ENTM307E� Worksheet 7.�� Defoliators� and Gypsy
Moth (I)�� �������������� Name_______________
Eastern
Tent Caterpillar
Diagram
the typical location of ������������� Diagram
an eastern tent caterpillar, and its egg mass an eastern tent caterpillar web
on at tree.����������������������������������������� ����������������������������������� on a twig.
Draw
an eastern tent caterpillar and a forest tent caterpillar with sufficient
detail to distinguish the two.
How
many generations does an eastern tent caterpillar have per year?
On
what kinds of trees does eastern tent caterpillar feed?
At
what time of day does it feed, and where does feeding take place in relation to
the nest?
How
does this relate to control of this pest?
What
would you look for in the winter to control this pest?
Mimosa
Webworm
Diagram
the typical location of ������������������������������������������������� Diagram
a close up of the web, and a larva.
�a mimosa webworm on at tree.������������������������������������������������
Draw
the caterpillar in sufficient detail to identify.�����
Where
does the webworm spend the winter and what does it look like at this stage?
How
many generations does a mimosa webworm have per year?
On
what� kinds of trees does mimosa webworm
feed?
How
would you plan for managing this pest in the landscape if you were a:
a.
designer
b.� landscape manager�
Diagram
the typical location of a ���������������������������������������������� Diagram
a fall webworm and its egg webworm nest on at tree.��������������������������������������� ����������� mass on a leaf.
How
many generations does a fall webworm have per year?
On
what kinds of trees does it feed?
Where
does it feed in relation to the web, and at what time of day?
At
what time of year are webs most abundant?
What
kinds of mechanical controls would be best for this pest, and when would they
be most effective?
What
would contribute to your decision to spray an insecticide against this pest in
the fall?
What
would contribute to your decision NOT to spray and insecticide against this
pest in the fall?
Bagworm
Draw
a bagworm.
Why
is it difficult to detect this pest early in the season?
If
the females do not fly, then how do bagworms move between plants?
Where
and at what stage does this pest winter?�
�How does this relate to the feasibility of
mechanical control of this a light infestation(< 5 bags per tree) of this
pest.� What about a heavy infestation?
Leaf
crumpler Acrobasis indignella
What
is the preferred host of this plant?
How
does it spend the winter?��
When
do moths lay eggs in summer?
When
does the caterpillar stage do damage?��
�Consider the biology of this
caterpillar.� How feasible is mechanical
control during April and July?
II.
General Information about group.
When
is Bacillus thuringiensis most effective for this group of pests?� What pesticides can be used later in the
season?
What
is the relative importance of early, mid- and late season defoliation to tree
health, and why?� How does this relate
to making pest management decisions?
What
are entomophagous nematodes and how can they be used for this group of pests?
III.� Gypsy Moth
See
Indiana Gypsy Moth Education Home Page
For
more information
<http://www.entm.purdue.edu/entomology/ext/Moth/index.htm>
1.
Which plants are most preferred by Gypsy Moth?
2.� Which plants are less preferred by Gypsy
Moth?
3.� What part of Indiana is considered part of
the area generally infested with gypsy moth?
4.� How is Gypsy moth monitored in IN?
5.� How does pheromone trap catch and egg mass
surveys differ with respect to gypsy moth activity in a given area?
6.
How does the European Gypsy moth move to new trees in nature and with the aid
of humans?
7.� What is the slow the spread program?
8.� If gypsy moth is such a serious defoliator,
why are trees still standing in Massachussetts, over 140 years after the
introduction of this pest?
9.� Contrast management strategies for the gypsy
moth in the urban and natural forest. Be sure to define your management
objectives in each of the two situations.