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Japanese Beetle
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Information on this page is derived from public domain documents published
by the federal government of canada, the provincial government of British
Columbia and information contributed on electronic discussion groups.
Please bear in mind that any pesticides mentioned in these pages may
no longer be recommended or registered for the indicated use — check
with your local pesticide officer or regional agrologist for current info
(you can use the provincial directory
on the internet to search for those job titles or call Enquiry
bc at 1 800 663-7867 for assistance). It is recommended that you use
a search engine using the common name and/or scientific name of the organism(s)
below, together with the name of your province, to find biology and management
information relevant to your local conditions.
If
you choose to use chemical controls remember to
always follow pesticide label instructions!
insects
of economic importance in Canada and British Columbia
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family: scarabaeidae
species: popillia japonica
common names: japanese beetle
hosts:
notes: larvae feed on the roots of grasses til
the end of October; in spring they pupate and emerge as adults
around the fourth of July. B. popilliae was first found
in 1930s; the bacillus causes a true bactericemia since it has
no endo or exotoxins; disease organism seems to have developed
from native grub to attack Japanese beetle.
Milkiness is due to bactericemia; bacillus has a sporangium. Bacteria
may be encapsulated by midgut cells; bacterial rods can penetrate
directly to the hemocoel.
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Agriculture and Agri-Food Canada Insect Identification
Sheet No. 90 1983
Japanese Beetle
Papilla japonica Newsman
The Japanese beetle was accidentally imported to New Jersey
in 1916 and has since spread over a large area of eastern
North America. It moved into the Niagara Peninsula in 1940
where it is now a serious pest. There are also several isolated
infestations in urban areas of eastern Ontario and Quebec.
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Injury:
Adults cause damage by feeding on the leaves and
flowers of numerous plants including ornamental shrubs, fruit trees,
corn, asparagus and even rhubarb. They also feed on any available
ripe fruits. The larvae, known as white grubs, damage many plants
and lawns by feeding on the roots.
Life Cycle:
The
adult beetles are present for 30 to 40 days from early July.
They are most active on warm sunny days, between 9 a.m. and 3p.m.,
when they congregate on a variety of plants. During this time,
females periodically go to the ground to lay eggs. These hatch
in a few days and the grubs develop during the following 10 months,
feeding on the roots of a wide variety of garden and field crops,
ornamental plants and lawns. In late spring or early summer,
mature larvae enter the pupal stage which lasts about 2 weeks.
The adult beetles, about 1 cm long, are a distinct metallic green
and bronze. They have two small tufts of hair at the end of the
wing covers and five along each side.
Pest Management:
Contact
your provincial Department of Agriculture for control recommendations.
If only a few ornamental plants are involved, the beetles may
be shaken from the flowers into a container and
destroyed.
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