopedia Article
Horsenettle Encyclopedia Article
Common ragweed Encyclopedia Article
Field horsetail Encyclopedia Article
Virginia creeper Encyclopedia Article
Prostrate knotweed Encyclopedia Article
Pennsylvania smartweed Encyclopedia Article
Wild buckwheat Encyclopedia Article
Buffalobur Encyclopedia Article
Prickly sida Encyclopedia Article
Fomesafen Carryover to Corn ICM News
Henbit Encyclopedia Article
May Maize Maladies Blog Post
Dicamba, monarchs, and milkweeds Blog Post
Downwind Buffers and Susceptible Crop Restrictions for New Dicamba Products ICM News
Dicamba: Past, Present, and Future Blog Post
A historical perspective on dicamba Blog Post
New Dicamba Labels Limit Application Timing ICM News
Fall Marestail (Horseweed) Management ICM News
Hours available to apply dicamba based on wind restrictions Blog Post
2017 Western Iowa Labor Day Palmer Amaranth Tour Blog Post
Add Osceola County to the Map – Increased Vigilance Needed ICM News
Factors influencing dicamba volatility Blog Post
2017 ISU State Fair Weed ID Contest Results Blog Post
Dicamba Off-target Injury Update ICM News
The State Fair Weed ID Contest is Approaching Blog Post
Thoughts on the Dicamba Dilemma Blog Post
Off-target Dicamba Injury: The Iowa Experience ICM News
A Weed Out of Place Blog Post
Weedy Amaranthus Quiz II Blog Post
Think you know your pigweeds? Blog Post
Palmer amaranth: ID, biology and management Encyclopedia Article
The Oak Tatters Conundrum ICM News
Still don’t think you need integrated weed management? Encyclopedia Article
Those who cannot remember the past... Encyclopedia Article
Perspectives on herbicide resistance Encyclopedia Article
Effectiveness of Using Multiple Sites of Action To Manage Resistance Encyclopedia Article
Group 4 (Growth regulator herbicides) Resistance in Weeds Encyclopedia Article
Is there such a thing as a Superweed? Encyclopedia Article
Why in the World is Enlist Corn Resistant to the Fop Herbicides? Encyclopedia Article
Biological control of musk thistle Blog Post
Are Roundup Ready weeds in your future? Encyclopedia Article
Glyphosate - A Review Encyclopedia Article
Point - Counterpoint Encyclopedia Article
Resolved isomers explained Encyclopedia Article
Absorption of Soil-Applied Herbicides Encyclopedia Article
Herbicide Residues in Soybean Following Drift Encyclopedia Article
Soybean response to sublethal doses of 2,4-D and dicamba Encyclopedia Article
Effect of residual herbicides on cover crop establishment Encyclopedia Article
Absorption of foliar-applied herbicides Encyclopedia Article
Role of spray adjuvants with postemergence herbicides Encyclopedia Article
Effect of carrier pH on Accent activity Encyclopedia Article
Effect of frost on pasture weed control Encyclopedia Article
Apply When Actively Growing? Encyclopedia Article
Two Applications are Better than One Encyclopedia Article
Weed emergence patterns Encyclopedia Article
Influence of preharvest herbicide applications on seed viability Encyclopedia Article
Spatial weed distribution: Can it be used to improve weed management Encyclopedia Article
Adaptation in Weeds - Dandelion Encyclopedia Article
Multiflora Rose and Rose Rosette Disease Encyclopedia Article
Seed production following mowing in a summer annual Encyclopedia Article
A brief history of Canada thistle in Iowa Encyclopedia Article
Biennial thistles of Iowa Encyclopedia Article
White thistles invade Iowa Encyclopedia Article
Equisetum: Biology and Management Encyclopedia Article
Fate of weed seeds in the soil Encyclopedia Article
Giant ragweed emergence patterns Encyclopedia Article
Will a cereal rye cover crop suppress your weeds? Encyclopedia Article
Can total postemerge programs provide optimal yield? Encyclopedia Article
Critical periods of competition in corn Encyclopedia Article
Why two if one will do? Encyclopedia Article
Influence of Corn on Waterhemp Growth Encyclopedia Article
Managing weeds to protect crop yields Encyclopedia Article
Non-competitive effects of weeds on corn Encyclopedia Article
Impact of Early-Season Weed Competition On Corn Nitrogen Needs Encyclopedia Article
Evaluating Herbicide Injury on Soybean ICM News
Preemergence Herbicide Options for Planted Soybean Fields ICM News
Is it time to scout CRP for Palmer amaranth? Blog Post
Milestone vs 2,4-D for Palmer amaranth control in CRP Blog Post
Update on Palmer Amaranth in Conservation Plantings ICM News
VIDEO: Managing Weeds, Insects and Diseases in Iowa Fields Blog Post
Impact of rye cover crops on preemergence herbicide activity Blog Post
Top 10 Strategies for Managing Herbicide Resistance Blog Post
The cost of herbicide resistance Blog Post
Everybody has the answer but me Blog Post
Those who cannot remember the past are condemned to repeat it Blog Post
Iowa House Bill 410: Adding Palmer to Noxious Weed Law Blog Post
Oh, when will they ever learn? Blog Post
Is 80% of Iowa waterhemp really resistant to Group 14 herbicides? Blog Post
Herbicide Resistance Management Session at Commodity Classic: Iowan's Experiences/Opinions Needed Blog Post
Scouting fields for Palmer amaranth in January Blog Post
Wind Speed and Herbicide Application ICM News
The Iowa Noxious Weed Law: If I were king Blog Post
Not all drift is created equal Blog Post
Deciphering the new 2,4-D and dicamba labels Blog Post
2017 Herbicide Guide available Blog Post
Who's laughing now? Blog Post
Increased Dicamba Use Requires Enhanced Stewardship ICM News
Is this ad Hall of Shame worthy? Blog Post
Palmer amaranth - And now the good news? Blog Post
Palmer amaranth - Put away the mowers Blog Post
Acalypha australis - A plant truly out of place Blog Post
Cover Crop Seed and Palmer Amaranth ICM News
White snakeroot - A toxic plant of Iowa Blog Post
Managing Palmer Amaranth in Conservation Plantings ICM News
Final Labor Day Palmer amaranth tour summary Blog Post
Palmer amaranth - A highly variable weed Blog Post
New Palmer amaranth identification bulletin available Blog Post
Palmer Amaranth in Iowa - What We Know ICM News
2016 State Fair Weed ID Contest Results Blog Post
Iowa Code 317.1 – Time for a Change* Blog Post
Another one bites the dust, or, City of Ames beats Japanese knotweed Blog Post
Palmer Amaranth on the Move ICM News
I been walkin' the beans Blog Post
Mowing requires management to be effective Blog Post
Are the 2016 wild parsnip infestations the new normal for Iowa? Blog Post
Pesticide labels: There are no substitutes Blog Post
On a weed and a prayer Blog Post
Fields (and roadsides) of gold Blog Post
Blue mustard - Another weed off the bucket list Blog Post
Post herbicides on frost injured corn Blog Post
The dreaded 'M' word - Mechanical weed control Blog Post
How do I get rid of Equisetum? Blog Post
Why all the winter annuals this year? Blog Post
Horseweed (marestail) management in no-till Blog Post
Cold Temperatures and Burndown Herbicides ICM News
Weed survival Blog Post
Mixed message Blog Post
Terminating Cover Crops - What's Your Plan? ICM News
Dicamba and Dicamba-Resistant Soybean Varieties ICM News
Palmer amaranth invades ISU Memorial Union Blog Post
Herbicide history Blog Post
Monarch overwintering numbers rebound Blog Post
Herbicide program development: Long-term planning Blog Post
Download available for herbicide options for grazing cover crops Blog Post
Herbicide program development: Herbicide rate calculations Blog Post
Selecting Nozzles for Postemergence Herbicides ICM News
Herbicide program development: Using effective herbicide groups Blog Post
Spray Volume is Critical for Postemergence Herbicides ICM News
Herbicide program development: Using multiple sites of action Blog Post
Breaking Down Resicore - Does It Pass the Test? ICM News
Waterhemp management: It's system more than trait! Blog Post
2016 Herbicide Guide for Iowa Corn and Soybean Production Now Available Blog Post
Herbicide options for grazing cover crops Blog Post
Diversifying Weed Management System for Profitable Crop Production Blog Post
White Snakeroot - Fun Weed Fact for the Week Blog Post
Keep eyes open for Palmer amaranth ICM News
The 2015 Western Iowa Palmer Amaranth Tour Blog Post
Size Matters Blog Post
The hidden cost of late-season waterhemp Blog Post
Bumper crop of weedy cucumbers Blog Post
Late-Season 2,4-D Treatments in Corn ICM News
Wild parsnip toxicity - Today's fun fact Blog Post
State Fair Weed ID Contest Blog Post
A Plethora of Poison Ivy? Blog Post
Choose adjuvants wisely Blog Post
Is that a Palmer amaranth or waterhemp? Blog Post
Teasel on the move Blog Post
Equisetum: From the Ditch to the Field ICM News
UAN and Herbicides on Emerged Corn ICM News
The Iowa Monarch Conservation Consortium ICM News
It's Palmer Time ICM News
Don't Miss the State Fair Weed ID Contest ICM News
Controlling Large Weeds - Do You Feel Lucky? ICM News
Fomesafen Carryover Injury to Corn ICM News
Palmer Amaranth is Up and Growing ICM News
Can You Afford to Skip the Residual? ICM News
Farmer Awareness of Herbicide-resistant Weeds ICM News
Cereal Rye Cover Crops, Allelopathy and Corn ICM News
Terminating Cover Crops ICM News
Palmer Amaranth in Iowa Update ICM News
Palmer Amaranth Update ICM News
Identifying waterhemp and Palmer amaranth ICM News
Palmer Amaranth Confirmed in Western Iowa ICM News
Keep an Eye Out for ‘Odd’ Pigweeds ICM News
Is it Palmer Amaranth? ICM News
UAN and Herbicides on Emerged Corn ICM News
Don’t Delay the Burndown Application ICM News
Troublesome Palmer Amaranth Expanding Its Range ICM News
A History Lesson in Herbicide Resistance ICM News
Herbicide Resistance Meetings Return ICM News
Carryover Concerns for 2013 ICM News
It's a No-win Situation: Large Weeds and Hot, Dry Weather ICM News
How much can volunteer corn affect corn yields? ICM News
Emerged Corn, Herbicides and Nitrogen ICM News
'Early' Early-spring Weed Management ICM News
Herbicide Resistance Meetings ICM News
Managing Glyphosate Failures ICM News
Spring Control of Multiflora Rose ICM News
Use Facts to Make Glyphosate and Glyphosate Resistant Crop Decisions ICM News
Waterhemp Wins Again ICM News
Spread of Glyphosate Resistant Weeds ICM News
New Information on Herbicide Labels ICM News
How Much Yield Have You Lost? ICM News
Timing Restrictions for Postemergence Herbicides in Corn ICM News
Postemergence Herbicides on Frost-Damaged Corn ICM News
Weed Control in Weather-Stressed Corn ICM News
Protect Your Corn Yields from Weeds ICM News
Do CRP Acres Converted to Soybean Require Inoculation? ICM News
It's Time to Scout for Winter Annuals ICM News
Glyphosate and Manganese Interactions in Roundup Ready Soybean ICM News
Late-Season Herbicide Applications in Soybean ICM News
Corn Response to Postemergence Treatments ICM News
Size Restrictions for Postemergence Herbicides in Corn ICM News
Early-Season Weed Competition ICM News
Volunteer Corn Management ICM News
Planting Restrictions Following 2,4-D Applications ICM News
Managing Poison Hemlock in No-till ICM News
Managing Winter Annual Weeds in No-Till Fields ICM News
Improving glyphosate performance in Roundup Ready soybean ICM News
Dealing with Late Weed Escapes in Corn ICM News
Corn Size Restriction for POST Herbicides ICM News
Timeliness Critical to Protect Corn Yields ICM News
Managing 2,4-D for No-Till Burndown Treatments ICM News
Delayed Burndown Applications in No-Till ICM News
Starting Clean in No-till ICM News
Pesticide Drift Reduction Starts Now ICM News
Now's the time to control biennial weeds Encyclopedia Article
Importance of timely scouting for weeds Encyclopedia Article
The importance of an even start Encyclopedia Article
Status and concerns for glyphosate resistance Encyclopedia Article
Weed management in a dry spring Encyclopedia Article
Critical periods of competition in corn Encyclopedia Article
Effect of the crop canopy on spray coverage Encyclopedia Article
Choosing cultivation for dry soils Encyclopedia Article
Early-season weed competition Encyclopedia Article