Authored by Bob Hartzler

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