Colletotrichum trichellum — Plant Disease
Colletotrichum trichellum is a fungus that causes anthracnose, most often on ivy (especially English ivy). It likes cool, damp conditions and spreads by splashing water, rain, and handling. Look for dark, sunken spots on leaves and stems that often start as small water-soaked marks, then turn tan in the center with darker edges and may follow the veins. Leaves can yellow and drop, and young shoots may die back. It is most common in spring and autumn, or wherever ivy stays shaded, crowded, and wet.
What is Colletotrichum trichellum?
Colletotrichum trichellum is a fungal condition with moderate severity that affects plants. Colletotrichum trichellum is a fungus that causes anthracnose, most often on ivy (especially English ivy). It likes cool, damp conditions and spreads by splashing water, rain, and handling. Look for dark, sunken spots on leaves and stems that often start as small water-soaked marks, then turn tan in...
Colletotrichum trichellum is a fungal disease with moderate severity. This condition is contagious and can spread between plants.
Unlike bacterial infections, Colletotrichum trichellum spreads slowly but is harder to eradicate. Without treatment, affected leaves won't recover. Without isolation, nearby plants can become infected within days.
🧪 Natural vs Chemical: Which Treatment Works for Colletotrichum trichellum?
🌱 Natural Solutions
- ✓ Prune out and discard infected leaves and shoots, cutting 10-15 cm below the last visible spot, and disinfect tools between cuts with 70 percent alcohol or a fresh 1 to 10 bleach solution then rinse and dry.
- ✓ Improve airflow and light by thinning dense growth, spacing plants, and avoiding vines pressed against walls or fences.
- ✓ Water at the base early in the day, keep leaves dry, and avoid overhead watering or misting.
- ✓ Reduce leaf wetness by increasing sun exposure where possible and avoiding mulch piled against stems.
- ✓ Clean up and bin fallen leaves and debris and do not compost infected material.
- ✓ For container plants, repot into a fresh free draining mix and a clean pot and empty saucers so roots are not waterlogged.
- ✓ Use biofungicides labeled for anthracnose on ornamentals such as Bacillus subtilis QST 713, Bacillus amyloliquefaciens strains, or Trichoderma based products.
💉 Chemical Solutions
- ✓ Use home garden products permitted in your area and choose options labeled for ornamental anthracnose including copper based fungicides such as copper hydroxide or copper octanoate or copper soap, potassium bicarbonate, azoxystrobin, and in some regions difenoconazole.
- ✓ Apply preventively or at first signs of spotting and rotate modes of action to slow resistance.
🛡️ How to Prevent Colletotrichum trichellum?
TLDR: Prevent Colletotrichum trichellum with 7 essential care practices. Regular monitoring is key for early detection.
- ✓ Start with healthy plants and isolate new plants for 2 to 3 weeks.
- ✓ Give ivy good airflow and bright light and avoid deep stagnant shade and overcrowding.
- ✓ Water the soil not the leaves and do it in the morning so any splash dries quickly.
- ✓ Keep foliage off the ground and use a light mulch to limit soil splash.
- ✓ Fertilize moderately and avoid heavy nitrogen that encourages soft disease prone growth.
- ✓ Disinfect tools and pots and wash hands or gloves after handling infected plants.
- ✓ Inspect regularly in cool wet weather and remove the first spotted leaves right away.
🔗Related Diseases
Rust
Rust fungi (Pucciniales) are fungal diseases that form rust-colored, usually orange to brown pustules with powdery spore dust on leaves, stems, or fruits. Typical symptoms include small spots that develop into cushions or rings; leaves turn yellow, curl, and drop prematurely. The fungi spread primarily in damp weather and dense foliage. Many ornamental and crop plants are affected, frequently including roses, mallows (hollyhocks), pears (pear rust), and currants. Some rust fungi require two host plants for their life cycle, such as pear and certain juniper species.
Cherry Witches' Broom
Taphrina wiesneri is a fungal disease affecting cherry trees (Prunus species, including sweet, sour, and ornamental varieties). The fungus overwinters in buds and bark, infecting young leaves and shoots during cool, wet spring weather. Infected leaves become thickened, puckered, and curled, often displaying reddish or yellow blotches and a fine whitish bloom on the surface. Severely affected leaves may drop prematurely. Small twigs can develop 'witches' brooms,' which are dense clusters of weak, distorted shoots.
Powdery Mildew
MediumPowdery mildew is a common fungal disease caused by various fungi species including Erysiphe, Podosphaera, Oïdium, and Leveillula. It affects over 10,000 plant species worldwide. The disease thrives in warm, dry climates with high humidity and appears as a distinctive white powdery coating on plant surfaces.
Root Rot
HighRoot rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.