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Vol. 17, No. 10
Article 2 of 10
May 25, 2007
Some Early Planted Soybean Fields Sprayed for Bean Leaf Beetle Control
By Wayne Bailey
High numbers of bean leaf beetle adults have required insecticide
applications to reduce numbers below economic threshold levels in some
early planted soybean fields. Adult bean leaf beetles migrating from
overwintering sites to early planted soybean fields have resulted in heavy
leaf feeding and some plant mortality. In many areas wet weather has
limited soybean planting and accumulated high numbers of beetles in
seedling soybean fields that are available. The bean leaf beetle produces
two generation annually in Missouri with larvae feeding on soybean roots.
The economic threshold for bean leaf beetle adult feeding on seedling
soybean is five or more beetles present per row foot or 1 or more plants
destroyed per row foot. In most years control of beetles causing early
season defoliation of soybean seedling is not needed. However the limited
number of soybean available early season has forced high numbers of beetles
into fields with seedling soybeans. Economic damage from bean leaf beetle
is more common later in the season when beetles of the second generation
feed on soybean pods.
| Recommended Insecticides for Management of Adult Bean Leaf Beetles in Soybean |
| Chemical name |
Common name |
Rate of Formulated Material |
Rate of Active Ingredient (a.i.) |
| Esfenvalerate |
*Asana XL |
5.8 to 9.6 fl oz/acre |
0.03 to 0.05 lb a.i./acre |
| Beta-cyfluthrin |
*Baythroid XL |
1.0 to1.6 fl oz/acre |
0.0078 to 0.0125 lbs a.i./acre |
| Dimethoate |
Dimethoate |
see specific label |
0.5 lb a.i./acre |
| Chlorpyrifos 4E |
*Lorsban 4E
*numerous products |
1 to 2 pts/acre
see specific labels |
0.5 to 1 lb a.i./acre
see specific labels |
| Thiodicarb |
*Larvin 3.2 EC |
see specific label |
0.45 to 0.75 lb a.i./acre |
| Zeta-cypermethrin
. |
*Mustang Max |
2.0 to 2.8 fl oz/acre |
0.0125 to 0.0175 lbs a.i./acre |
| Encapsualted Methyl Parathion |
*Penncap-M |
2 to 3 pts/acre |
0.5 to 0.75 lb a.i./acre |
| Permethrin |
*numerous products |
see specific label |
0.05 to 0.10 lbs a.i./acre |
| Gamma-cyhalothrin |
*Proaxis |
1.92 to 3.2 fl oz/acre |
0.0075 to 0.0125 lb a.i./acre |
| Acephate |
Orthene |
see specific label |
see specific label |
| Permethrin |
*numerous products |
see specific label |
0.05 to 0.10 lbs a.i./acre |
| Carbaryl |
Sevin 4F |
1 to 2 pts/acre |
0.5 to1.0 lb a.i./acre |
| Carbaryl |
Sevin XLR Plus |
1 to 2 pts/acre |
0.5 to 1.0 lb a.i./acre |
| Lambda-cyhalothrin |
*Warrior |
1.92 to 3.2 fl oz/acre |
0.015 to 0.025 lb a.i./acre |
| Lambda-cyhalothrin |
*Numerous products |
see speciic labels |
see specific labels |
| * Designated a restricted use product. Read and follow all label direction, precautions, and restrictions |
Wayne Bailey
BaileyW@missouri.edu
|
