Trees are one of the most valuable assets in a landscape. All properties enjoy the benefits of having healthy and beautiful trees. In addition to the aesthetic appeal, a healthy tree can add value to a property. Home gardeners with questions about the management of other tree diseases may contact the experts by emailing or calling the ISU Extension horticulture hotline at or 515-294-3108.

My crabapple has begun to drop some of its leaves. Why?
The leaf drop is probably due to apple scab. Apple scab is a fungal disease caused by the fungus Venturia inaequalis.Cool, wet weather in spring favors apple scab development. Crabapple varieties differ in their susceptibility to apple scab. Some varieties are very susceptible to the disease, while others are resistant to apple scab.

Apple scab appears as velvety, olive-green to black spots on the crabapple leaves. Heavily infected leaves turn yellow and fall from the tree. Highly susceptible crabapple varieties may lose a large percentage of their leaves by mid-summer. Fortunately, apple scab does not kill affected trees. The damage is mainly aesthetic.

Apple scab can be prevented by applying fungicides from bud break through mid-June. For most home gardeners, however, controlling apple scab with fungicides is not practical. Sanitation also plays a role in controlling apple scab. Raking and destroying the leaves as soon as they fall should help reduce the severity of the infection next season. However, the best way to prevent apple scab is to plant scab-resistant crabapple varieties.

Why are the leaves on my pin oak yellow-green?
In Iowa, the foliage of the pin oak (Quercus palustris) often turns a sickly yellow-green. The yellow-green foliage isdue to a deficiency of iron. The problem is referred to as iron chlorosis. (A close examination of chlorotic leaves will show that while most of the leaf is yellow-green, the tissue around the major veins is a darker green.) Most soils in Iowa contain sufficient amounts of iron. However, in alkaline soils (those with a pH above 7.0), the pin oak is unable to absorb adequate amounts of iron because much of it is in an insoluble form. Since many soils in Iowa are alkaline, chlorotic pinoaks are common in Iowa. Wet soil conditions make absorption of iron even more difficult.

Correcting an iron chlorosis problem is difficult. Applying additional iron to the soil usually doesn't help. The soil already contains sufficient amounts of iron. Adding more iron doesn't overcome the problem. Lowering the soil pH to 6.0 to 6.5 would allow the roots of the pin oak to more readily absorb iron in the soil. Unfortunately, lowering the soil pH isextremely difficult, if not impossible. As a result, homeowner efforts to treat iron chlorosis are often unsuccessful.

One strategy that sometimes works is to have an arborist or other tree care professional inject an iron containing compound directly into the trunks of chlorotic pin oak trees. The effects of a trunk injection may last three or four years.

Why is my sycamore tree dropping its leaves?
The leaf drop is likely due to anthracnose. Anthracnose is a common fungal disease of sycamore, ash, maple, oak and other trees. Anthracnose is most severe in years with cool, wet spring weather. While anthracnose may cause extensive defoliation, it does not cause serious harm to healthy, well-established trees.

Symptoms of anthracnose on sycamores include brown blotches on the leaves, death of young buds and shoots, and leaf drop. In cool, wet springs, affected sycamores may lose most of their initial foliage.

Fortunately, the sycamore trees will continue to produce additional leaves and shoots through early summer. Foliage that develops in late spring and early summer shouldn't become infected as warmer, drier weather suppresses anthracnose. Most sycamores should have a good canopy of leaves by late June or early July. 

Since anthracnose does not cause serious harm to sycamores, fungicide treatments are rarely warranted.

The leaves on my peach tree are puckered and reddish in color. What is the problem?
The symptoms are those of peach leaf curl. Peach leaf curl is a fungal disease. The disease is caused by the fungusTaphrina deformans. Infections occur as the peach tree buds begin to swell in spring.

A single fungicide application will control peach leaf curl. Fungicides, such as lime sulfur, Bordeaux mixture or chlorothalonil, should be applied in fall after leaf drop or in late March before the buds begin to swell. To achieve control, all branches and twigs must be thoroughly sprayed.


AMES, Iowa – Iowa Learning Farms (ILF) and the Iowa Department of Agriculture and Land Stewardship (IDALS) are hosting a bus tour of Conservation Reserve Enhancement Program (CREP) wetlands in Kossuth County on Tuesday, June 28, from 1:30-3:30 p.m.

Registered attendees can park and meet the motor coach at the Kossuth County Fairgrounds in Algona, where the bus will depart from and return to at the end of the tour. The tour is free and is limited to 40 pre-registered participants. To register, call 515-294-5429, or The fairgrounds are located on the south side of Algona on Highway 169.

The tour will include stops at two completed CREP wetland sites east of Algona. Tour participants are encouraged to bring their hiking boots or waders for an up-close look at these structures. Matt Lechtenberg and Shawn Richmond, CREP specialists with IDALS, Iowa State University Extension water quality engineer Matt Helmers and farmer-landowners who have installed CREP wetlands will lead the tour and talk about the benefits, installation and financial incentives for these structures.

Thirty-seven counties in north-central Iowa are eligible for enrollment in CREP. Research at Iowa State University has demonstrated that strategically sited and designed wetlands can remove 40-90 percent of nitrates and more than 70 percent of herbicides from cropland drainage waters. These areas are as beautiful as they are functional.

Iowa Learning Farms is building a Culture of Conservation, encouraging adoption of residue management and conservation practices. Farmers, researchers and ILF staff are working together to encourage farmers to implement the best in-field management practices that increase water and soil quality while remaining profitable.

Iowa Learning Farms is a partnership between the Iowa Department of Agriculture and Land Stewardship, Iowa State University Extension, Leopold Center for Sustainable Agriculture, Iowa Natural Resources Conservation Service, and Iowa Department of Natural Resources and the USEPA (section 319); in cooperation with Conservation Districts of Iowa and the Iowa Farm Bureau.

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AMES, Iowa -- Some people see cooperatives as the way electricity gets to their rural home, or how local crops get from grain bins to the market, or the way to buy fresh, locally grown foods. Some people call cooperatives a business model,but college students and graduates who have had experiences with cooperatives see them as a way to gain valuable work experiences, scholarships and the means to addressing community needs.

Members benefit
Mingwei Huang, Director of Education and Training at North American Students of Cooperation (NASCO), lived in a housing co-op as a student at the University of Wisconsin-Madison. The housing co-op was not only a beneficial living situation, it was also an educational experience.

"My co-op was in the heart of campus, but was not entirely a student co-op," Huang said. "In fact, it was about half student and half community and workers. This was very grounding for me since it's easy for students to live in a bubble. I learned a lot and developed many great relationships while living with so many great, interesting people."
In fact, skills like basic budgeting, communication, handling conflict, minor maintenance and accountability were skills she learned while living in the housing co-op that remain valuable to her today.

Member ownership and control
A housing co-op is significantly different from an apartment building, rental house or sorority or fraternity. As a member-owner, each resident contributes to the house labor and has a say in how it's run and managed. Huang used her time in a housing co-op to become involved on its board as vice president and in member education. These responsibilities gave her leadership experience, in addition to teaching her about collaboration, democracy and accountability.

"In our society, we are taught to think and act independently or in our own interests," she said. "We tend to organize our relations with others as sole independent people rather than interdependent groups and networks."

The ability for any cooperative to succeed depends on a collective effort, which Huang says is accomplished through healthy communication and navigation of power dynamics. These skills can carry over into the personal and professional realms.

Huang's experience with her housing co-op demonstrate three principles that are widely recognized and practiced by cooperatives: member benefits, member ownership and member control. According to, an educational partnership of 74 land-grant universities, these principles distinguish a cooperative from other kinds of businesses. The member-benefits principle is carried out when members unite to produce services otherwise not available, gain access to markets, or other mutually beneficial reasons. The member-owner principle is simple; members own the cooperative and have the financial and operational obligations and rewards of an owner. The member-control principle is exercised when members vote at membership meetings and serve on the board of directors.

Jesse Martin applies cooperative principles to the daily operations of Martin's Native Lumber of Dayton, Va., even though the business is a private, fourth-generation, family-owned business.

Communicating through one-on-one employee meetings and offering profit-sharing retirement portfolios are two practices Martin applies that reflect the cooperative business model.

"Cooperative education has allowed me to consider the world of business with a far more open mind," Martinsaid. "Often, I approach items in my own business with principles learned through the co-op education programs. I have found that if we think of our customers as owners and having a vested interest in our company, that we provide higher quality service."

Martin became involved with cooperatives after attending a conference during college and later becoming selected as the National Institute of Cooperative Education's chairman. The National Institute on Cooperative Education (NICE) is a youth scholar program that provides educational and social activities. The goals of the institute include increasing the understanding of basic cooperative principles, the challenges faced by cooperatives and the opportunities provided by cooperatives.

Expanding cooperative education
A leadership team made up of university faculty and researchers has created the eXtension Cooperative Community of Practice to increase the visibility of the cooperative business model with information they contribute to the website.

Leah Henkes, an Iowa State University senior in dairy science, contributed to the development of the cooperatives one Xtension website during her initial involvement with cooperatives.

"I think it is extremely beneficial for young people to learn about the cooperative business model because it gives them the chance to help network their abilities and resources," Henkes said. "By working with others to accomplish a goal it is easier to reach that goal."

Three Iowa State University students from Ron Deiter's Cooperatives class had the opportunity to attend the 2011 College Conference on Cooperatives (CCOC), a three-day program offered by the National Farmers Union (NFU) and the cooperative community of the upper Midwest on Feb. 19-21. The conference helps college students gain a more thorough understanding of cooperatives and the career opportunities available. It exposes attendees to the many areas of the economy stimulated by cooperatives - beyond agriculture.

Students wanting to be more engaged with local cooperatives, thinking of starting a cooperative, or wanting a better understanding of the responsibilities of a board member, can explore the resources available at the eXtension Cooperatives Community of Practice website. Leadership programs, local job opportunities, scholarships and careers offered by cooperatives are featured on the site.


June 28
Scott County Extension Council Meeting at the Extension Office

July 1
Pesticide Applicator Testing
10am-2pm at the Extension Office

July 26
Scott County Extension Council Meeting at the Extension Office

August 5
Pesticide Applicator Testing
10am-2pm at the Extension Office

August 23
Scott County Extension Council Meeting at the Extension Office

September 2
Pesticide Applicator Testing
10am-2pm at the Extension Office

September 27
Scott County Extension Council Meeting at the Extension Office

October 5
Aquatic, Forest and Roadside Pest Management CIC, $35 if registered by 9/28/11, after that $45
At the Scott County Extension Office, 9am-11:30am

October 7
Pesticide Applicator Testing10am-2pm at the Extension Office

October 25
Scott County Extension Council Meeting at the Extension Office

October 27
Mosquito & Public Health Pest Management CIC, $35 if registered by 10/20/11, after that $45
At the Scott County Extension Office, 9am-11:30am

November 4
Pesticide Applicator Testing
10am-2pm at the Extension Office

November 9
Ornamental & Turf Applicators CIC, $35 if registered by 11/2/11, after that $45
At the Scott County Extension Office, 1:30pm-4pm

November 16
Commercial Ag Weed, Insect, and Plant Disease Management CIC, $35 if registered by 11/9/11, after that
$45, at the Scott County Extension Office, 9am-11:30am

November 29
Fumigation CIC, $35 if registered by 11/22/11, after that $45, at the Scott County Extension Office,

December 2
Pesticide Applicator Testing
10am-2pm at the Extension Office

December 7
Pest Control Operators CIC, $35 if registered by 11/30/11, after that $45, at the Scott County Extension
Office, 9am-11:30am

Visit our events calendar at our web site:

WASHINGTON - Senator Chuck Grassley today made a request to the leadership of the Senate Agriculture Committee that Iowa host a field hearing to discuss the next farm bill.

In his letter to Senate Agriculture Committee Chairwoman Debbie Stabenow and Ranking Member Pat Roberts, Grassley said that Iowa is one of the leading states in producing a number of agricultural products and that the state lies in the heart of the farm belt.  Iowa is the number one producer of corn, soybeans, pork, and eggs.

"Iowa agriculture is crucial to the health of the economy of the state, and supports thousands of non-farm jobs around the state," Grassley said.  "In addition, the committee has a history of conducting field hearings in Iowa as it considers farm bill legislation."

Here is a copy of the text of the letter.

Tuesday, June 21, 2011

The Honorable Debbie Stabenow
Chairwoman, Committee on Agriculture 
Nutrition and Forestry
Russell Senate Office Building 328A
Washington, D.C. 205 10-6000

The Honorable Pat Roberts
Ranking Member, Committee on Agriculture
Nutrition and Forestry
Russell Senate Office Building 328A
Washington, D.C. 20510-6000

Dear Chairwoman Stabenow and Ranking Member Roberts:

I appreciate your leadership in moving the committee forward in considering the upcoming farm bill. The hearings held so far have provided very insightful information, and I am looking forward to upcoming discussions.

As you consider future committee hearings, I urge you to conduct a field hearing in my home state of Iowa.  Iowa is one of the leading states in producing a number of agricultural products.  It lies in the heart of the farm belt and is home to some of the most innovative and dynamic agriculture businesses in the world. In addition, there are countless examples throughout the state which highlight the tremendous work accomplished through rural development programs. Consequently, the committee has a history of conducting field hearings in Iowa as it considers farm bill legislation.

The policies set in the next farm bill have a tremendous impact on not only farmers, but all Iowans, as there are thousands of non-farm jobs supported by agriculture. Conducting a field hearing in Iowa will give the committee a tremendous opportunity to hear from farmers, rural Americans, companies leading the way in agriculture innovation, and other citizens impacted by farm bill programs.

You have recently received a letter from Iowa Governor Terry Branstad and Iowa Secretary of Agriculture Bill Northey extending an invitation for the committee to have a hearing in Iowa, and they have graciously offered to assist in hosting the hearing. I join them in inviting you to schedule a hearing in Iowa, and I urge you to take them up on their offer to assist in hosting the hearing.

If you would like to discuss this matter further, please let me know, or get in touch with my staff.


Charles E. Grassley
United States Senator



Data Portal Increases Access to Information;
Establishes Platform for Creative Uses

CHICAGO - June 21, 2011. Governor Pat Quinn today announced the launch of a state website designed to provide open access to state data and greater transparency in state government. The platform is the second initiative of the Governor's Illinois Innovation Council.

The State of Illinois Open Data site, www.Data.Illinois.Gov, is a searchable clearinghouse of information from state agencies that will help inform residents about the operation of state government and encourage the creative use of state information, including the development of applications for mobile devices that can be built around the data.

"The Open Data initiative opens the doors of state government to everyday citizens and technology professionals alike in creating an unprecedented level of transparency and access to information. This is a creative new opportunity to use state data in novel and interesting ways that engage residents, plugging them into their state government like never before," Governor Quinn said. "It will also help spur economic development by encouraging software developers to create innovative and useful applications for this data."

The data site is an initiative of the Illinois Innovation Council, created by Governor Quinn in February, to promote economic development through innovation and the engagement of citizens, developers, academia and industry. The council promotes the role and importance of innovation in economic development and quality of life. For more information, please visit

"The Illinois Innovation Council is working to connect the dots between research, talent, capital, ideas, government and technology to accelerate the growth of businesses and industries in the Midwest. Today, we start to add the troves of public data to the mix. This underutilized asset holds untapped potential to fuel the growth of Illinois' innovation economy," said Lightbank Managing Partner, and Groupon Co-Founder and Director Brad Keywell.

The first phase of the site was launched with data from the Illinois Department of Transportation, the Illinois Department of Commerce and Economic Opportunity, the Illinois Department of Revenue and the Illinois Environmental Protection Agency. Residents who explore the site will find a host of helpful information, such as traffic data from IDOT or tourism data from DCEO. The site will continue to grow with data as more state agencies are added, with the goal of being a comprehensive source of information on how state government operates.

The council held its second meeting this week and will hold two additional meetings in the coming year. The Illinois Science and Technology Coalition, an independent, not-for-profit organization, is also assisting the council.


GRINNELL, Iowa (Grassroots Newswire) June 21, 2011 - Kelsey E.  Roebuck has been named to the Grinnell College Dean's List for the spring semester 2011. Roebuck, who is an undeclared major, is one of approximately 260 students honored for outstanding academic achievement by Grinnell College. To make the Dean's List, students must have a grade point average of 3.75 or above.

Roebuck is the child of Mr. Glenwood W. Roebuck and Ms. Diane B. Roebuck of Davenport (52803).

Grinnell College is a nationally recognized, private, four-year, liberal arts college located in Grinnell, Iowa. Founded in 1846, Grinnell enrolls 1,600 students from all 50 states and from as many international countries in more than 26 major fields, interdisciplinary concentrations, and pre-professional programs.

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ROMEOVILLE, Ill. (Grassroots Newswire) June 21, 2011 - 

Andrea Iossi of Davenport was among those honored on the Lewis University Deans' List for spring semester 2011. To be eligible for this honor, students must have completed a minimum of 12 semester hours of credit with a grade point average of 3.25 out of a possible 4.0.

Lewis University is a Catholic university offering distinctive undergraduate and graduate programs to more than 6,000 traditional and adult students. Lewis offers multiple campus locations, online degree programs, and a variety of formats that provide accessibility and convenience to a growing student population. Sponsored by the De La Salle Christian Brothers, Lewis prepares ethically grounded, globally aware, and socially responsible graduates. The ninth largest not-for-profit university in Illinois, Lewis has been nationally recognized by The Princeton Review and U.S. News & World Report. 

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WASHINGTON - Senator Chuck Grassley of Iowa and Senator Herb Kohl of Wisconsin today released a report showing the need for the Food and Drug Administration (FDA) to enhance its assessment of recalls of medical devices to better mitigate the risk of serious health consequences from defective or unsafe devices.

"The gist of this report is that the FDA can't tell if recalls of high-risk devices were carried out successfully because it lacks criteria for assessing device recalls and doesn't routinely review recall data," Grassley said.  "Recalls are typically voluntary, and patients would be better served if the FDA took a thorough approach to post-market surveillance of medical devices.  Right now, it looks like the FDA is missing an opportunity to proactively identify and address risks presented by unsafe devices.  Doing so would establish greater accountability for patients."

"Unfortunately, weaknesses in FDA's post-marketing surveillance of medical devices identified at a recent Committee on Aging hearing and again here by the GAO demonstrate the clear need to strengthen the post-market monitoring and recall process," Kohl said.

Grassley and Kohl requested this report of the Government Accountability Office (GAO).  It's titled MEDICAL DEVICES:  FDA Should Enhance Its Oversight of Recalls, GAO-11-468.

Grassley routinely conducts oversight of the Food and Drug Administration.  Kohl recently conducted a hearing of the Special Committee on Aging, where he serves as Chairman, about the agency's approval process for medical devices.

The GAO said that, in 2007, medical devices were involved in 45 million inpatient procedures, 117 million hospital emergency room visits, 89 million hospital outpatient visits, and 994 million physician office visits.  Medical devices range from tongue depressors to pacemakers and artificial heart valves.


Reaffirms Commitment to Doubling State's Exports by 2015;

Presents 2011 Illinois Export Awards

CHICAGO - June 21, 2011. Governor Pat Quinn today reaffirmed his commitment to doubling Illinois' exports by 2015 during an address to kick off Illinois Export Week, a five-day event that helps Illinois businesses expand into the global marketplace. The Governor also presented the 2011 Illinois Export Awards.

"More than half a million Illinois jobs are supported by exports, but we cannot stop now. Our state's continued economic vitality depends on our ability to build key global partnerships," said Governor Quinn. "To continue to grow and lead in the 21st century, we must continue to take every step necessary to increase our exports, ultimately doubling them by 2015."

Expanding global trade partnerships is critical to Illinois' continued economic recovery. Illinois ranks first in the Midwest for exports and foreign direct investment. The state's exports totaled nearly $49.8 billion in 2010, a 19.6 percent increase over 2009. In the first quarter of 2011, Illinois exported more than $14.74 billion worth of non-agriculture goods - an increase of 30.43 percent compared to the same period in 2010.

Illinois Export Week, which runs June 20-24, features a series of seminars designed to help educate business owners on export opportunities. The Illinois Export Awards recognize companies that have achieved excellence in exporting and organizations that have provided substantial export assistance to Illinois companies. Governor Quinn presented 17 companies and organizations with awards at a luncheon on Tuesday. A list of 2011 Illinois Export Award winners is attached.

Illinois Export Week events feature top leaders from Illinois's export business community. Caterpillar Inc. Chairman and Chief Executive Officer Doug Oberhelman was the keynote speaker.

"Last year Caterpillar exported more than $13.4 billion in products from the United States?more than a third of that is from Illinois ? two figures that would have no doubt been higher had the U.S. fully embraced trade liberalization," Oberhelman said. "Simply put, many of our 47,000 employees in the U.S. and 23,000 employees in Illinois depend on trade."

The Illinois Department of Commerce and Economic Opportunity is partnering with local Small Business Development Centers this week to provide businesses with insight into export opportunities around the world. Information is available at