Alternaria rot of fruit is found in all countries with apple or pear gardens.
Symptoms of Alternaria rot: Symptoms on fruits are round, brown to black. They are dry and firm and shallow. These spots develop around the area of ruptured and damaged skin and the bumps of the abdomen and the tail of the fruit. Occasionally in the central circle around the ovary, a blackish-gray mold will grow and rot the fruit. But in a pear, the rotting of Alternaria rot starts from where the tail is cut and moves on to the rest.Occasionally in the central circle around the ovary, a blackish-gray mold will grow and rot the fruit. But in pear, the rotting starts from where the tail is cut and moves on to the rest.
Factor of the disease: The causive agent of Alternaria rot of pears the is Alternaria alternate. Another name is A. tenuis Nee. The conidiophores of this fungus are simple or branched. These conidiophores are formed individually or collectively. There are one or more conidia effects on conidiophores. The conidia of the fungus are chained and their surface is flat or warty. They are also golden brown.
Disease cycle of Alternaria rot of apples: It is a saprophytic fungus and is also known as a weak pathogen. Its habitat is dead and weakened tree tissues and feeds on apples and pears after or before harvest. This fungal pathogen enters the tree through weak or damaged tissues. These weak tissues can be injured or weakened by mechanical, chemical, physiological aging or sunburn.
Control of Alternaria rot of fruits: Avoid scars on the fruit during harvest.
Clean the boxes and equipment for transportation of fruits and clean with appropriate disinfectants.
If you use benzimidazole group fungicides to control stockpiling and postharvest disease, this will aggravate the alternative caries disease.