Phytophthora
Crown Or Neck Rot
Phytophthora Sp.
Pathogen:
Oomycete
Type:
Risk to the plant:
CRITICAL
DESCRIPTION
WHO CAUSES IT?
Phytophthora sp. is a genus of oomycetes, also known as aquatic fungi, that causes various plant diseases, including crown or neck rot in apple trees. These pathogens thrive in moist soils, where they release motile zoospores that can infect the roots or base of apple trees. Zoospores can travel through water currents and infect new plants.
SYMPTOMS
Crown rot in apple trees, caused by Phytophthora sp., can cause the death of roots and tissue at the base of the trees. Symptoms include wilting and yellowing of the leaves, and often a general weakening of the tree which can lead to the death of the apple tree.
• Wilting and yellowing of leaves.
• Death of the roots.
• General decline of the plant.
• Weakening of the base of the trunk and crown.
• Loss of vigor and productivity in the tree.
TEMPERATURE AND HUMIDITY
18°C - 25°C
70% - 90%
HOW IS IT SPREAD?
Contaminated irrigation water, surface water streams, contaminated pruning tools.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• CAPTAN 47.5% [SC] P/V
• CAPTAIN 80% [WG] P/P
• FOSETIL-AL 80% [WG] P/P
• Potassium phosphonates 25% (Exp. as phosphorous acid) [SL] P/V
• POTASSIUM PHOSPHONATES 50.4% (exp. as phosphorous acid) [SL] P/V
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [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 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• PROPAMOCARB 60.5% (c. hydrochloride) [SL] P/V
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
Authorized treatments in organic farming
• Potassium phosphonates 25% (Exp. as phosphorous acid) [SL] P/V
• POTASSIUM PHOSPHONATES 50.4% (exp. as phosphorous acid) [SL] P/V
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [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 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] 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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• Avoid excessive irrigation to reduce soil moisture.
• Use apple tree varieties resistant to Phytophthora.
• Improve soil drainage to prevent water accumulation.
• Avoid planting in low quality soils or soils prone to waterlogging.
• Disinfect pruning and harvesting tools to prevent transmission.
• Avoid soil compaction to maintain good air circulation.
• Apply specific fungicides when necessary and during critical periods.
Recommendations
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