Guess the Pest! Week 2

David Owens, Extension Entomologist, owensd@udel.edu

Test your pest management knowledge by clicking on the GUESS THE PEST logo and submitting your best guess. For the 2019 season, we will have an “end of season” raffle for a $100.00 gift card. Each week, one lucky winner will also be selected for a prize and have their name entered not once but five times into the end of season raffle. A lucky winner will also receive a heavy duty sweep net.

Why are we concerned when we see these?

To submit your guess, click the Guess the Pest logo or go to: https://docs.google.com/forms/d/e/1FAIpQLSfUPYLZnTRsol46hXmgqj8fvt5f8-JI0eEUHb3QJaNDLG_4kg/viewform?c=0&w=1

Guess the Pest! Week 1 Answer: Cabbage White

David Owens, Extension Entomologist, owensd@udel.edu

Congratulations to Joe Streett for correctly identifying last week’s Guess the Pest challenge as cabbage white, also known as the imported cabbageworm. Joe won a heavy duty sweep net for catching the butterflies and will be entered for the end of season raffle along with all others who submitted correct answers. This is one of the early harbingers of spring. I saw my first April 1 and it is now the most common butterfly out. It is a Brassica specialist. Females lay eggs on wild mustard, brassica cover crops like turnip or radish, and cultivated brassicas such as broccoli and cabbage which are being transplanted now. Larvae are green, about an inch long, and fuzzy. They are easiest to find when ‘hiding’ on the leaf’s upper midrib. Pre heading, brassicas can tolerate a good deal of defoliation (30% infested plants), but once heading initiates, thresholds for this and other defoliating worms drop to 5%.

Guess the Pest! Week 1

David Owens, Extension Entomologist, owensd@udel.edu

Guess the Pest is back for 2019! Test your pest management knowledge by clicking on the GUESS THE PEST logo and submitting your best guess. For the 2019 season, we will have an “end of season” raffle for a $100 gift card. Each week, one lucky winner will also be selected for a prize and have their name entered not once but five times into the end of season raffle.

This year, weekly winners will win a heavy duty sweep net, a valuable tool in the field, for building insect collections, and avoiding awkward confrontations, because no one messes with someone using a sweep net.

What is this early spring insect?

Photo by Mary C. Legg, bugwood.org

To submit your guess, click the Guess the Pest logo or go to: https://docs.google.com/forms/d/e/1FAIpQLSfUPYLZnTRsol46hXmgqj8fvt5f8-JI0eEUHb3QJaNDLG_4kg/viewform?c=0&w=1

Guess the Pest! End of Season Raffle Winner Announced!

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Thanks to all that followed along each week and submitted answers. Click on the Guess the Pest Logo to see who won the “end of season” raffle for the $100 gift card. Everyone that submitted a correct answer was automatically entered into the raffle for each correct answer that was submitted. If you were a weekly winner, your name was entered not once but five times into the end of season raffle for that week.

Also, if you were a weekly winner, I have your copy of A Farmer’s Guide to Corn Diseases and will be contacting you soon to distribute them.

Guess the Pest! Week #25 Answer: Brown Stem Rot of Soybean

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Congratulations to Jacob Urian for correctly identifying the disease as brown stem rot and for being selected to be entered into the end of season raffle for $100 not once but five times. Everyone else who guessed correctly will also have their name entered into the raffle.

Guess the Pest Week #25 Answer: Brown Stem Rot of Soybean
By Nancy Gregory, Plant Diagnostician; ngregory@udel.edu

Brown stem rot of soybean is caused by the fungus Cadophora. Brown stem rot symptoms on stems include a general browning that extends from the soil line up the stem, or starts at a node. Symptoms usually show up in mid-summer/pod fill. When affected stems are split lengthwise, there is a brown discoloration of the vascular tissue. Remnants of the pith made be observed in a ladder like pattern. Foliar symptoms look like sudden death syndrome but Fusarium would be found on basal stems with SDS. Symptoms for both diseases tend to be more severe in fields with soybean cyst nematode.

The BSR fungus survives in soybean residue in the soil, but not on seed, and infects roots early in the season during wet, cool conditions. Univ of Wisconsin researchers have shown that a pH lower than 6.5 favors the development of BSR. Management of brown stem rot includes crop rotation, good residue decomposition and selection of resistant varieties. Some resistance is available to BSR and to SCN. Seed treatments and fungicides do not control brown stem rot.

This was the last Guess the Pest challenge for the 2018 growing season.

Thanks to all that followed along each week and submitted answers. Next week, we will hold the “end of season” raffle for the $100 gift card. Everyone that submitted a correct answer will automatically be entered into the raffle for each correct answer that was submitted. If you were a weekly winner, you will have your name entered not once but five times into the end of season raffle. I will also be contacting you soon to make arrangements to get you a copy of A Farmer’s Guide to Corn Diseases.

Guess the Pest! Week #25

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Test your pest management knowledge by clicking on the GUESS THE PEST logo and submitting your best guess. For the 2018 season, we will have an “end of season” raffle for a $100.00 gift card. Each week, one lucky winner will also be selected for a prize and have their name entered not once but five times into the end of season raffle.

This week, one lucky participant will also win A Farmer’s Guide To Corn Diseases ($29.95 value).

You can’t win if you don’t play!

Guess the Pest Week 25:

What is this disease?

Guess the Pest! Week #24

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Test your pest management knowledge by clicking on the GUESS THE PEST logo and submitting your best guess. For the 2018 season, we will have an “end of season” raffle for a $100.00 gift card. Each week, one lucky winner will also be selected for a prize and have their name entered not once but five times into the end of season raffle.

This week, one lucky participant will also win A Farmer’s Guide To Corn Diseases ($29.95 value).

You can’t win if you don’t play!

Guess the Pest Week 24:

What is this insect?

Guess the Pest! Week #23 Answer: Sudden Death Syndrome of Soybean

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Congratulations to Lamar Witmer for correctly identifying the disease as sudden death syndrome of soybean and for being selected to be entered into the end of season raffle for $100 not once but five times. Everyone else who guessed correctly will also have their name entered into the raffle. Click on the Guess the Pest logo to participate in this week’s Guess the Pest challenge!

Guess the Pest Week #23 Answer: Sudden Death Syndrome of Soybean
by Nancy Gregory, Plant Diagnostician; ngregory@udel.edu

Sudden death syndrome of soybeans (SDS) is caused by the fungus Fusarium virguliforme. We started seeing this disease in Delaware in 2002 in cool and wet seasons, but have seen it more often in the past few years. SDS can be confused with other stem diseases such as Phomopsis stem canker and charcoal rot. Leaf symptoms of yellowing and browning between the veins are typical, and leaves shrivel and fall off, leaving petioles still on the stems. If stems are pulled up and placed in a plastic bag overnight, blue spore masses of the fungus may be seen at the base of stems. The internal stem tissue (cortex) may show dark discoloration. There is a toxin produced by the fungus that is responsible for the symptom pattern showing up at the top of the plant. The fungus overwinters in debris, and disease is most severe when infection occurs early. Improving drainage, alleviating compaction, and treating seed may help get seedlings established.

Guess the Pest! Week #23

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Test your pest management knowledge by clicking on the GUESS THE PEST logo and submitting your best guess. For the 2018 season, we will have an “end of season” raffle for a $100.00 gift card. Each week, one lucky winner will also be selected for a prize and have their name entered not once but five times into the end of season raffle.

This week, one lucky participant will also win A Farmer’s Guide To Corn Diseases ($29.95 value).

You can’t win if you don’t play!

What is this disease?

Guess the Pest! Week #22 Answer: Helicoverpa zea, Corn Earworm

Bill Cissel, Extension Agent – Integrated Pest Management; bcissel@udel.edu

Congratulations to Amanda Heilman for correctly identifying the insect as an adult corn earworm and for being selected to be entered into the end of season raffle for $100 not once but five times. Everyone else who guessed correctly will also have their name entered into the raffle. Click on the Guess the Pest logo to participate in this week’s Guess the Pest challenge!

Guess the Pest Week #22 Answer: Helicoverpa zea, commonly known as corn earworm

The moth in the photograph is an adult Helicoverpa zea, commonly referred to as a corn earworm. The adult moth is a nectar feeder and not considered a pest. However, corn earworm larvae are considered by some to be the most economically important crop pest in North America. They are highly polyphagous meaning they feed on many different species of plants. Corn, especially sweet corn, is a preferred host plant. However, they also attack soybean, sorghum, snap bean, tomato, and cotton to name a few. Larvae prefer to feed on reproductive plant structures including blossoms, buds, and fruits. It is because of this large host range, and the fact that Helicoverpa zea larvae are so destructive that they are known by several other common names including tomato fruitworm, cotton bollworm, and podworm.