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

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At Southwest Purdue Ag Center (SWPAC), more than 10 inches of rain fell since July 7; over 8 inches happened since the evening of July 24. Soil water content on the unirrigated tomato/pepper/eggplant bed (12’’ under plastic mulch) increased from  10% (early July) to about 15% after 3 inches of rain on July 7-9. The…Read more about Irrigation Demonstration Update July 27, 2022 Southwest Purdue Ag Center[Read More]


We received more than 8 inches of rain since the evening of July 24 at Southwest Purdue Ag Center. This article discusses a few plant physiological disorders we observed after the heavy rains. We noticed a large percentage of cracked fruit on tomatoes at the stem end (Figure 1). Fruit cracking is a physiological disorder…Read more about Physiological Disorders after Heavy Rains[Read More]


We discussed insect pests and weed control during renovation in the July episode. Our special guests are Drs. Stephen Meyers, Samantha Willden, and Mr. David Doud. Steve and Sam are researchers from Purdue. Steve is the weed scientist in the Horticulture department; Sam is a postdoc researcher in the entomology department. David is the owner…Read more about Strawberry Chat July—Weed Control and Insect Pest Management[Read More]


We observed a large amount of unmarketable pepper fruit hanging on the plants during on-farm visits and at the research farms recently. Damage appears on the sides or at the bottom of the fruit (Figure 1). The symptoms that occur at the fruit bottom are similar to tomato blossom end rot (BER), a plant physiological…Read more about Unmarketable Bell Peppers[Read More]


After planting on May 16, we only received 1.4 inches of rain in June. The early-setting tomatoes on plants grown on the unirrigated bed had more than 40% fruit blossom end rot (BER) (recorded on June 23). It was 3% on plants grown in a bed that received 17 irrigation events in June and 10%…Read more about Irrigation Demonstration Update — SWPAC July 13[Read More]


Fruit set of seedless watermelons is reliant on growth hormones released by pollen tube growth and fertilization, the same as seeded watermelons. Pollen from the seedless plants, however, is not viable, thus it is crucial to have viable pollen from seeded cultivars transfer to the female flowers of the seedless plants. The plants that contribute…Read more about Pollenizer Cultivar Observation for Seedless Watermelon Production[Read More]


At Southwest Purdue Ag Center (SWPAC) and Pinney Purdue Ag Center (PPAC), we demonstrate irrigation impacts on several fruiting vegetable crops. Tomato, pepper, eggplant, watermelon, and cantaloupe are planted on plastic-covered beds with drip tapes. They grow on beds side-by-side with and without irrigation. We used two approaches to schedule irrigation, one bed is irrigated based on…Read more about Irrigation Demonstration Update June 25[Read More]


The U.S. Department of Agriculture (USDA) Farm Service Agency (FSA) is now accepting nominations for county committee members. Elections will occur in certain Local Administrative Areas (LAA) for members. LAAs are elective areas for FSA committees in a single county or multi-county jurisdiction. This may include LAAs that are focused on an urban or suburban…Read more about Farm Service Agency Now Accepting Nominations for Farmers to Serve on Local County Committees[Read More]


June 30, 2022 is the last day to sign up for the 2022 Ag Census. If you have never received a census and are new to NASS surveys, sign up to be counted today. You do not need to sign up if you already receive NASS surveys. Key Dates: June 30, 2022 – sign up ends November 2022…Read more about Sign Up for 2022 Ag Census by June 30[Read More]


Strawberry harvest is coming to an end in most states. A couple of diseases were found. In addition to botrytis fruit rot and common leaf spot that farmers are familiar with, anthracnose was found caused severe damage in plasticulture production in southern Indiana. Part of the reason is the high temperature followed by frequent rainfalls…Read more about Strawberry Pests Observed in 2022 Season[Read More]