Damage: Beet leafhoppers (BLHs) are important pests of potato because they can transmit a phytoplasma (BLTVA) that causes purple top disease. Since BLHs are transient, or pass-through pests of potatoes, they may be gone by the time you see purple top symptoms. So, it is important to monitor BLHs as their populations develop and move through the region.
Control: BLH numbers usually peak in June. Insecticides targeting BLHs are usually applied May to June, and sometimes July. They are not usually warranted later in the season regardless of BLH numbers.
| Stage of Development: Planting to Pre-emergence | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Platinum 75 SG thiamethoxam | 4A | G | 1.66-2.67 oz | 12 h | It should provide some early season control, but it may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top) when BLH numbers are high. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. | |
| Admire Pro (soil application) imidacloprid | 4A | G | 5.7-8.7 fl oz | 12 h | Should provide some early season control, but it may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top disease) when BLH numbers are high. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. | |
| Belay (soil application) clothianidin | 4A | G | 9-12 fl oz | 12 h | Should provide some early season control, but it may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top disease) when BLH numbers are high. | |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Emergence to Row Closure | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Vydate C-LV oxamyl | 1A | G | 1.1-2.1 pt | 48 h | 7 d | Apply when BLH populations are increasing. Re-treat after 14-days to maintain control of migrating BLHs. Making 3-4 applications late May to early July has been observed to control BLHs and prevent transmission of purple top disease. Later applications are not usually warranted. |
| Admire Pro (foliar) imidacloprid | 4A | G-F | 1.3 fl oz | 12 h | 7 d | Apply to foliage when BLHs are present to minimize spread of phytoplasma diseases (e.g., purple top). |
| Lannate LV methomyl | 1A | P | 1.5-3.0 pt | 48 h | 6 d | It will control BLHs on contact but is not recommended for this pest because it provides only 5-7 days of residual control. Products with longer residual activity are more cost-effective for maintaining control of BLH during their migration periods and limiting spread of phytoplasma diseases (e.g., purple top). |
| Transform WG sulfoxaflor | 4C | E | 1.5-2.25 oz | 24 h | 7 d | Early-to-mid season application will cover many migrating pests, including BLHs. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. |
| Asana XL esfenvalerate | 3 | G | 2.9-5.8 fl oz | 12 h | 7 d | Apply in May and/or early-to-mid June if BLH populations are building. |
| Baythroid XL beta-cyfluthrin | 3 | G | 0.8-1.6 fl oz | 12 h | 0 d | Apply in May and/or early-to-mid June if BLH populations are building. |
| Warrior II lambda-cyhalothrin | 3 | G | 0.96-1.6 fl oz | 24 h | 7 d | Apply in May and June to minimize spread of phytoplasma diseases (e.g., purple top) if BLH populations are building. |
| Mustang Maxx zeta-cypermethrin | 3 | G | 1.76-4.0 fl oz | 12 h | 1 d | Apply in May and/or early-to-mid June if BLH populations are building. |
| Dimethoate 400 EC dimethoate | 1B | P | 0.5-1.0 pt | 48 h | 0 d | It will control BLHs on contact but is not recommended because it provides only a few days of residual control. Products with longer residual activity are more cost-effective for maintaining control of BLH during their migration periods and limiting spread of phytoplasma diseases (e.g., purple top). |
| Imidan 70-W phosmet | 1B | P | 1.33 lb | 5 d | 7 d | It will control BLHs on contact but is not recommended for this pest because residues last only a few days. Products with longer residual activity are better for maintaining control of BLH during their migration periods and limiting spread of phytoplasma diseases (e.g., purple top). |
| Sivanto 200 SL flupyradifurone | 4D | E | 7-10.5 fl oz | 4 h | 7 d | Early-to-mid season application will cover many migrating pests, including BLHs. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. |
| Assail 70WP acetamiprid | 4A | E | 0.6-1.7 oz | 12 h | 7 d | Apply when BLHs are present to minimize spread of phytoplasma diseases (e.g., purple top). Retreat after 7-10 days to maintain control of incoming BLHs. |
| Actara thiamethoxam | 4A | E | 1.5-3 oz | 12 h | 14 d | Apply when BLHs are present to minimize spread of phytoplasma diseases (e.g., purple top). |
| Leverage 360 beta-cyfluthrin, imidacloprid | 3, 4 | G | 2.8 fl oz | 12 h | 7 d | Apply in May and/or early-to-mid June if BLH populations are building. |
| Brigadier bifenthrin, imidacloprid | 3, 4A | G | 3.8-6.14 fl oz | 12 h | 21 d | Apply in May and June to minimize spread of phytoplasma diseases (e.g., purple top) if BLH populations are building. |
| Aza-Direct azadirachtin | NC | ND | 1-3.5 pt | 4 h | 0 d | Apply when leafhoppers first appear. It may work too slowly to limit spread of phytoplasma diseases (e.g., purple top). |
| Neemix 4.5 IGR azadirachtin | NC | ND | 7-16 fl oz | 4 h | 0 d | Apply when beet leafhoppers first appear. It may work too slowly to limit spread of phytoplasma diseases (e.g., purple top). |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Tuber Bulking | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Transform WG sulfoxaflor | 4C | E | 1.5-2.25 oz | 24 h | 7 d | Early-to-mid season application will cover many migrating pests, including BLHs. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. |
| Sivanto 200 SL flupyradifurone | 4D | E | 7-10.5 fl oz | 4 h | 7 d | Early-to-mid season application will cover many migrating pests, including BLHs. Watch the Contour Maps in the Potato DAS every week to monitor regional BLH population densities. |
| Assail 70WP acetamiprid | 4A | E | 0.6-1.7 oz | 12 h | 7 d | Apply when BLHs are present to minimize spread of phytoplasma diseases (e.g., purple top). Retreat after 7-10 days to maintain control of incoming BLHs. |
| Actara thiamethoxam | 4A | E | 1.5-3 oz | 12 h | 14 d | Apply when BLHs are present to minimize spread of phytoplasma diseases (e.g., purple top). |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Preplant | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Cruiser Maxx Potato Insecticide and Fungicide thiamethoxam + fludioxonil | 4A; 12 | G | See Label | 12 h | Should provide some early season control. It may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top disease) when BLH numbers are high. | |
| Admire Pro (seed treatment) imidacloprid | 4A | G | See Label | Should provide some early season control, but it may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top disease) when BLH numbers are high. Apply at 0.17-0.35 fl oz/100 lb seed. | ||
| Belay (seed treatment) clothianidin | 4A | G | See Label | Should provide some early season control, but it may work too slowly to prevent rapid spread of phytoplasma diseases (e.g., purple top disease) when BLH numbers are high. Apply at 0.4-0.6 fl oz/100 lb seed. | ||
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
