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Table 4. Economic threshold levels for
greenbug on sorhgum at different plant growth stages. |
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| Plant size |
When to
treat |
| Emergence to
5 cm |
Twenty
percent of plants visibly damaged (plants beginning to yellow), with greenbugs on plants. |
| Larger plant
to boot |
Greenbug
colonies causing red spotting or yellowing of leaves and before any entire leaves on
twenty percent of plants are killed. |
| Boot to
heading |
At the death
of one functional leaf on twenty percent of plants. |
| Heading to
hard dough |
When
greenbug numbers are sufficient to cause death of two normal-sized leaves on twenty
percent of plants. |
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Department of Entomology | Texas A&M University |
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© 1999 Teetes and Pendleton. Unauthorized reproduction and distribution prohibited. |
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