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Horticulture Questions?
Have questions regarding your lawn, garden, trees or shrubs? Have an insect you would like to identify? Call the Horticulture Help Desk at 920-391-4615 or e-mail:
Sunday, July 15, 2018 column by Vijai Pandian
Managing Japanese Beetles with lesser impact on bees
Japanese beetles are going to be horrendous this year. They are widespread in the Brown County area and according to our UWEX state entomologist, the Japanese beetle populations are likely to be higher in the state compared to previous years. Gardeners need to be conscious in their usage of insecticides to manage the beetle populations, especially when bees and other beneficial insects are in their peak time for foraging pollens and nectars. Here are some options in managing Japanese beetle adults and grubs in landscapes and turf that can have minimum impact on pollinators:
  1. No foliar spray is needed for mature woody ornamentals. Mature trees and shrubs have more tolerance to the feeding damage caused by the adult beetles and will leaf out again next year.
  2. Small-sized landscape plants such as roses, vegetable crops, strawberries, and raspberries can be protected using nylon insect screens or floating row cover (white polyester spun bonded fabric) from afternoon until late evening hours. Drape the fabric over the plant and pin it to the ground. However, do not use the fabric/ insect screens on blooming vegetable crops like pumpkins and squash, as they require bees for pollination. The fabric should not be used if the day temperature reaches above 85 F.
  3. A new bacterial insecticide called Bacillus thuringiensis galleriae (Bt galleriae) is moderately effective on adult Japanese beetles and can be applied on the foliage of small sized landscape plants and vegetable crops. This bacterial insecticide doesn’t affect pollinators. Shop online to find the Bt galleriae ingredient product.
  4. Hand-picking and drowning the beetle in soapy water is another option to consider if you find few beetles in the garden.
  5. Acelepryn is a relatively new insecticide product in the market and is known to provide good control on Japanese beetles as a foliar application. Additionally, it is non-hazardous to bees. You can obtain acelepryn through wholesale landscape vendors. It is registered for ornamental plant use only.
  6. On fruits and vegetables, standard organic products like neem oil and spinosad can be sprayed during late evening hours when there is reduced bee or other pollinator activity. Be sure to read the product label for its instructions, post-harvest interval period, and safety.
  7. Do not use Japanese beetle traps for control, as they will attract thousands of beetles towards your landscape and can result in more damage.
  8. On turf, withhold your irrigation from July to mid-August when the beetles are in their peak active season. This will help in preventing the beetles from laying their eggs in your turf.
  9. Before scheduling any preventive grub applications in your turf, mow any flowering weeds like clovers in your lawn to prevent bee toxicity. Or use acelepryn insecticide for preventive application since it is known to be non-hazardous to bees. Immediately after application, schedule a light irrigation (1/8 inch) to leach the product into the thatch layer.

What We Do

We provide educational programs by teaming up with agriculture; meeting community challenges; protecting natural resources; strengthening Wisconsin's families; and supporting young people through 6 program areas:

- Agriculture and Natural Resources
- Community, Natural Resource & Economic Development
- Family Living Programs
- 4-H Youth Development
- Wisconsin Geological & Natural History Survey
- Leadership Wisconsin

Our educational programs are developed and measured against our strategic directives, aiming to build:

- Stronger communities
- Food safety, security and health
- Resilient and productive environments
- Thriving youth, families and communities

Upcoming Events

Brown County UW-Extension
& NEW Master Gardeners
2018 Horticulture Classes
Best Ornamental Trees for Your Landscape – Tuesday, September 11; 6-7:30 PM, Green Bay Botanical Garden, 2600 Larsen Rd, Green Bay: Take a walk through the Green Bay Botanical Garden with Vijai Pandian, UW-Extension Horticulture Educator, to learn about trees that you can include in your own landscape. Cost is $7 payable to NEW Master Gardeners for preregistration ($10 at the door). Pre-register by sending your contact information and payment to: Hort Dept., Brown County UW-Extension, 210 Museum Place, Green Bay, WI 54303.
Pay your class fees online...
For more information, contact:
Brown County UW-Extension Horticulture Department at 920-391-4650

Explore Wisconsin's Native Bee Diversity

Neville Public Museum
September 25, 2018
6:00pm to 7:00pm

In conjunction with BEES!, join us as we explore some of the over four hundred species of native bees found in Wisconsin. We will discuss their roles in the environment and the importance of the pollination services that they provide. We may also see and discuss a few of the many other non-bee pollinators found in the state.

Speaker: Dr. Craig Brabant: Academic Curator of the Wisconsin Insect
Research Collection at UW-Madison.

Program Cost: $7.00 to attend and includes admission to explore
the museum and their new exhibit Bees!

Pre-registration is required by September 21, 2018.

To register:
- Online by clicking here
- Call UW-Extension at 920-391-4650
- Mail a check, payable to Neville Public Museum, to:
210 Museum Place
Green Bay, WI 54303

Sorry, no refunds.

Donate Extra Garden Produce to Local Pantries

Harvest season is starting, and soon many home gardeners will be swimming in produce. This year, make sure excess produce doesn't go to waste by signing up to participate in Planting for a Purpose, a joint project of the Green Bay Packers Give Back and the Brown County UW-Extension Community Gardens Program to encourage gardeners to donate fresh produce to food pantries.

Many local pantries accept fresh produce donations and have need for more donations to meet clients' needs. Join the effort by signing up to participate here. There is no minimum donation amount. All participants can pick up a free pair of gardening gloves and a garden kneeler.

Have questions regarding your lawn, garden, trees or shrubs? Have an insect you would like to identify? Call the Horticulture Help Desk at 920-391-4615 or e-mail:

Soil Testing
If you have questions about soil testing, please click here.

4-H and Youth Development
Developing leadership, character and good citizenship in America's youth while having fun!


Compostable Bags are Still Available at UW-Extension
Although UW-Extension will no longer have an organic food waste dumpster on site, we still sell compostable bags at our new location: Neville Public Museum, 210 Museum Place, Green Bay, WI 54303.

2 gallon bags - $0.25 each or $5.00 for a roll of 25 bags
3 gallon bags - $0.25 each or $5.00 for a roll of 25 bags
8 gallon bags - $0.50 each or $5.00 for a roll of 25 bags

For more information about the Brown County Food & Organic Waste Program, click here.

Notice: the organic waste dumpster that was once located at our old premises (1150 Bellevue St) will be moved to a new location. The dumpster will be moved to the Village of Allouez yard waste center, at the end of LeBrun Road. A date as to when the dumpster will be accessible is yet to be determined.

Click here for more information »

Contact:  Judy Knudsen - Area Extension Educator
Phone: 920-391-4610
Fax: 920-391-4617
Click here to email
Mailing Address:  210 Museum Place
Green Bay, WI 54303
Hours:  8:00 a.m. - 4:30 p.m. Monday - Friday
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