Rex Begonia with Pythium Root Rot: Prevention & Cure
Begonia rex
Pythium Root Rot on Rex Begonia: What to Know?
Pythium Root Rot on Rex Begonia (Begonia rex) is a fungal condition with high severity. Rex Begonia has moderate susceptibility to this disease. Pythium root rot is a serious fungal disease caused by various Pythium species including P. aphanidermatum, P. ultimum, and P. irregulare. These water molds are present in practically all cultivated s...
Rex Begonia is a hard-care plant. Recovery from Pythium Root Rot takes approximately 14 days with proper treatment. As an indoor plant, ensure good ventilation to aid recovery.
Unlike bacterial infections, Pythium Root Rot on Rex Begonia can be managed with organic fungicides. Without precautions, chemical treatments for Pythium Root Rot can be harmful to pets. Use organic methods for Rex Begonia in pet-friendly homes.
ð What Does Pythium Root Rot Look Like on Rex Begonia?
- âĒ Dark brown to black wet rot of roots
- âĒ Roots soften and disintegrate easily
- âĒ Outer cortical tissue pulls off easily exposing vascular strand
- âĒ Brown and dead root tips
- âĒ Stunted growth and undersized plants
- âĒ Wilting during the day with recovery at night
- âĒ Progressive yellowing of leaves
- âĒ Plant collapse and death in severe cases
- âĒ Crown may turn brown-black with soft rot
â What Causes Pythium Root Rot on Rex Begonia?
- â Infection by Pythium species (P. aphanidermatum, P. ultimum, P. irregulare)
- â Soil moisture above 70% of available water capacity
- â Poor drainage and waterlogged substrate
- â Overwatering or too frequent irrigation
- â Favorable temperatures (above 77°F for P. aphanidermatum, lower temperatures for other species)
- â Use of non-pasteurized or contaminated substrate
- â Contaminated pots, tools, and surfaces
- â Spread through contaminated irrigation water
- â Transmission by fungus gnats and shore flies
- â Excessive levels of ammonium or soluble salts in substrate
ð How to Treat Pythium Root Rot on Rex Begonia?
TLDR: Treat Pythium Root Rot on Rex Begonia with quick treatment (~7 days) or organic (~14 days). Rex Begonia has moderate susceptibility to this disease.
Quick Fixes
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Organic Treatment
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ðĄïļ How to Prevent Pythium Root Rot on Rex Begonia?
TLDR: Prevent Pythium Root Rot on Rex Begonia with 10 essential preventive care practices.
- â Use well-drained substrate with adequate air pore space
- â Pasteurize or solarize substrate before use (140°F for 30 min)
- â Avoid overwatering and maintain good water management
- â Ensure proper drainage in pots and beds
- â Inspect roots of new plant material before introducing to collection
- â Keep pots, tools, and growing areas clean and disinfected
- â Keep irrigation hose ends elevated off the ground
- â Avoid excessive levels of ammonium and soluble salts in substrate
- â Use substrate with at least 20% composted pine bark
- â Control fungus gnats that can transmit spores
ðą How to Care for Rex Begonia to Prevent Pythium Root Rot?
ð§ How to Water
Water when the top inch of soil feels dry, typically once a week. Use distilled or rainwater to prevent brown leaf tips. Never let the plant sit in water, and avoid wetting the leaves to prevent fungal issues.
âïļ Lighting
Provide bright, indirect light. Place 2-3 feet from a south-facing window or in front of an east-facing window. Avoid direct midday sun which can scorch the leaves. They also thrive under fluorescent lights.
ðŠī Ideal Soil
Use a well-draining, lightweight potting mix rich in organic matter. A blend of peat moss, perlite, and vermiculite works well. Maintain slightly acidic pH between 5.5-6.5.