Moteado
Pear Scab
Venturia Pyrina
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Venturia pyrina is an ascomycete fungus responsible for the disease known as pear spot or scab. This pathogen survives in remains of fallen leaves during the winter in the form of pseudothecia, which are reproductive structures where ascospores develop. In spring, mature ascospores are released during periods of humidity, being dispersed by the wind to the young shoots and leaves of the pear tree. Upon reaching a susceptible tissue, the spores germinate and infect the plant through the cuticle, without the need for wounds. During the growing season, the fungus also produces conidia in lesions that can cause new secondary infections, spreading rapidly under favorable humidity and temperature conditions. This ability to produce multiple infection cycles in a single season makes Venturia pyrina a very aggressive and difficult to control pathogen.
SYMPTOMS
In the pear tree, Venturia pyrina causes spotting or scab, a disease that mainly affects the leaves, fruits and young shoots, reducing the quality and yield of production. The symptoms begin with the appearance of dark, velvety Taches on the leaves and fruits, which can merge and cover large areas, causing deformation and premature falls.
- Dark, velvety Taches on the leaves
- Deformations and scars on the fruits
- Premature fall of leaves and fruits
- Lesions on young shoots
- Delay in plant growth
- Reduction in fruit quality
TEMPERATURE AND HUMIDITY
15-25°C
70-90%
HOW IS IT SPREAD?
Wind, Rain, Pruning tools, Direct contact between plants
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• SULFUR 70% [SC] P/V
• BOSCALIDE 25.2% + PYRACLOSTROBIN 12.8% [WG] P/P
• CAPTAN 47.5% [SC] P/V
• CAPTAIN 80% [WG] P/P
• CIPRODINIL 18.75% + TEBUCONAZOLE 12.5% [EC] P/V
• CIPRODINIL 30% [EC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• Cyprodinil 50% [WG] P/P
• DIFENOCONAZOLE 1.67% [EC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• Ditianone 12.5% + Potassium phosphonates 56.1% [SC] P/V
• DITIANONE 25% + PYRIMETANIL 25% [SC] P/V
• DITHIANONE 50% [SC] P/V
• DITHIANONE 70% [WG] P/P
• DODINA 40% [SC] P/V
• DODINA 54.4% [SC] P/S
• FLUOPYRAM 20% + TEBUCONAZOLE 20% [SC] P/V
• FLUXAPYROXAD 30% [SC] P/V
• POTASSIUM PHOSPHONATES 66% + CAPTAN 36% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 35% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 40% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• KRESOXIM-METHYL 25% + DIPHENOCONAZOLE 12.5% [WG] P/P
• KRESOXIM-METHYL 50% [WG] P/P
• METIRAM 70% [WG] P/P
• COPPER OXYCHLORIDE (Exp. in Cu) 52% [SC] P/V
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% [SC] P/V
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• PIRACLOSTROBIN 20% [WG] P/P
• CALCIUM POLYSULPHIDE 38% [DC] P/V
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EC] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TEBUCONAZOLE 25% [WG] P/P
• TETRACONAZOLE 10% [EC] P/V
• TETRACONAZOLE 12.5% [ME] P/V
• TETRACONAZOLE 4% [ME] P/V
• TRIFLOXISTROBIN 50% [WG] P/P
Authorized treatments in organic farming
• SULFUR 70% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 99% [SP] P/P
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 35% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 40% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE (Exp. in Cu) 52% [SC] P/V
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% [SC] P/V
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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- Plant varieties of pear trees resistant to speckle.
- Maintain good garden hygiene, eliminating and destroying remains of fallen leaves and other plant residues.
- Perform appropriate pruning to improve air circulation and reduce humidity within the tree canopy.
- Apply preventive fungicides during critical stages of infection, especially in spring.
- Monitor weather conditions and adjust fungicide treatments according to humidity and temperature forecasts.
- Avoid sprinkler irrigation that increases humidity in the leaves and fruits.
- Carry out regular inspections to detect early symptoms of the disease and act quickly.
- Implement fungicide rotations to prevent the development of fungal resistance.
Recommendations
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