Soybeans
Soybeans
Information related to the pathology and pest management of soybeans in Delaware.
Disease Management
Pest Management
Recommendations for pest management
Sampling Guidelines
| Pest | Sampling Method |
Growth Stage: Seedling to Pre-Bloom |
|
| Bean Leaf Beetle, Mexican Bean Beetle | Using a drop cloth placed between 2 rows, shake the plants in 6 foot row in 10 sites in a field, count the number of beetles found in 6 foot of row in each site, for Mexican bean beetle note the presence of pupae/eggs at each site, estimate defoliation at each site |
| Grasshoppers | Take 10 sweeps in 10 sites and count the number of adults and nymphs |
| Thrips | Examine 5 leaflets in 10 sites for the presence of thrips, check top and undersides of the leaves |
| Potato Leafhopper | Take 10 sweeps in 10 sites and count the number of adults and nymphs per 100 sweeps, sampling should be done when the foliage is dry |
| Growth Stage: Prebloom – Podset | |
| Japanese beetle, Green Cloverworm, Silver Spotted Skipper | Using a drop cloth placed between 2 rows, shake the plants in 6 foot of row in 10 sites in a field, count the number of insects found at each site and estimate defoliation |
| Spider Mites | Examine the underside of 5 leaflets in 10 sites for mites; also note the presence of mite eggs and note that amount of damage |
| Growth Stage: Podset – Maturity | |
| Spider Mites | 5 leaflets in 10 locations |
| Bean leaf beetle, Mexican bean beetle, Green cloverworm, Silver Spotted Skipper, Yellow Striped Armyworm, Beet Armyworm, Fall Armyworm | 6 foot of row in 10 sites using a drop cloth |
| Corn Earworm | 5 sweeps in 5 to 10 locations walking down the row |
Insect Thresholds
| Pest | Sampling Method |
Growth Stage: Seedling to Pre-Bloom |
|
| Bean Leaf Beetle, Mexican Bean Beetle | Using a drop cloth placed between 2 rows, shake the plants in 6 foot row in 10 sites in a field, count the number of beetles found in 6 foot of row in each site, for Mexican bean beetle note the presence of pupae/eggs at each site, estimate defoliation at each site |
| Grasshoppers | Take 10 sweeps in 10 sites and count the number of adults and nymphs |
| Thrips | Examine 5 leaflets in 10 sites for the presence of thrips, check top and undersides of the leaves |
| Potato Leafhopper | Take 10 sweeps in 10 sites and count the number of adults and nymphs per 100 sweeps, sampling should be done when the foliage is dry |
| Growth Stage: Prebloom – Podset | |
| Japanese beetle, Green Cloverworm, Silver Spotted Skipper | Using a drop cloth placed between 2 rows, shake the plants in 6 foot of row in 10 sites in a field, count the number of insects found at each site and estimate defoliation |
| Spider Mites | Examine the underside of 5 leaflets in 10 sites for mites; also note the presence of mite eggs and note that amount of damage |
| Growth Stage: Podset – Maturity | |
| Spider Mites | 5 leaflets in 10 locations |
| Bean leaf beetle, Mexican bean beetle, Green cloverworm, Silver Spotted Skipper, Yellow Striped Armyworm, Beet Armyworm, Fall Armyworm | 6 foot of row in 10 sites using a drop cloth |
| Corn Earworm | 5 sweeps in 5 to 10 locations walking down the row |
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