Tobacco Insect Scouting Report. July 3, 2014
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Collapse ▲We are in our tenth week of scouting, and tobacco budworms are still active at most sites. Although, fewer sites exceed thresholds. Some fields are starting to flower, and these flowers are particularly attractive to budworm moths. Moths will preferentially lay eggs on flower buds or flowers, and larvae hatching from these eggs rarely move down the plant to feed on leaves. Therefore, we generally do not recommend treating fields for tobacco budworm which are within 1 to 2 weeks of topping.
Within the next couple of weeks, some sites are going to begin topping which will reduce the impact of the budworms. Tomato spotted wilt virus incidence remains well below 10%, the level at which economic loss may occur.
Scouting Report, Eastern 1 – Grower Standard Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No treatment | 0 beetles/plant – No treatment | 12% tobacco budworm budworm infested plants – Treatment Not Recommended** | 0 – No treatment | 0 – No treatment | None observed |
Scouting Report, Eastern 2 – IPM Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 beetles/plant – No treatment | 10% tobacco budworm infested plants – Treatment Not Recommended | 0 hornworms/plant – No treatment | 0 – No Treatment | None Observed |
**Although the tobacco budworm infestation is over threshold, treatment is not recommended due to the likelihood of topping within the next week. Budworms larvae are relatively small and closest to flowers, which will be removed during topping.
Scouting Report , Eastern 3 – Grower Standard Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No treatment | 0 beetles/plant – No treatment | 11% tobacco budworm budworm infested plants – Treatment Recommended | 0 – No treatment | 0 – No treatment |
0.025 stink bugs per plant 0.025 Japanese beetles per plant |
Scouting Report, Eastern 4 – IPM Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 beetles/plant – No treatment | 8% tobacco budworm infested plants – No treatment | 0 hornworms/plant – No treatment | 0 – No Treatment | 0.025 Japanese beetles per plant |
Scouting Report Piedmont 1 – Grower Standard Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No treatment | 0 – No treatment | 30% tobacco budworm infested plants – Treatment Recommended | 0 – No treatment | 0 – No treatment | 0.025 stink bugs per plant |
Scouting Report, Piedmont 2 – IPM Field
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infested plants | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 – No treatment | 50% tobacco budworm infested plants – Treatment Recommended | 0 – No treatment | 0 – No Treatment | None observed |
Here are the scouting reports from the control plots for our experiments at the Upper Coastal Plain Research Station near Rocky Mount, NC and the Lower Coastal Plain Research Station near Kinston, NC. For some of these experiments, the control plots receive no insecticide treatments for the entire season. For some of the experiments, we are interested in only caterpillar pests so all plants in the experiment, including the control plots, are treated in the greenhouse with imidacloprid to prevent other early season pests.
On Station, Kinston – Control plants with no insecticide treatment
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infestation | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 7% aphid infested plants – No Treatment | 0 beetles/plant – No treatment | 51% budworm infested plants – No treatment** | 0 – No treatment | 0 – No Treatment | 5% of plants infected with Tomato spotted wilt virus |
On Station, Kinston – Control plants treated with imidacloprid
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infestation | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 beetles/plant – No treatment | 56% budworm infested plants – No treatment** | 0 – No treatment | 0 – No Treatment | 5% of plants infected with TSWV |
On Station, Rocky Mount – Control plants with no insecticide treatment
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infestation | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 beetles/plant – No treatment | 9% budworm infested plants – No treatment | 0% Hornworm infested plants – No treatment | 0 – No Treatment | 1% of plants infected with TSWV |
On Station, Rocky Mount – Control plants treated with imidacloprid
| Insect observation | No. aphid infested plants | Flea beetles/plant | Percent tobacco budworm infestation | Hornworms/plant | Percent cutworm damaged plants | Other insects |
| Treatment needed? | 0 – No Treatment | 0 – No treatment | 9% budworm infested plants – No treatment | 0 – No treatment | 0 – No Treatment | 1% of plants infected with TSWV |
** Plots were not treated due to ongoing experiments, but experimental plots with similar amounts of budworm infestation, were treated.
More Information
View last week’s scouting report. To learn more about the Integrated Pest Management project, refer to our first scouting report.