Liz Maynard

Clinical Engagement Assistant Professor of Horticulture
Department of Horticulture and Landscape Architecture
Liz Maynard's website

69 articles by this author

Article List

Many pesticides for use on vegetables have varying rules for use in different states. This article will review the different classes of labels for pesticides and where to find labels online. The shorthand names for classes of labels come from the section of the Federal Insecticide, Fungicide, and Rodenticide Act that governs each class. National labels are called Section 3 labels. These labels are approved by EPA for uses throughout the country. The Master Label on file with the EPA includes all registered uses. The label on a marketed product often contains only a subset of those uses. Even with federal approval of a Section 3 label, in order to be sold and used in Indiana, the product must also be registered with the Office of the Indiana State Chemist. To find products that are registered in Indiana, visit the NPIRS public web site. http://npirspublic.ceris.purdue.edu/state/state_menu.aspx?state=IN. Search by product name, EPA[Read More…]


The USDA lab out of Wooster, Ohio is interested in surveying Indiana sweet corn for virus. They are especially interested in sweet corn near johnsongrass, but other fields are ok too. If you are interested, please let me know or contact Mark Jones, USDA Agronomist,mark.jones@ars.usda.gov, (330) 202-3555 ext. 2837. Your participation would be pretty simple: one time when the corn is 15 to 30 inches tall you would collect ten leaf samples on a field transect and also a sample of any odd looking plants and mail them to the USDA lab for analysis. USDA would mail you a packet with sample bags and instructions and mailing materials. If you are interested, but would rather have someone else collect the samples, I can check with a local county Extension educator to see if they would be interested in collecting the samples. Thanks for considering this!


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Reports of vegetable trials from 2017 are published online in the Midwest Vegetable Trial Report for 2017.   There are reports of variety trials for green beans, cantaloupe/muskmelon, slicing and pickling cucumbers, ornamental corn, bell peppers in field and high tunnels russet potatoes, pumpkins, spinach in high tunnel, butternut squash in stripped-till rye, sweet corn, fresh market and saladette tomatoes, tomatoes in high tunnels, and watermelon. The trials were conducted in Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, and West Virginia. This and previous reports in the series are a good source of information on relative performance of vegetable varieties.      


Slides from presentations at the 2018 Illiana Vegetable Growers Symposium and many of the fresh market vegetable sessions at the 2018 Indiana Hort Congress are available online. Visit https://ag.purdue.edu/hla/fruitveg/Pages/presentations.aspx.


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This article is my response to a grower’s question about lowering soil pH in a high tunnel. The soil test indicated pH of the soil in his high tunnel was 7.7. The high pH could be partially caused by alkaline water he used to use for irrigation. The grower has changed the water source, but high soil pH is still a concern. ‘I have soil sample from the high tunnels if I could have your input on them I would appreciate it. I am concerned with the pH, should I use sulfur to bring it down, if so, how much?’ Following is my response to the grower’s question. My response is mainly based on the publication ‘Lowering Soil pH for Horticulture Crops‘. Purdue Extension HO-241-W. We have a few choices to reduce soil pH. Adding elemental sulfur is one way to do it. If you want to reduce soil pH[Read More…]


The Indiana Vegetable Growers Association board is seeking board members for 3-year terms beginning at the annual meeting in February 2018. Members interested in serving, or with suggestions for potential members, should contact President John Young at jmyoungco@yahoo.com or 5028 E. Landersdale Rd. Mooresville, IN 46158. For more information about the IVGA visit ivga.org.


The Indiana Vegetable Growers Association board is seeking board members for 3-year terms beginning at the annual meeting in February 2018. Members interested in serving, or with suggestions for potential members, should contact President John Young at jmyoungco@yahoo.com or 5028 E. Landersdale Rd. Mooresville, IN 46158. For more information about the IVGA visit ivga.org.


Figure 2. Multi-leaf lettuces grown in a high tunnel (photo credit: Liz Maynard)

Winter farmers markets are becoming more and more popular. Lettuce is a primary type of vegetables grown for the market. As we are finishing up summer crops, it is a good time to learn and refresh knowledge about lettuce. This article discusses some of the basics of growing lettuce in high tunnels, as well as the lessons we learned from a trial conducted at Southwest Purdue Ag Center in fall 2016. Lettuce Types Lettuce has multiple morphological forms major types include crisphead (iceberg), butterhead (bibb), romaine (cos), Batavian (summer crisp), and multi-leaf lettuce (salanova). The first decision about growing lettuce is whether to harvest full-size heads of lettuce, or to harvest ‘baby-leaf’ lettuce (Figure 1). These harvest methods require very different production practices. Full-size heads are harvested one time as a single head of leaves. Baby-leaf lettuce is first harvested when single leaves reach about 4 to 5 inches, and[Read More…]


Figure 1. Yellowstriped armyworm on tomato leaf.

We are seeing small caterpillars feeding on tomato leaves in high tunnels at Pinney Purdue. The first sign may be feeding partially through the leaf, or ‘windowpane’ feeding, or small holes on the leaf. By turning the leaf over we find a yellowstriped armyworm or hornworm (Figures 1 and 2). In the morning, we find moths clustered along the hipboard at the top of the sidewall (Figure 3). See Rick Foster’s articles in this issue for information on control.  


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Dr. Steve Weller, professor and extension weed scientist in the Dept. of Horticulture and Landscape Architecture is retiring from Purdue. I’m sure many readers share the Purdue Vegetable Extension team’s appreciation for all the work he has done to help vegetable growers with weed management and wish him the best in life’s next adventures. Thanks from all of us, Steve! You will be missed.