Scab
Fusicladium Spilocaea
What is Scab (Fusicladium Spilocaea)?
Scab, caused by the fungal pathogens Fusicladium spilocaea and related species, is a plant disease that affects various hosts. It is distributed globally and commonly infects fruit trees. Scabs initially appear as pale or yellow spots on leaves, progressing to dark, olive-colored spots with velvety fungal growth. Leaves may twist, yellow, and drop prematurely. On fruit, lesions form as velvety gray-black or greasy spots with tan sunken areas and olive-colored spores. Severe infections can cause fruit distortion, cracking, and drop.
How does Scab (Fusicladium Spilocaea) occur?
F. spilocaea reproduces through spore production and dispersal. Overwintering on plant debris or dormant buds, the fungus releases spores during favorable conditions. Dispersed by air or water splashing, these spores land on susceptible plant surfaces, germinate, and initiate new infections. This reproductive cycle enables F. spilocaea to spread and persist, leading to the occurrence and recurrence of scab disease in various susceptible plants.
Symptoms
1 - Impacts on plants and Environment
Scab disease, caused by Fusicladium spilocaea, harms plants with leaf spots, defoliation, and fruit blemishes, impairing their health and productivity.
Solutions
1 - Prevention
• Choose scab-resistant plant varieties when possible. • Properly dispose of fallen leaves and infected plant debris to reduce overwintering sources. • Promote good air circulation by pruning and thinning branches to reduce humidity. • Avoid overhead irrigation that wets the foliage, or water early in the day to allow leaves to dry quickly.
2 - Treatment
• Fungicide application can be considered for severe scab infections. Follow label instructions and apply appropriate fungicides during the recommended timing. • Consider using organic or biological fungicides as alternatives to synthetic options. • Monitor and remove infected leaves, fruit, or branches to reduce disease spread. • Regularly inspect plants for early symptoms and take prompt action to prevent further infection.
