Laboratory Exercise 4.� Agents of Leaf Distortion and Discoloration

 

 

ENTM 307E�������� Name _______________________________________

 

A. Potato Leaf Hopper.

 

Draw a leaf hopper, and the diagnostic symptoms of injury on red maple.

 

 

 

 

 

 

 

Describe the injury to red maple and how that injury is caused.

 

 

 

 

Where do these hoppers spend the winter?

 

 

What is the action threshold in the landscape and what insecticides could you apply?

 

 

 

 

 

2.� Honey Locust Plant Bug

 

Draw a honeylocust plant bug and the diagnostic symptoms of injury.

 

 

 

 

 

 

 

Describe the injury to honey locust and how that injury is caused.

 

 

 

What is the action threshold in the landscape, and what insecticides could you apply?

 

 

How does management of this pest impact later season pests on honeylocust?

 

3.�� Lacebug

Draw an adult, a nymph and the diagnostic symptoms of injury.

 

 

 

 

 

 

Describe injury and how it is caused. How would you distinguish it from spider mite injury?

 

 

 

 

 

What factors promote outbreaks in the landscape?

 

 

 

How would you control this pest?

 

 

 

 

4. Spider Mite

 

Draw a spider mite.

 

 

 

 

 

 

 

 

Draw any natural enemies that you find.� Please note that these are usually fast moving, or they may be in the larval stage on an infested leaf.��

 

 

 

Describe injury and how it is caused.� How would you distinguish it from lacebug injury?

 

 

 

 

Distinguish between cool and warm season mites?

 

 

 

 

 

What factors promote outbreaks of each?

 

 

 

What natural enemies should you look for in the field when scouting for mites?

 

What are some rules of thumb for making decisions about controlling this pest?

 

 

 

 

 

 

 

Draw damage specimens of the following laboratory specimens

 

 

Eastern Ash Plant bug

 

 

 

 

 

 

Four lined plant bug

 

 

 

 

 

 

Rust mites

 

 

 

 

 

 

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