Green Bug (Kansas Sorghum)

Scouting time

Frequent observations are needed to make accurate treatment decisions. The scouting table below is based on average number of greenbugs per plant.

Sampling method

Plant growth stage

Threatening level

Treatment level

Based on visual rating

0-1 leaf



Colonies or numerous winged adults present of majority of plants. May be risky to wait until visible damage obvious.

3 leaf



As above, before general signs of stress occur. Light to threatening levels often decline naturally.

5 leaf



When majority of plants are infested with rapidly increasing colonies of greenbugs and initial signs of reddening appear.

mid-whorl stage, about one month after emergence



When majority of plants are infested with rapidly increasing colonies, but before leaves begin to die. Damaging levels uncommon at this stage, but beginning infestations are often starting to appear.

late whorl through soft dough stages



Some lower leaves beginning to become wet and sticky with honeydew. Some leaves yellowing and reddening with occasional leaves drying. Small to large colonies present and increasing on the majority of plants.



See above table.

Chemical control

Greenbug Management Options



Alpha-cypermethrin (Fastac EC)

 0.02 to 0.025 lb. a.i./acre (3.2 to 3.9 fl. oz./acre)

Chlorpyrifos (numerous products)

Check label, but generally 0.5 to 2 pints/acre

Chlorpyrifos plus gamma-cyhalothrin (Cobalt Advanced)

 11.0 to 38.0 fl. oz./acre

Chlorpyrifos plus zeta-cypermethrin (Stallion)

 9.25 to 11.75 fl. oz./acre

Dimethoate (Dimethoate or Dimate)

 0.25 to 0.5 lb. a.i./acre


 57 1.5 pints/acre

Methidathion (Supracide 2E)

 Section 24(C), 2 pints/acre


Non-chemical controls

Resistant hybrids can be a useful way of reducing greenbug damage. Currently, hybrids with resistance to biotypes I and K offer the best protection. While resistant hybrids are not a perfect or complete solution, they delay greenbug development and reproduction, allowing natural enemies more time to respond, and should be considered for a portion of the acreage in areas prone to greenbug infestations. Check with local seed suppliers for greenbug resistant hybrids adapted to your area.

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