Wenjing Guan

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

463 articles by this author

Article List

Southwest Indiana Melon and Vegetable Growers’ Technical Meeting  Date: November 21, 2017 5:00 p.m. to 8:00 p.m. (EST) Location: Southwest Purdue Ag Center (SWPAC), 4369 N. Purdue Road, Vincennes, IN The meeting will start at 5:00 p.m. for board members to discuss topics for the March meeting, which will be held in French Lick, IN. Any member…Read more about Upcoming Events[Read More]


Blackheart of celery is a physiological disorder that causes significant crop loss in major celery production areas. It is characterized by the breakdown of young leaf tissues in the heart of the plants (Figure 1). The affected young tissues turn black, which give it the name “blackheart”.  The cause of blackheart of celery is related…Read more about Blackheart of Celery[Read More]


Soil solarization can be used as a tool for soil disinfestation. It is accomplished by covering moist soil with transparent polyethylene film for 4 to 6 weeks in the summer. During this period, soils are heated to temperatures that are lethal to many soil pathogens, nematodes and weed seeds. This summer we conducted a demonstration…Read more about The Update of Soil Solarization in a High Tunnel at SWPAC[Read More]


Beginning Farmer East Regional Workshop Date: Oct. 28, 2017, 8:30 am – 4 pm Location: Randolph County Fairgrounds, 1885 U.S. Route 27, Winchester Attendees for this workshop can learn about: Business planning Pasture management Fruit and vegetable pest management Pastured poultry Greenhouse and high tunnel management Marketing products Purdue Extension experts will be available to…Read more about Upcoming Events[Read More]


Hydroponics Workshop II Date: Sep 8, 2017, 7:30 am – noon. Location: WSLR 116, Horticulture & Landscape Architecture 170 S. University St. Purdue University West Lafayette, IN 47907 Registration: http://tinyurl.com/yb4dnwrh For further questions contact Lori Jolly-Brown, ljollybr@purdue.edu, (765) 494-1296 In this workshop, you will learn about: LED lighting for winter produce in greenhouses Things to know about…Read more about Upcoming Events[Read More]


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…Read more about Facts about Lettuce[Read More]


Tomato foliar diseases such as early blight, Septoria leaf blight, bacterial spot and speck that are commonly seen in the field are often less common on tomatoes grown in greenhouses and high tunnels. It is also true that high tunnel tomatoes have smoother skins than tomatoes grown in the fields. An important factor that determines…Read more about Using Season-long Retractable Tunnels May Help Control Foliar Diseases and Improve Fruit Quality of Tomatoes[Read More]


U.S. planting zones


Organic Vegetable Seed Production & Varietal Selection Workshop Date: August 22, 2017, 9:00 am – 3:00 pm. Location: Daniel Turf Center, 1340 Cherry Ln, West Lafayette, IN, 47907. Registration: http://tinyurl.com/y7da7dsh Topics include Seed biology fundamentals; Harvesting, processing, and storing seed; Population size and isolation requirements; Managing pathogens during seed production and after harvest; On-farm variety…Read more about Upcoming Events[Read More]


Farmer Rancher Program Farmers and ranchers are invited to submit grant proposals to explore sustainable agriculture solutions to problems on the farm or ranch. There are three types of competitive grants: individual grants ($7,500 maximum), team of two grants for two farmers/ranchers from separate operations who are working together ($15,000 maximum), and group grants for…Read more about The 2018 North Central Region – Sustainable Agriculture Research & Education Grant Opportunities[Read More]