Brown Rot Blossom Blight

About this disease

Brown Rot Blossom Blight Disease: A Blight on Your Harvest

Brown Rot Blossom Blight, a fungal disease caused by Monilinia species, is a notorious nemesis for stone fruit lovers in South Africa. Here’s what you need to know about this unwelcome guest in your orchard:

Physical Characteristics and Identification:

• Blossoms: The first, and perhaps most dramatic, sign is the wilting and browning of blossoms and flower spurs. Infected blossoms often resemble burnt coffee grounds, clinging stubbornly to the branches.
• Twigs: As the disease progresses, brown, sunken cankers develop on infected twigs, sometimes oozing gum.
• Fruit: As fruits approach maturity, tan or brown, firm, circular spots appear on the skin. These blemishes rapidly expand, softening the fruit and turning it into a moldy, brown mess.

South African and Afrikaans Names:

• Afrikaans: Bruinvrotbloeisemskimmel
• English: Brown Rot Blossom Blight

Why it’s a Disease:

Brown Rot Blossom Blight weakens and disfigures blossoms, hindering fruit set. Infected fruits become unpalatable and unusable, leading to significant crop losses. The fungus can survive in mummified fruits and infected twigs, ready to unleash its blight again the following season.

Combating Brown Rot Blossom Blight:

• Prevention is key: Start by choosing disease-resistant fruit tree varieties. Practice good sanitation – remove and destroy fallen fruits and twigs, especially mummies. Ensure proper air circulation by pruning infected branches and avoiding dense planting.
• Fungicides: If prevention fails, fungicides can offer protection. Opt for targeted sprays during specific stages of flower and fruit development, as per label instructions. Remember, responsible fungicide use minimizes environmental impact.
• Natural alternatives: Neem oil, potassium bicarbonate, and Bordeaux mixture offer eco-friendly options for managing mild infections.

Additional Tips:

• Monitor your fruit trees regularly, especially during warm, humid weather when the disease thrives.
• Promptly remove and dispose of infected blossoms and fruits to prevent further spread.
• Avoid injuring fruits during harvest, as wounds create entry points for the fungus.

By understanding the characteristics and lifecycle of Brown Rot Blossom Blight, and implementing preventative and control measures, you can protect your precious stone fruit trees and enjoy bountiful, blemish-free harvests. Remember, vigilance and timely action are your best weapons against this destructive disease.