What is fruit and root rot in Papaya?
This disease was seen on young transplants. The initial symptom is a watery soaking of the lower stem followed by its disintegration. Plants eventually wilt. Most of the fruits suffering from the disease suffer and fall from there and all of them end up falling down and rotting. Also, some stems had a constriction with rotting fruits above, and ultimately the trees fall down. The fruits showed concentric rings, which expand and rot away. Currently the weather is wet, but the farmer has irrigation so the plants never experienced any adverse conditions.
Causal organism: Phytophthora palmivora
Water-soaked lesions on unripe fruit that oozes latex; withering fruit; water-soaked lesions on leaf scars of fruit bearing stem; mature fruit covered in white mycelium
Disease can be controlled through the use of appropriate protective fungicides such as mancozeb or copper sulfate; root rot in seedlings can be prevented by planting in holes filled with soil in which papaya has never been grown – by the time the roots extend out of the added soil the plant is no longer susceptible to the disease.
Photo source : www.infonet-biovision.org