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Now Showing: Posts by Dr. Albrecht Koppenhöfer 74 Posts

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ABW ante portas: get ready for this ABW seasonMarch 25, 2026

A colder‑than‑usual winter and an early‑March warm spell have shifted ABW timing.

ABW status in late August in New JerseyAugust 25, 2025

ABW adult densities are fairly low. No significant damage anywhere on my golf courses and research plots.

ABW summer generation mostly lowJuly 28, 2025

Just because there were real problems in spring does not necessarily mean that ABW might not rear its head during summer.

Time to start scouting for ABW adults: Spring ABW generation approaching completionJune 17, 2025

If you are planning to apply an adulticide to manage the adults of the ABW spring generation, it is time to start scouting for them.

Timing for applications targeting mid-size ABW larvae is tricky this year but should be done soonMay 19, 2025

Based on the indicator plants and the larval stage average, it is now time to apply larvicides against the mid-size larvae that have started to exit the plants.

Time to seriously check for ABW adults with peak ABW densities impending in central and northern NJApril 21, 2025

Predicting peak ABW adult densities this year is a real headache, but I expect peak weevil densities to start sometime this week in central and northern New Jersey.

ABW ante portas: Get ready for another ABW seasonMarch 25, 2025

Based on the weather forecast for NJ, we can expect to see the beginning of forsythia full bloom and some adult ABWs on the short-mown turfgrass areas.

ABW summer generation scattered but still mostly lowAugust 26, 2024

Annual bluegrass weevil (ABW) numbers have been, and continue to be, low. However, localized issues are not uncommon this time of year.

ABW summer generation scattered but mostly lowJuly 26, 2024

Due to the warm weather, ABW stages are all over the place now.

Spring generation approaching completion: Start scouting for ABW adults!June 24, 2024

The first new adults from the ABW spring generation have started to show up in central and northern New Jersey, and, with the current hot weather, numbers...

Monitor for mid-size ABW larvae and treat as necessary soonMay 16, 2024

Applications for mid-size ABW larvae are around the corner.

Peak ABW densities impending in central and northern NJApril 16, 2024

We should reach the magical number of GDDs for central and northern NJ by late April; however, the phenological indicator plants are well ahead of the GDDs.

Time to get ready for another ABW seasonMarch 21, 2024

This is a good time for a refresher on predicting weevil activities and timing of ABW-cide applications.

Late August ABW status in New JerseyAugust 30, 2023

Where ABW larval densities are on the higher side, some damage may occur during the hotter and drier days forecasted.

ABW stages are all over the place now in New JerseyJuly 24, 2023

With the forecast for the next week in NJ showing no rain and lots of heat — and with ABW larvae present mostly in the later stages — keep a wary eye...

Start scouting for spring generation ABW adults!June 19, 2023

The first new adults from the annual bluegrass weevil (ABW) spring generation have started to show up in central and northern New Jersey.

Rhododendron full bloom: if necessary, apply larvicides vs. mid-size larvae!May 19, 2023

In central and northern New Jersey, ABW populations are moving along with larvae now present up to the fifth stage. At high larval densities, damage might...

Monitoring for adult ABW: the most efficient method – soap flushesApril 5, 2023

Soap flushing is equally effective on greens and fairways, is not affected by temperature and time of day, and can extract more than 90% of any adults...