January 2023 - 21

GLVPN VEG CONNECTION
litter and hollow asparagus stalks are sustaining
beetle populations through the winter.
Residue management may be the key to controlling
these overwintering populations. Breaking down
the plant residue left in the field for winter could
allow the decaying process to disintegrate pieces of
overwintering material. The Vegetable Entomology
Lab at Michigan State University is currently planning
trials using different times of mowing to reduce
beetle overwintering sites.
Spring and summer management
Asparagus beetles start their activity in the spring
right before asparagus harvest begins. They find tender
new stalks to devour and lay eggs on. When asparagus
stalks are ready to harvest, beetle populations are
reaching their peak. To manage beetles during harvest,
an effective insecticide spraying regimen is essential.
Common conventional insecticide active ingredients
include acetamiprid, methomyl, permethrin and
carbaryl. However, organic insecticide options like
neem oil, pyrethrum and spinosad could be useful
because of their short pre-harvest intervals.
In June 2020, MSU researchers conducted a spray
trial with both conventional and organic (Organic
Materials Review Institute-certified) insecticides to
determine how insecticides with a 24-hour pre harvest
interval perform to control asparagus beetle adults and
egg laying during harvest on spears. We did the spray
trial in a research plot in Hart, Michigan, with eight
insecticides applied by overhead spraying (Table 1). We
released asparagus beetles into the experimental plot
and counted numbers of beetles and eggs 24 hours
later. The best performing synthetic insecticides were
carbaryl, Coragen (chlorantraniliprole) and the best
organic insecticide was Entrust (spinosad). Two organic
insecticides (Permethrin, Neem) did not perform well
compared to the other insecticides. We did not find any
beetles or eggs in the other plots, so it is difficult to know
how these performed relative to the other treatments.
While asparagus harvest ends in June, asparagus
beetle activity continues throughout the summer. Foliar
spraying of the fern should occur when 10% of plants are
defoliated, or 50% of the plants have larvae. Because
asparagus is a perennial vegetable crop, understanding
the impacts of effective beetle management is
important to create sustainable methods. Future studies
investigating management methods for asparagus
beetles is necessary, no matter the season.
VEGETABLEGROWERSNEWS.COM | 21

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January 2023

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