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Iowa: Is Palmer Pigweed Spread in a ‘Lag Phase’?

Iowa: Is Palmer Pigweed Spread in a ‘Lag Phase’?

👤By Bob Hartzler, Iowa State University 🕔Jun 23, 2017

The introduction and spread of Palmer amaranth in Iowa undoubtedly will have a significant impact on crop production and weed management in the future.  However, since the first infestations were identified I’ve been intrigued by what seemed odd behavior for

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Iowa Soybeans: Thistle Caterpillars Showing Up

Iowa Soybeans: Thistle Caterpillars Showing Up

👤By Erin Hodgson, Iowa State University 🕔Jun 21, 2017

Today while scouting a commercial field north of Ames, I was looking for soybean aphid. I didn’t see one aphid (sniff, sniff), but I did see a handful of thistle caterpillars. The caterpillars web together soybean leaves and feed inside

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Iowa: Weed Quiz – Can You ID These 6 Different Pigweeds?

Iowa: Weed Quiz – Can You ID These 6 Different Pigweeds?

👤By Bob Hartzler, Iowa State University 🕔Jun 21, 2017

The six weedy Amaranthus species at the weed garden have grown quite a bit, but I’m not sure how much easier it is to differentiate a few of the species. Can you tell which is which?

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Iowa Field Reports: Crops Mostly Look Good, Some Hail Damage

Iowa Field Reports: Crops Mostly Look Good, Some Hail Damage

👤By Rebecca Vittetoe, Iowa State University 🕔Jun 21, 2017

Some much needed rain fell across parts of the state last week, but with the rain came some strong winds and hail in parts of the state. Other areas could still use some rain. Iowa State University Extension and Outreach field

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Iowa Corn, Soybeans: Hail Damage – To Keep the Stand or Make Other Plans

Iowa Corn, Soybeans: Hail Damage – To Keep the Stand or Make Other Plans

👤By Mark Licht, Iowa State University 🕔Jun 20, 2017

Unfortunately, hail damage is not a rare occurrence in Iowa. Every year hail damage occurs; it is just a matter of how severe it is and how widespread it is. In most cases, hail damage results in varied levels of

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Iowa: Plan to Attend Nitrogen and Water Week June 27-29

Iowa: Plan to Attend Nitrogen and Water Week June 27-29

👤By Paul Kassel, Iowa State University 🕔Jun 20, 2017

Consider attending one of the Nitrogen and Water Week field days next week – June 27 to 29. Our focus of these meetings is to have attendees ‘kick the tires’ on the tile drainage studies conducted by Iowa State University.

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Iowa Corn: How Fast and Deep Do Roots Grow?

Iowa Corn: How Fast and Deep Do Roots Grow?

👤By Mark Licht, Iowa State University 🕔Jun 16, 2017

Corn roots grow rapidly starting at the 4th-leaf stage and continue throughout vegetative development. This typically occurs from June to early July. Several factors affect root growth, but temperature and soil moisture are the most relevant factors in the absence of soil constraints.

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Iowa Corn, Soybeans: Japanese Beetles Emerging in Southern Areas

Iowa Corn, Soybeans: Japanese Beetles Emerging in Southern Areas

👤By Erin Hodgson, Iowa State University 🕔Jun 14, 2017

Japanese beetle is an invasive insect capable of feeding on corn and soybean. This pest has been in Iowa since 1994 but its distribution in field crops is sporadic around the state. Statewide populations have been low since 2014 and

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Iowa: Corn Rootworm Egg Hatch Peaking Around the State

Iowa: Corn Rootworm Egg Hatch Peaking Around the State

👤By Erin Hodgson, Iowa State University 🕔Jun 13, 2017

Corn rootworm egg hatch in Iowa typically occurs from late May to the middle of June, with an average peak hatching date of June 6 in central Iowa. In 2017, the average hatching date will be about the same time

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Iowa Soybeans: Evaluating Early Season Herbicide Injury

Iowa Soybeans: Evaluating Early Season Herbicide Injury

👤By Bob Hartzler, Iowa State University 🕔May 26, 2017

The potential for herbicide injury with preemergence herbicides is greater with soybean than corn. The risk increases with environmental conditions that reduce crop vigor and growth rate, and also with heavy rain that moves the herbicide to the depth of the

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