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Plant Pathology

Integrated Crop Management News

Weed Science

Articles 1 - 7 of 7

Full-Text Articles in Life Sciences

Warm Fall Temperatures, Scn And Winter Annual Weeds, Gregory L. Tylka Oct 2010

Warm Fall Temperatures, Scn And Winter Annual Weeds, Gregory L. Tylka

Integrated Crop Management News

We have had a wonderfully sunny, warm, dry fall so far this year. How could anyone complain about the weather? Leave it to a nematologist. Yesterday's ICM News article reminded growers and agronomists to delay application of anhydrous ammonia fertilizer until soil temperatures drop below 50F. It turns out that 50F is also an important temperature to consider for soybean cyst nematode (SCN).


Can Tank Mixing Fungicide With Post-Emergence Herbicide Increase Yield?, Alison E. Robertson May 2010

Can Tank Mixing Fungicide With Post-Emergence Herbicide Increase Yield?, Alison E. Robertson

Integrated Crop Management News

The early application of foliar fungicides to corn (V4-V7) is currently being encouraged by chemical companies across the corn belt. The idea is to tank-mix the fungicide with the post-emergence herbicide application and save on application costs. Furthermore, for additional cost savings, half or lower rates of fungicides are being marketed. It is my understanding that this early application of fungicide will not necessarily replace the VT/R1 application of foliar fungicide, rather it is an addition to the tassel/silking application.


Degree Days - More Heat And Humidity With Bigger Weeds, Richard O. Pope Jun 2009

Degree Days - More Heat And Humidity With Bigger Weeds, Richard O. Pope

Integrated Crop Management News

Summer burst through the doors with a blast of heat and humidity. Although oppressive to people, it allowed for rapid growth of both crops and weeds. Weeds are a considerable concern in most areas, most notably where pre-plant burn downs were skipped, and where spraying has been prevented by wet fields. Most areas of Iowa gained 20 to 25 degree days more than the average mid-June week.


Questions Concerning Section 18 Fungicides, Daren S. Mueller Apr 2006

Questions Concerning Section 18 Fungicides, Daren S. Mueller

Integrated Crop Management News

During the winter, Iowa State University Extension staff and the Iowa Department of Agriculture and Land Stewardship (IDALS) Pesticide Bureau staff fielded questions about Section 18 (emergency exemption) fungicides to decide whether Iowans can legally spray them for management of Asian soybean rust (ASR). In 2005, the Iowa Soybean Rust Team formulated the "I-70 Rule." They recommended that Section 18 fungicides not be sprayed unless Asian soybean rust was found north of I-70 in Missouri.


Callisto Injury To Corn, Micheal D. Owen Jun 2002

Callisto Injury To Corn, Micheal D. Owen

Integrated Crop Management News

Weed management faculty and staff at Iowa State University have received several calls concerning Callisto injury to corn. Many field visits have been made, and numerous samples have been assessed. Some of the situations involved insecticides applied previously to corn, some involved tank mix combinations with other herbicides (e.g., Steadfast), and some involved preemergence-applied herbicides (e.g., Balance) followed by a postemergence application of Callisto. In addition, numerous calls about injury from other herbicides have been received.


Sds On Roundup Ready Soybean, X. B. Yang Mar 2001

Sds On Roundup Ready Soybean, X. B. Yang

Integrated Crop Management News

I have been receiving questions about sudden death syndrome (SDS) on Roundup Ready soybean because some press reports based on a study by Missouri researchers have implicated the possibility of occurrence of SDS after Roundup (glyphosate) application. The preliminary results of the Missouri study were presented as a poster at a meeting. The study indicated that Roundup Ready (RR) soybeans receiving glyphosate at recommended rates had significantly higher incidence of Fusarium fungi on roots 1 week after application compared with soybean that did not receive glyphosate.


Herbicide-Tolerant Crops And Plant Diseases, Soum Sanogo, X. B. Yang Jan 1998

Herbicide-Tolerant Crops And Plant Diseases, Soum Sanogo, X. B. Yang

Integrated Crop Management News

Crop management is a dynamic activity that changes as technologies are developed. During winter extension activities, there were some discussions on soybean diseases observed on Roundup-Ready soybeans. This article takes a proactive approach to address some concerns that were commonly raised about herbicide-tolerant crops, herbicides, and the occurrence of plant diseases.