Establishing a Meadow, the Good, the Bad, and the Beautiful

Wednesday, June 12, 2019     6:30 p.m.
Carvel Research & Education Center
16483 County Seat Highway
Georgetown, DE

Master Gardeners Sandi Dew and Judy Pfister will present this workshop. Learn about some of the challenges, successes and failures experienced in establishing the new demonstration meadow in our Demonstration Garden. We will tour our Meadow. The evening will end with the movie Five Seasons, The Gardens of Piet Oudolf. Oudolf is a renowned landscape designer, this film highlights his creative process and the resulting gardens.

Register online or contact Tammy Schirmer, 302-856-7303.


Pest and Beneficial Insect Walk

Wednesday, June 5, 2019     4:00-6:30 pm
Sussex County Extension Office
16483 County Seat Highway
Georgetown, DE

Learn to identify insect and disease pests, as well as beneficial insects in the landscape at the Sussex County Extension Office. Learn about pests on ash trees, and how to differentiate between common and invasive insects such as borers.

Instructors: Nancy Gregory, Brian Kunkel, and Tracy Wootten

Credits: 2 ISA, 2 Pest., 1 CNP

Cost is $15

Register online or call/email Tracy Wootten (302) 856-7303 or

Integrated Pest Management Implementation Workshop

Monday, July 8, 2019

Delaware State University, Smyrna Outreach Research Center
884 Smyrna-Leipsic Road, Smyrna, 19977-3440

The workshop will cover:
● Integrated Pest Management Strategies
● Insect and Mites: life cycles, detection methods, monitoring thresholds and control options
● Experience with predatory mites
● Housing pests and control
● Weed management and cover cropping for specialty crop growers

Speakers include;

Lerman Dion Lewis
Penn State Center

David Owens
University of Delaware

Cerruti Hooks
University of Maryland, College Park

Brian Kunkel
University of Delaware

Registration is Open and Free. To register—please contact Rose Ogutu Phone number 302-857-6397

New Castle County’s Marl Pit Tailgate Session

Tuesday, June 4, 2019     6:00 – 8:00 p.m.
UD Cooperative Extension Research Demonstration Area
¾ Mile east of Armstrong Corner, on Marl Pit Rd. – Road 429, Middletown

Bring a tailgate or a lawn chair

Join your fellow producers and the UD Extension team for a discussion of this year’s demonstration trials and current production issues. Other topics will include nutrient management, pest management and weed management. This session will inform producers of timely topics observed and occurring in 2019. An overview of ongoing research in New Castle and state-wide will also be included.

We will wrap up with the traditional ice cream treat.

Credits: Nutrient Management (1), Pesticide (1)

The meeting is free and everyone interested in attending is welcome. Mark your calendar and call (302) 831-2506 to register by Friday, May 24. If you have special needs in accessing this program, please call the office two weeks in advance.

Welcome and Introductions
Dan Severson, University of Delaware Cooperative Extension

Overview of Small Grains Variety Trials at Marl Pit
Victor Green, University of Delaware Extension

Weed and Cover Crop Update
Mark VanGessel, University of Delaware Cooperative Extension Weed Specialist

2019 Insect Pest Outlook
David Owens, University of Delaware Extension Entomologist

Each year brings different pest management challenges. Issues from 2018 will be reviewed, and stakeholders advised what to be on the lookout for in 2019. Current projects include cover crops, slug management research, Dectes stem borer, and prophylactic insecticides.

Nutrient Management Update
Amy Shober, University of Delaware Extension Nutrient Management Specialist

Agronomy Update
Jarrod Miller, University of Delaware Extension Agronomy Specialist
Agronomic updates over the last year include cover crop impacts on cash crop stands, tissue tests for critical nutrients, and some research into planting populations for wheat.

Plant Pathology Update
Alyssa Koehler, University of Delaware Plant Pathologist Specialist
Discussion will cover common disease symptoms, growth stages most susceptible to disease, fungicide application methods and associated costs, as well as in season scenarios that may affect fungicide decisions.

Conclusion and Evaluations
Dan Severson, University of Delaware Cooperative Extension




DSU Blueberry Field Day

Tuesday, June 18, 2019     8:30 a.m. to 2:30 p.m.
Delaware State University
Outreach & Research Center
884 Smyrna-Leipsic Road, Smyrna, DE

Dr. Dharma Pitchay, Associate Professor, Tennessee State University
A representative from USDA local office, DE

Open to the public. Commercial and Residential Producers are welcomes to this FREE Event.

Blueberries can be a profitable, specialty crop that commercial and backyard growers can produce successfully. Participants will be guided through the soil and water testing process as well as discuss production aspects of blueberries. Participants will gain hands-on knowledge of proper planting and pruning techniques to maximize disease prevention and insect control, thus maximizing plant health and productivity.

Interested participants are requested to bring soil sample (1/2 lb) from their plot where they plant blueberries and water sample (30 ml) they apply during irrigation to test pH.

Class space is limited – registration is required: Register by contacting Lekha Paudel, at 302-857-7796 or email

Guess the Pest! Week 7 & 8

David Owens, Extension Entomologist,

There is still time to guess what is going on with corn. Below is another image of field corn being affected by the same cause. This image actually is a two-fer, there is slug injury on the bottom leaves, but slugs do not cause the whorl wilting. This plant will not recover. Less severe injury will show up as the yellowing in last week’s images.

To submit your answer, please go to:

Corn Leaf Stages and Growing Degree Days

Jarrod O. Miller, Extension Agronomist,

With the fluctuation in temperatures since mid-April, corn emergence and growth has shifted week to week. At the research station, we have observed corn emergence take up to ten days planted April 24th, but only five when it was planted May 8th. Rising temperatures accumulate growing degree days (GDD) in less time, so that would be expected. Looking across the region, any corn planted on May 12th should have already emerged in Sussex, or be close to emerging in New Castle (as of May 20th).

Following emergence, the next important stage to manage is V6-V8, where you would typically sidedress corn. The V stage means six leaf collars, which can be identified as the white circle around the base of a corn leaf (Figure 1). Emerging, or recently emerging corn leaves will not have a collar yet. In Figure 1, counting the collars puts this field at V3. As you scout fields, some plants may be at the next stage, while the rest will catch up in a day or two.

Statewide temperatures and rainfall since April 1st can be seen in Figures 2 and 3. The rapid increase in temperature over the last week should have sped up emergence as well as advancing corn to the next stages. Rainfall over the weekend mostly hit the southern part of the state, increasing totals around Dagsboro and Delmar, but we have seen total rainfall of 6-9 inches since April 1st across the state.

Figure 1. Locating leaf collars on corn (left). Counting these collars will get you the corn stage (V3 in this case) to compare to GDD (right).

Table 1. Accumulated growing degree-days based on planting dates through May 20th.

If you planted

Sussex Kent New Castle
14-Apr 498 465 441
21-Apr 407 372 354
28-Apr 325 297 274
5-May 225 216 202
12-May 125 118 112

Emergence = 120 GDD, V6 = 475 GDD.

Figure 2. Statewide temperatures since April 1st.

Figure 3. Statewide rainfall accumulation since April 1st.

Pythium Causing Damping Off in Corn

Alyssa Koehler, Extension Field Crops Pathologist;

Over the past week, post-emergent damping off of corn has been present across the state. In most cases, this damping off has been caused by Pythium sp. Symptoms can include stunted, slower growing plants, to severely infected, dead plants (Figure 1). Infected plants typically have brown, rotted roots and mesocotyl. In severely infected plants, the top of the plant may be completely separated from the root system, resulting in plant death (Figure 2). Damping off from Pythium is common in low field areas that hold more moisture, but wet, cool spring conditions have favored development across entire fields this season.

Figure 1: Damping-off of corn caused by Pythium

Pythium is a soilborne fungal-like organism that is able to survive in the soil for many years as oospores. Under favorable environmental conditions, the oospores are able to germinate and produce small zoospores that swim in soil water following root exudates to infect emerging seedlings. Once root systems have developed, seedlings can usually survive mild to moderate Pythium infections. Seed treatments with oomycete activity can provide some protection for 10-14 days after planting, and can be helpful for improving seedling emergence and reducing pre-emergent damping off. This year most issues have occurred as post-emergent damping-off. Multiple species of Pythium are able to infect corn, with each species having a different optimal temperature. We are currently collecting samples to identify which species have been involved in infection this year.

Figure 2: Corn seedling with damping-off caused by Pythium

Agronomic Crop Insect Scouting

David Owens, Extension Entomologist;

Insecticide Update
The following insecticides and seed treatments have been voluntarily removed by the registrants: Meridian 0.20G, Meridian 0.14G, Avicta Complete Corn 500, THX MXM FDL TBZ FS, Adage Deluxe, Adage Premier, Emesto Quantum, V-10170, Inovate Seed Protectant, Inovate Neutral Seed Protectant, Aloft GC, and Flower, Rose&Shrub Care III. More information can be found here:

Early Season Moth Activity

Trap Location True Armyworm per night Black Cutworm per night
Willards, MD 0.1 0.1
Salisbury, MD 0 0.4
Laurel, DE 0 3.3
Seaford, DE 0.4 0.4
Bridgeville, DE 0
Harrington, DE 0.1 0.7
Smyrna, DE 0.3 2.3
Kenton, DE 0 0.3
Pearson’s Corner, DE 0.1 0
Sudlersville, MD 0.7

We have had lower armyworm activity in our blacklights this year compared to last, however you should still look to make sure that you don’t have a population that is clipping heads. If you have significant head clipping, worms are active, and smaller than an inch, you may want to consider an insecticide. Pay attention to pre harvest intervals, as most pyrethroids have a 30 day PHI. Mustang has a 14 day PHI, and Prevathon has a 1 day PHI.