ENTM 340 Insect Pests of Trees Turf and Ornamentals�

C. Sadof� Purdue University

 

Laboratory 9.� Defoliating Insects

 

 

1. Field Tour:

 

2.      Gypsy� Moth Distinguish a gypsy moth from other early season defoliating insects.� Be sure to note coloration, and presence of webs in your description.�

 

Eastern� tent caterpillar

 

 

Forest tent caterpillar

 

 

Gypsy moth

 

 

3.� The concealed caterpillars Eastern Tent, Mimosa Webworm, Fall Webworm, Bagworm

Complete this table:

 

����������� ����������� ����������� Eastern Tent � �����Fall Webworm������� Mimosa Webworm���� Bagworm

����������������������� ����������� Caterpillar������������������������������

Webs,

Folded Leaves,

or pine cone like

 

Position of webs�����������

on tree

 

Location and stage of

overwintering insect

 

Location of caterpillar

relative to web or bag

when feeding

 

Primary host����

 

Generations/yr

 

Dispersing stage�����������������������������������

 

 

4. Distinguish between caterpillar and �sawfly larvae

 

a. 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?

 

 

b. 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?

 

 

 

Why are European pine sawflies so difficult to detect in the spring?

 

 

 

 

What is the straw stage of European pine sawfly injury?

 

5. Types of defoliation are critical for helping identify a defoliator.�

Diagram each type of defoliation

 

Skeletonization������������������������������������������������������������ Complete defoliation

 

 

 

 

Root weevil notching���������������������������������������������������������������� Leaf cutter bee

(Larval root feeding is more damaging)

 

 

 

Slug feeding on Hosta

 

 

 

6. Distinguish among the following �beetles.

Principle hosts����������� Principle Adult Markings����������������� Larval Characteristics

 

Japanese beetle

 

Rose Chafer

 

Elm leaf beetle

 

Black vine weevil

 

Lady beetle

 

 

7. Distinguish among the following caterpillars.

Principle hosts����������������������� How hairy?���� ����������� Produces webs?��������� Principle markings

�����������

White marked tussock moth

 

Yellownecked caterpillar

 

Walnut caterpillar

 

Eastern tent caterpillar

 

Forest tent caterpillar

 

Fall webworm

 

Mimosa webworm

 

Catalpa worm

 

Orange striped oakworm

 

Mourning cloak caterpillar

 

 

 

 

8. Distinguish among the following defoliating sawflies.

Principle hosts����������������������� How hairy?���������������� Produces webs?��������� Principle markings

 

European pine sawfly

 

White pine sawfly

 

Red headed pine sawfly

 

Introduced pine sawfly

 

Hollyhock sawfly