January 2023 - 20

GLVPN VEG CONNECTION
Managing asparagus beetles all year long
BY JEN ZAVALNITSKAYA & ZSOFIA SZENDREI
MICHIGAN STATE UNIVERSITY, DEPARTMENT OF
ENTOMOLOGY
A
sparagus beetles are a regular yet troublesome
sight in asparagus fields during the summer.
These pests, however, are in asparagus fields
all year long. While it may seem like this is more bad
news, staying on top of asparagus beetles year-round is
important for the longevity and health of the fields.
Researchers at Michigan State University have been
investigating a variety of beetle management methods
that farmers can use, no matter the time of year.
Winter management
Most asparagus growers are familiar with those
pesky asparagus beetles munching on the crop - we
see them all spring and summer - but where do they
go in the winter months?
Asparagus beetles begin overwintering as adults
from late September to October. While the beetles
can overwinter in nearby
woods, their favorite
place is inside of the
crop field. In asparagus
fields, more beetles
survive the winter
when they can hide in
decaying asparagus
stalks left over from
the previous season
or among deciduous
leaves blowing in from
surrounding woods (Fig.
1). Asparagus farms that
have more dead trees in
the surrounding woods
have fewer asparagus
beetles, indicating
that deciduous leaves
swept by the wind into
the asparagus field can
provide overwintering shelter. So both deciduous leaf
Figure 1. Asparagus beetle
adults overwintering in
decaying asparagus stems.
Photo: Jen Zavalnitskaya &
Zsofia Szendrei
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January 2023

Table of Contents for the Digital Edition of January 2023

January 2023 - 1
January 2023 - 2
January 2023 - 3
January 2023 - 4
January 2023 - 5
January 2023 - 6
January 2023 - 7
January 2023 - 8
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