Plant & Soil Sciences eLibraryPRO
Loading
control panel control panel
 

Corn Rootworm - Part 1: Description of Corn Rootworm and Other Early Season Corn Pests

Rate Me

Rating Corn Root Damage

Corn roots are rated for the amount of damage inflicted by corn rootworm larvae. This rating will assess the level of damage from mild to severe. There are two scales that can be used when rating root injury. The first scale is referred to as the traditional Iowa 1-6 scale. In this scale, one represents no damage to the roots and six corresponds to a root with three nodes of roots eaten (Table 1).

 

Table 1 - Iowa 1-6 Scale

 

Iowa Scale
Description
1
No damage to only a few feeding scars
2
Feeding scars but no roots eaten within 1.5 inches of stalk
3
Less than one node of roots eaten but not within 1.5 inches of stalk
4
One node or equivalent eaten within 1.5 inches of stalk
5
Two nodes or equivalent eaten within 1.5 inches of stalk
6
Three nodes or equivalent eaten within 1.5 inches of stalk

 

 The second scale is the Node-Injury scale (Table 2). This scale uses a range of zero to three, with zero representing no damage and three representing severe damage.

Table 2 - Node Injury Scale
Node Injury Scale
Description
0
No damage
1
One node or the equivalent of one node eaten within two inches of stalk
2
Two nodes eaten within two inches of stalk
3
Three nodes eaten within two inches of stalk
Note:  Damage can also be recorded as a percentage of a node removed, i.e. 1.75 = 1 ¾ nodes eaten.

For more information on these two scales and to view associated pictures of corn roots, see the Iowa State University Entomology interactive node-injury scale at http://www.ent.iastate.edu/pest/rootworm/nodeinjury/nodeinjury.html

 

Comments

Be the first to write a comment...

Control Panel cancel

Create activities for your moodle courses. Moodle Go to moodle
Select and group e-Library Lessons to create your own package... My Communities
Community Blogs Community Media

My Joined Communities

 
My Blogs - a journal of my thoughts... My Blogs
 
My Comments - my thoughts expressed as a feedback... My Comments
 
Classes that I am taking Registered Classes
Class Blogs Class Media
 
Check the scores of assesments that you have taken Taken Assessments
 
clear
Please confirm your selection.