Important Considerations
- Check The Cucurbit Downy Mildew Forecast Homepage for development and spread of downy mildew. Spray the field when the disease is in locations near the field with chlorothalonil (i.e., Bravo Weather Stik). Spray the field with Orondis Opti or Revus plus chlorothalonil when the disease starts developing in a field.
- Spray for powdery mildew at first sign of the disease (check inside the canopy). Usually, symptoms on the upper leaf surfaces signal an outbreak.
- If there is a Phytophthora problem, treat the seed with Apron XL LS (0.64 oz/100 lb seed) and spray the plants with fungicides mentioned in the “Schedule IV” on the following page.
- For bacterial spot, apply Actigard twice after seedling emergence, then begin spraying plants at vine spread with Manzate PRO Stick + Kocide-3000 alternated with Regalia + Kocide-3000.
- Use 50 gallons of water per acre with ground sprayers, 5 gallons of water with air application. Make sure to have thorough coverage of plants.
- Always check the labels for the updates.
Table 1. Registered fungicides and application rates for managing pumpkin diseases
Table 2. Restricted entry, pre-harvest interval, and mode of action for registered fungicides in pumpkins
Commercial Name of Registered Fungicides |
Common Name of Registered Fungicides | Restricted Entry Interval in Hours | Pre-Harvest Interval in Days | Mode of Action listed by FRAC Code |
|---|---|---|---|---|
| Apron XL LS | mefenoxam | --- | --- | 4 |
| Bravo (i.e. B.W.S. 6F) | chlorothalonil | 12 | 0 | M5 |
| Cabrio 20EC | pyraclostrobin | 12 | 0 | 11 |
| Copper (i.e.Kocide) | copper | 48 | 0 | M1 |
| Elumin 4SC | ethaboxam | 12 | 2 | 22 |
| Fontelis 1.67SC | penthiopyrad | 12 | 1 | 7 |
| Forum 4.16SC | dimethomorph | 12 | 0 | 40 |
| Gatten 0.42SC | flutianil | 12 | 0 | U13 |
| Gavel 75DF | mancozeb + zoxamide | 24 | 5 | M, 22 |
| Inspire Super | difenoconazole + cyprodinil | 12 | 7 | 3, 9 |
| Manzate PRO Stick | mancozeb | 24 | 5 | M3 |
| Microthiol 80DF | sulfur | 24 | 0 | M2 |
| Omega 500F | fluazinam | 12 | 7 | 29 |
| Orondis Gold 200 | oxathiapiprolin | 4 | 0 | 49 |
| Orondis Opti | chlorothalonil + oxathiapiprolin | 12 | 0 | M5, 49 |
| Orondis Ultra | mandipropamid + oxathiapiprolin | 12 | 0 | 40, 49 |
| Presidio 4SC | fluopicolide | 12 | 2 | 43 |
| Previcur Flex 66F | propamocarb | 12 | 2 | 28 |
| Pristine 38WG | pyraclostrobin + boscalid | 12 | 0 | 11 + 7 |
| Procure 480SC | triflumizole | 12 | 0 | 3 |
| ProPhyt, Reliant, … | potassium phosphite | 4 | 0 | P07 |
| Quadris 2.08SC | azoxystrobin | 4 | 1 | 11 |
| Quadris Opti | azoxystrobin + chlorothalonil | 12 | 1 | 11, M |
| Quintec 2.08SC | quinoxyfen | 12 | 3 | 13 |
| Rally 40W | myclobutanil | 24 | 0 | 3 |
| Ranman 400SC | cyazofamid | 12 | 0 | 21 |
| Reason 500SC | fenamidone | 12 | 14 | 11 |
| Regalia 12 Biofungicide | plant extract | 4 | 0 | P5 |
| Revus 2.09SC | mandipropamid | 12 | 0 | 40 |
| Rhyme 2.08SC | Flutriafol | 12 | 0 | 3 |
| Sovran 50WG | kresoxim-methyl | 12 | 0 | 11 |
| Tanos 50WDG | famoxadone + cymoxanil | 12 | 3 | 11,27 |
| Topsin-M 70WP | thiophanate methyl | 12 | 0 | 1 |
| Topsin 4.5FL | thiophanate methyl | 12 |
|
|
| Torino 0.85SC | cyflufenamid | 4 | 0 | U6 |
| Zampro 525F | dimethomorph + ametoctradin | 12 | 0 | 40, 45 |
| Zing 4.9 SC | zoxamide + chlorothalonil | 12 | 0 | 22, M5 |
* Re-Entry Interval (hours)
** Pre-Harvest Interval (Time from the last application to harvest)
*** MOA: Mode of action. FRAC: Each number and/or letter indicates a separate mode of action.
Suggested Spray Schedules in Commercial Pumpkin Fields in Illinois
Schedule I. For control of only powdery mildew (7- to 10-day interval)
| Week 1 | Week 2 | Week 3 | Week 4 | Week 5 |
|---|---|---|---|---|
| Quintec | Inspire Super or Procure | Quintec | Inspire Super or Procure | Quintec |
* Start spray applications at the first sign of powdery mildew inside the canopy (on vines or lower surfaces of leaves). The first spray in central Illinois is usually during the last week of July or the first week of August. Microthiol Disperss (sulfur) can also be used for control of powdery mildew.
Schedule II. Full-season spray schedule (weekly intervals) for management of powdery mildew and bacterial spot.
Begin application for managing bacterial spot at vine spread.
Week of Spray | ||||||||
|---|---|---|---|---|---|---|---|---|
1 (Fruit set) | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Copper + Manzate PRO Stick
| Copper + Regalia | Copper + Manzate PRO Stick
| Copper + Regalia
| Inspire Super* + Copper + Manzate PRO Stick | Quintec + Copper + Regalia | Inspire Super* + Copper + Manzate PRO Stick | Quintec + Copper + Regalia | Inspire Super* + Copper + Manzate PRO Stick |
* Instead of Inspire Super, Procure can be used.
Schedule III. For management of powdery mildew and downy mildew (if downy mildew is reported in the area). Spray at weekly intervals.
In Illinois, downy mildew usually occurs after July 15.
Week of Spray | |||||
|---|---|---|---|---|---|
1* | 2** | 3 | 4 | 5 | 6 |
Orondis Opti
| Quintec + Ranman + Bravo Weather Stik | Inspire Super + Revus + Bravo Weather Stik | Quintec + Orondis Opti
| Inspire Super + Ranman + Bravo Weather Stik | Quintec + Revus + Bravo Weather Stik |
* Start spray applications at the first report (or sign) of downy mildew.
** Start spray applications at the first sign of powdery mildew or downy mildew.
Schedule IV. For management of Phytophthora blight (also management of downy mildew). Spray at weekly intervals.
In Illinois, Phytophthora vine and fruit infection can occur any time during the season.
Week of Spray* | |||||||
|---|---|---|---|---|---|---|---|
1** | 2 | 3 | 4 | 5 | 6 | 7 | |
Orondis Ultra + ProPhyt*** | Ranman + Silwet L-77 | Revus + ProPhyt | Orondis Ultra + ProPhyt | Ranman + Silwet L-77 | Revus + ProPhyt | Ranman + Silwet L-77 | |
Revus + ProPhyt | Orondis Ultra + ProPhyt | Ranman + Silwet L-77 | Revus + ProPhyt | Ranman + Silwet L-77 | Revus + ProPhyt | Orondis Ultra + ProPhyt | |
* Follow the recommendation provided in either the first row or the second row in the table.
** Start spray applications at the first sign of Phytophthora infection or downy mildew.
*** Other phosphonates (i.e., Reliant) can be used instead of ProPhyt.