ENTM307E� Worksheet 8.� Insect Defoliators��� ��������������������������� Name_______________
Defoliation� Identification
1.� Draw defoliation types
Skeletonization�������������������������������������������������������������������������������������������������������������������� Complete
defoliation
Root weevil
notching��������������������������������������������������������������������������������������������������������� Leaf
cutter bee
How does injury
from a root weevil and a leaf cutter bee differ in regards to plant health?
2. Distinguish
between a generalist and a specialist defoliator.
3. �Which of these insects are generalists? Which are
specialists?� Consult Johnson and Lyons
and look up the number of plant species that each of these insects feed upon.
Skeletonizers������������������������������������� Defoliators
Japanese beetle����������������������������������� Dogwood
Sawfly
Elm leaf beetle�������������������������������������� Orange
striped oakworm
Cottonwood leaf
beetle���������������������� Red humped
caterpillar
Willow leaf
beetle������������������������������� Yellow
necked caterpillar
Rose chafer������������������������������������������ Walnut
caterpillar
Pear slug ���������������������������������������������� Mourning
cloak caterpillar
Rose slug��������������������������������������������� Gypsy
Moth
Dogwood sawfly
European pine
sawfly
Red headed pine
sawfly
White pine
sawfly
Garden slugs
Oak leaf
skeletonizer
Yellow poplar
weevil
Larval
identification
4.� Diagram a side view of a yellow necked
caterpillar larvae and identify the following:
Head, thorax,
abdomen, true legs, prolegs.� Then,
diagram a ventral view of a caterpillar proleg. Identify crochets.
On which
segments beyond the thorax are prolegs present?
5. Diagram a
side view of a European pine sawfly larvae and identify the following: Head,
thorax, abdomen, true legs, prolegs.��
Then diagram a ventral view of a sawfly�
proleg.�� Are crochets present?
On which
segments beyond the thorax are prolegs present?
From the
standpoint of using Bacillus thuringiensis, why is it important to
distinguish between a caterpillar and sawfly larva?
What is the
straw stage of injury and what does it look like?� Why is it so difficult to detect?
What does this
sawfly injury look like in July?��
6.�
Examine the pear slug sawfly injury specimen.�� What does the larvae look like?�
See photo on web page.
7.
Draw a grub
of an elm leaf� beetle.� Draw and adult elm leaf beetle
Identify head
thorax abdomen for each.
Are prolegs
present?� Where do adults feed?�� _____________�������������� Where do larvae feed? ____________���� Where are eggs laid?_______��� Where do you target control?
8. Draw� a Japanese beetle adult.� Identify elytra, pronotum, white fringes on
abdomen.
Which of these
three characters are used to distinguish this insect from a false Japanese
beetle.� Why is this important?
At what time of
year do adult Japanese beetles feed?� On
what kinds of plants?��
When and where
do Japanese beetle larvae feed?
Why shouldn't
you use Japanese beetle traps in Indiana?
Are there any
crabapples that are resistant to Japanese Beetle?
Refer to E-75 to
generate a list of crabapples you may want to plant.
9.� Draw an adult black vine weevil.
At what time of
day do adults feed?��� �������������������������������������������� When
do they start feeding?
When do adults
start to lay eggs?������ Where do grubs
feed?
How can you
control adults with a pesticide? (time of year, location of spray)
How can you
control grubs with a pesticide? ( time of year, location of spray?)
What are some
tips for controlling this pest with entomophagous nematodes?