Leopold Center for Sustainable Agriculture

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Pheromone mating disruption: novel, non-toxic control of the European corn borer

1999 , Baker, Thomas , Rice, Marlin , Leopold Center for Sustainable Agriculture

The European corn borer is one of the most damaging insects in Iowa cornfields, causing more than $100 million in crop losses each year. In this project, the sex attractant pheromone of the European corn borer was used to obstruct the ability of the adult male moths to locate females for mating. In the first year, efforts focused on mating disruption in a small area, while in the second year dispensers were deployed on a larger scale and evaluated for efficacy.

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Biocontrol of Sclerotinia stem rot in soybeans with Sporidesmium sclerotivorum

1999 , Martinson, Charlie , Yang, Xiao-Bing , Leopold Center for Sustainable Agriculture

Sclerotinia stem rot of soybeans (also known as white mold) is caused by a soil-borne fungus and has become a serious problem in northern Iowa. Another fungus, Sporidesmium sclerotivorum, acts as a parasite of the sclerotia and this research tested whether this mycoparasite could act as an effective deterrent to the soybean stem rot pathogen.

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Characterization of the Rose Rosette Disease causal agent: potential for biological control and multiflora rose

1999 , Epstein, Abraham , Hill, John , Leopold Center for Sustainable Agriculture

Rosa multiflora (multiflora rose), introduced to America from Japan for ornamental pur­poses 200 years ago, was promoted in Iowa during the mid-1930s as a "living fence" that would help to conserve soil and provide cover for wildlife. Multiflora rose has since natural­ized, and today some two million acres of Iowa land are infested with this pest, which renders pastures unusable (dense stands exist in coun­ ties south of a line from West Pottawattamie through Winneshiek, affecting the southeast­ern two-thirds of the state). Cattle avoid the prickly stems, and grass dies beneath its thick growth. Although tillage can control the weed, land in permanent pasture or under the Conser­vation Reserve Program is at risk for the spread of multiflora rose.

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Integrated pest management for wireworms

1999 , Pedigo, Larry , Rice, Marlin , Batchelor, William , Leopold Center for Sustainable Agriculture

With Iowa farmers returning land from the Conservation Reserve Program and pasture use to crop production, there is a need to deal with potential wireworm infestations. Researchers sought to develop an early warning system for locations "at risk" from wireworms, using Geographical Information Systems technology. User-friendly wireworm diagnostics for farmers were researched, along with low-risk cropping alternatives to planting insecticide-protected corn. Integrated Pest Management (IPM) recommendations were generated that, if implemented, will reduce unnecessary insecticide use in Iowa.

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Identification and characterization of the Rose Rosette disease causal agent

1999 , Hill, John , Epstein, Abraham , Leopold Center for Sustainable Agriculture

Rose rosette disease is lethal to multiflora rose, a noxious weed occurring in pastureland in most of Iowa. The potential use of rose rosette disease as a biocontrol agent can be enhanced by grafting infected shoots onto plants in established stands (i.e., augmentation). However, questions arose about whether the disease could be spread to ornamental roses. This study probes the identity of the causal agent for the disease in hopes of determining whether fears of transmission to ornamental roses were valid.