Pesticides for Fire Blight
Pear
| Stage of Development: Dormant | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha (190-380 L/acre). Remove cankers by March 31. See fire blight description. The higher rate for dormant sprays is more likely to be effective. | |
| Notes: Remove cankers from trees by March 31. | ||||||
Stage of Development: Dormant
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Dormant to Silver Tip | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| Copper hydroxide (Parasol) 25901 | M1 | 4.7 L | 1.9 L | 48 hrs | 2 days | Apply in sufficient water for complete coverage. Max. two applications per year. |
Stage of Development: Dormant to Silver Tip
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Blossom | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| kasugamycin (Kasumin) 30591 | 24 | 5.0 L | 2.0 L | 12 h | 90 | Apply at 20-30% bloom or when conditions favour disease development. Do not apply after petal fall. |
| streptomycin sulphate (Streptomycin 17) 10305 | 25 | 1.8 kg or 100 ppm (see notes) | 729 g or 100 ppm (see notes) | 24 h - 14 days | 30 | Apply at blossom stage if weather conditions favour blossom infection. Maximum 3 applications (5.4 kg/ha/season). 100 ppm rate (600 g of Streptomycin per 1000 L of water) is based on high volume spray. Use sufficient water volume for thorough blossom wetting. 14 day REI for thinning. |
| Aureobasidium pullulans (Blossom Protect) 30552 | NC | See label | See label | dry | n/a | Apply up to 4 times from 10-90% bloom if weather conditions favour blossom infection. |
| Bacillus subtilis (Serenade Opti) 31666 | 44 | 1.1-1.7 kg | 445-688 g | 24 h* | 0 | Suppression only. Apply at 1-5% blossom and repeat as needed during the blossom period. |
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha (190-380 L/acre). Repeat every 7-10 days as long as weather conditions favour disease development. See Fire blight description. | |
| Bacillus amyloliquefaciens (Double Nickel 55) 31888 | 44 | 1-1.5 kg | 405-607 g | 0 | Suppression only. Apply at blossom to end of flowering at 3- to 7-day intervals. Can be mixed with copper sprays. Can be applied post-bloom for shoot blight management. | |
| copper oxychloride (Copper Spray 19146) | M1 | 1.75 kg | 710 g | 48 h | n/a | Use on Bartletts only. See fire blight description. |
| copper oxychloride (Guardsman Copper Oxychloride 13245) | M1 | 1.75 kg | 710 g | 48 h | n/a | Use on Bartletts only. See fire blight description. |
| Notes: Warm weather followed by rain favours blossom infection. See description of fire blight for information on risk assessment based on temperature. | ||||||
Stage of Development: Blossom
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Summer | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| Notes: There are no products that can be applied to cure fire blight following infection. Preventative copper sprays may help to protect against new infections. Scout susceptible orchards for symptoms and prune out infected shoots, being careful to disinfect tools between cuts. See fire blight section for more information on cultural methods. | ||||||
Stage of Development: Summer
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Post-Harvest | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| Copper hydroxide (Parasol) 25901 | M1 | 4.7 L | 1.9 L | 48 hrs | 2 days | Apply after harvest with 50% leaf drop. Max. two applications per year. |
Stage of Development: Post-Harvest
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
Apple
| Stage of Development: Dormant to Silver Tip | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| copper oxychloride (Copper Spray 19146) | M1 | 4kg | 1.6kg | 48 h | n/a | Remove cankers by March 31. See fire blight description. |
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha (190-380 L/acre) as a dormant spray as buds begin to swell, repeating at the bud burst stage, and weekly thereafter as needed, up to six sprays. Remove cankers by March 31. See fire blight description. The higher rate for dormant sprays is more likely to be effective. | |
| Copper hydroxide (Parasol) 25901 | M1 | 4.7 L | 1.9 L | 48 hrs | 2 days | Apply in sufficient water for complete coverage. Max. two applications per year. |
Stage of Development: Dormant to Silver Tip
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Silver Tip to Green Tip | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| copper hydroxide (Kocide 2000-O) 33441 | M | 0.56-0.84 kg | 0.23-0.34 kg | 48 h | 2 days | Apply as a full cover spray for early season disease suppression. Use the higher rate when conditions favour disease progression. Moderate to severe crop injury may occur from late application; discontinue use when green-tip reaches 1/2 inch. Requires pesticide applicator certificate. |
Stage of Development: Silver Tip to Green Tip
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Blossom | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| kasugamycin (Kasumin) 30591 | 24 | 5.0 L | 2.0 L | 12 h | 90 | Apply at 20-30% bloom or when conditions favour disease development. Do not apply after petal fall. |
| streptomycin sulphate (Streptomycin 17) 10305 | 25 | 1.8 kg or 100 ppm (see notes) | 729 g or 100 ppm (see notes) | 24 h-14 days | 50 | Apply at blossom stage if weather conditions favour blossom infection. Maximum 3 applications (5.4 kg/ha/season). 100 ppm rate (600 g of Streptomycin per 1000 L of water) is based on high volume spray. Use sufficient water volume for thorough blossom wetting. 14 day REI for thinning. |
| Aureobasidium pullulans (Blossom Protect) 30552 | NC | See Label | See Label | dry | n/a | Apply up to 4 times from 10-90% bloom if weather conditions favour blossom infection. Do not tank mix with other fungicides. |
| Bacillus subtilis (Serenade Opti) 31666 | 44 | 1.1-1.7 kg | 445-688 g | 24 h* | 0 | Suppression only. Apply at 1-5% blossom and repeat as needed during the blossom period. |
| prohexadione calcium (Apogee) 28042 | n/a | 1350 g | 546 g | 12 h | 45 | For suppression of shoot blight, apply at 2.5 to 7.5 cm of new shoot growth. Will also reduce shoot growth. |
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha (190-380 L/acre). Repeat every 7-10 days as long as weather conditions favour disease development (maximum 6 sprays/season). See Fire blight description. | |
| Bacillus amyloliquefaciens (Double Nickel 55) 31888 | 44 | 1-1.5 kg | 405-607 g | 0 | Suppression only. Apply at blossom to end of flowering at 3- to 7-day intervals. Can be mixed with copper sprays. Can be applied post-bloom for shoot blight management. | |
| Notes: Warm weather followed by rain favours blossom infection. See fire blight section of the Guide (page 7-13) for information on risk assessment based on temperature. | ||||||
Stage of Development: Blossom
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Petal fall or Calyx | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| prohexadione calcium (Apogee) 28042 | n/a | 1350 g | 546 g | 12 h | 45 | For suppression of shoot blight, apply at 2.5 to 7.5 cm of new shoot growth with subsequent applications at 14-21 day intervals. Max. 4 sprays/yr. Will also reduce shoot growth. |
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha. Repeat every 7-10 days as long as weather conditions favour disease development (maximum 6 applications per season). See Fire blight description. | |
Stage of Development: Petal fall or Calyx
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Summer | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| copper octanoate (Cueva Commercial) 31825 | M1 | Prepare 0.5-2% solution (5-20 L/1000 L water) | 4 h | 1 | Apply 470-940 L of mixture/ha. Repeat every 7-10 days as long as weather conditions favour disease development (maximum 6 applications per season). See Fire blight description. | |
| Notes: There are no products that can be applied to cure fire blight following infection. Preventative copper sprays may help to protect against new infections. Scout susceptible orchards for symptoms and prune out infected shoots, being careful to disinfect tools between cuts. | ||||||
Stage of Development: Summer
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.
| Stage of Development: Post-Harvest | ||||||
|---|---|---|---|---|---|---|
| Recommended Product Choices | Grp1 | Amount per | REI2 | PHI3 (days) | Precautions and Notes | |
| Ha | Acre... | |||||
| Copper hydroxide (Parasol) 25901 | M1 | 4.7 L | 1.9 L | 48 hrs | 2 days | Apply after harvest with 50% leaf drop. Max. two applications per year. |
Stage of Development: Post-Harvest
Fire Blight
1Group number for resistance management. NC = not classified.
2Re-entry interval on the label. An asterisk(*) indicates that no re-entry is shown on the label, but the WorkSafe BC re-entry interval may apply and is shown.
3Pre-harvest interval. Note: always read and follow the directions on the pesticide label.