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

457 articles by this author

Article List

High Tunnel Tour at SWPAC Location: Southwest Purdue Agricultural Center, 4369 North Purdue Road, Vincennes, IN 47591 Date: May 9, 2016, 3:00 PM to 5:00 PM EST Please join us for a high tunnel tour at Southwest Purdue Agricultural Center. You will see state-of-the-art high tunnels, learn about season extension of strawberry production under high…Read more about Upcoming Events[Read More]


We went through an unseasonably cold period in early April (Figure 1). In southern Indiana, a few high tunnel tomato growers have already planted their crops. These plants may need some extra help. In Vincennes, IN, we used row covers to cover the newly planted tomatoes in high tunnels the past few nights, our recorded lowest temperature…Read more about Minimum Temperatures from April 9-11[Read More]


Soil pH plays an important role in plant nutrition. However, we might not be familiar with how nitrogen fertilizers influence soil pH over time. This article explains how nitrogen fertilizers influence soil pH over time and discusses some considerations in choosing N fertilizers. Plants can take up N in two forms: ammonium and nitrate. Ammonium…Read more about Effects of Nitrogen Fertilizers on Soil pH[Read More]


The VAPG program helps agricultural producers enter into value added activities related to the processing and marketing of bio-based, value-added products. Independent producers, agricultural producer groups, farmer- or rancher-cooperatives and majority-controlled producer-based business ventures are eligible to apply for the program. Beginning farmer or rancher, a small or medium-sized farm or ranch structured as family…Read more about USDA Announced Value Added Producer Grants (VAPG)[Read More]


U.S. EPA approved a supplemental label to use Kerb SC® herbicide in leaf lettuce. Kerb® is a selective herbicide for control of certain annual grasses and broadleaf weeds. It can be used in direct seeded or transplanted leaf lettuce. Application can be made before or after planting but must be made prior to weed emergence….Read more about Kerb SC Labeled for Leaf Lettuce[Read More]


Food Safety Program A series of workshops will help produce marketers better understand food safety practices to lower the risk of contamination by a foodborne illness. Workshop “On-Farm Food Safety for Produce Direct Marketers” will be held on the following dates and locations (all times local): * March 23: Allen County Extension Office, 4001 Crescent Ave.,…Read more about Upcoming Events[Read More]


Tomatoes grown in controlled environment are exposed to conditions that are different from their original habitats. As a result, varieties that are not specifically bred for greenhouse production may respond to the controlled environment with abnormal symptoms. One group of the symptoms is called edema. Bumps, galls or blisters develop on tomato leaves, petioles or…Read more about Edema on Tomato Rootstocks[Read More]


If you are an Indiana beekeeper and if you are under 22, please note the 2016 Young Beekeeper of the Year Award  This is a statewide contest with great prizes. Application procedure and additional information can be found at YBA Information-Application Form. Application deadline is September 1, 2016.


If you received a hard copy of the Midwest Cantaloupe Variety Trial in Southwest Indiana-2015 at the Southwest Indiana Melon and Vegetable Growers Technical meeting in December, 2015, please note there was a mistake in Table 3, the firmness and fruit size columns. The corrected version of this report is available at https://ag.purdue.edu/hla/fruitveg/MidWest%20Trial%20Reports/2015/02-01_Guan_Cantaloupe.pdf. We are…Read more about Correction of the 2015 Cantaloupe Variety Trial Report in Southwest Indiana[Read More]


If you are an organic grower and use manure and compost, you might be interested in spending a few minutes to participate this survey conducted by University of California-Davis, The Organic Center and Organic Trade Association. The purpose of the survey is to characterize the use of manure and compost based soil amendments. Results from…Read more about Survey about the Use of Manure and Compost[Read More]