Soybean Aphid Soybean Aphid

Soybean Aphid

    Soybean aphid is increasing as a risk, but has not been a significant pest since it's introduction. It is likely to be a significant pest only on late maturing beans.


NEW FOR 2005
Treat if: the aphid population reaches an average of 250 aphids per plant in the V (vegetative) through R5 (beginning seed) stages, as calculated using a 30 plant per field, sample. Application at R6 (full seed) may, but is not likely, to have an economically positive effect. Application after R6 in not warranted.

Research continues on the soybean aphid. For the most current information, go to

Foliar Treatments for Soybean Aphids

  Insecticide     Rate per Acre     Days to Harvest/Forage  
Dimethoate 4E (MicroFlo Only)
1 pt
5 (Feed or graze)
3.0 to 4.3 fl oz
21(Grain) Do not feed or graze livestock
Lorsban 4E
1 to 2 pts.
28(Grain) Do not feed or graze livestock
Mustang Max
2.8 to 4.0 fl oz
21(Grain) Do not feed or graze livestock
Penncap M
1 to 3 fl. oz.
20 (Harvest or grazing)
1.92 to 3.2 fl oz
45 (Grain) Do not feed or graze livestock

2(ee) Recommendations for Soybean Aphid on soybean in Kentucky

The following companies have issued 2(ee) recommendations for their products for use against soybean aphid in Kentucky grown soybeans. This means that the current federal product labels do not list the soybean aphid use. However, by issuing the 2(ee) the company is adding this recommendation to their label. Applicators are warned that they must have a copy of the 2(ee) recommendation document "in hand", in addition to the current federal label. All restrictions on the federal label apply.

Rate of Application
Days to Harvest
Bayer CropScience
Baythroid 2
2.0 - 2.8 fl. oz/A
45 (Grain & feeding dry vines)
15 (Green forage)
1 to 2 pt.
28 (Grain) Do not feed or graze livestock

For current information, see the Kentucky Pest News.