Wenjing Guan

Vegetable Crops Hotline Editor & Clinical Engagement Assistant Professor
Department of Horticulture and Landscape Architecture
Area(s) of Interest: Commercial Vegetable and Melon Production
Wenjing Guan's website

185 articles by this author

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Roger Wenning Annual Field Day Date: July 24, 2018, 9:00 am – Noon, Registration starts 8:30 am Location: Wenning Farms, 1513 N County Road 80 E, Greensburg, IN 47240         Daviess Co. Produce Production Meeting Date: Aug. 14, 2018 6:30 pm – 8:30 pm Location: Daviess Co. Produce Auction, LLC, 5567 N 900 E, Montgomery, IN 47558                                 Small Farm Education Field Day Date: Aug. 30, 2018 Location: Purdue Daniel Turf Center (1340 Cherry Lane, West Lafayette, IN 47907) and Purdue Student Farm (1491 Cherry Lane, West Lafayette, IN 47906)                             Greenhouse and Indoor Hydroponics Workshop Date: Sep. 5, 2018 Location: 625 Agriculture Mall Drive, West Lafayette, IN 47907                    [Read More…]


Does your farm often have excess produce in your growing period? We would love to connect our volunteers to come and glean that produce and put it on a plate of someone who needs this fresh food! Gleaning America’s Fields – Feeding America’s Hungry. We do it simply, effectively, and efficiently. Since 1983, Society of St. Andrew has saved fresh, nutritious produce from America’s farms – produce that otherwise go to waste – and delivered it to hunger-relief agencies. In January 2018, Society of St. Andrew (SoSA) opened a new office in Indiana. The office is based in Indianapolis but the work is throughout the state. SoSA has gleaned here in the past, but will now make a significantly larger impact across the Hoosier State. In the first year, we expect to glean about one million pounds of produce from Indiana farm fields. All of this gleaned food will be[Read More…]


Watermelon harvest is in full swing in southern Indiana. At this time, we frequently see many types of leaf symptoms. Some of them are caused by foliar diseases, such as anthracnose, Alternaria leaf blight and gummy stem blight. These diseases require special attention, normally in the form of fungicide sprays, to slow spread of the disease. However, the appearance of a moderate amount of foliar disease in mid-season doesn’t necessarily need an immediate fungicide application. Other leaf symptoms may not be caused by diseases or insects. Here are some examples of leaf symptoms that are not associated with a pathogen. It is important to correctly identify the source of the symptom to prevent unnecessarily pesticide spray. In the article When a yellow leaf is just a yellow leaf, Dr. Dan Egel discussed general rules for determining if the symptom is a disease or not. If you are not certain whether the symptom[Read More…]




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Small Farm Education Field Day Date: Aug. 30, 2018 Location: Purdue Daniel Turf Center (1340 Cherry Lane, West Lafayette, IN 47907) and Purdue Student Farm (1491 Cherry Lane, West Lafayette, IN 47906) Registration is $10. Register here http://www.cvent.com/d/hgqx6g For questions or reasonable accommodation needs, contact Lori Jolly-Brown  ljollybr@purdue.edu, (765) 494-1296.   Greenhouse and Indoor Hydroponics Workshop Date: Sep. 5, 2018 Location: 625 Agriculture Mall Drive, West Lafayette, IN 47907                            




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2018 Indiana Hort Society Summer Field Tour Date: June 26, 2018 Location: Garwood Orchards, 5911 W 50 South, LaPorte, IN 46350 More information about the field tour can be found at https://vegcropshotline.org/article/summer-field-tour-fruit-and-vegetables/ Small Farm Education Field Day Date: Aug. 30, 2018 Location: Purdue Daniel Turf Center (1340 Cherry Lane, West Lafayette, IN 47907) and Purdue Student Farm (1491 Cherry Lane, West Lafayette, IN 47906) Registration is $10. Register here http://www.cvent.com/d/hgqx6g For questions or reasonable accommodation needs, contact Lori Jolly-Brown  ljollybr@purdue.edu, (765) 494-1296.   Greenhouse and Indoor Hydroponics Workshop Date: Sep. 5, 2018 Location: 625 Agriculture Mall Drive, West Lafayette, IN 47907  


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We have received several calls recently reporting observations of leaf curling on tomatoes. Although several factors (disease, insect, herbicide, environmental stress etc.) could cause leaf curling, in late spring and early summer, we notice the majority of the leaf curling is caused by physiological factors that in general do not directly affect tomato yield and fruit quality. In a similar way to other vegetables, hot and dry conditions may cause leaf curling on tomatoes. In late spring and early summer, plants that are actively growing and developing fruit have a high demand for water. Under hot and dry conditions, plants respond by rolling the leaves to reduce the surface area exposed to high radiation. Lower leaves on a tomato plant are often affected first, they may recover if environmental stresses are reduced. But with some varieties, leaf curling may occur on most leaves of a plant and last for the[Read More…]