1.Heart rot: Phytophthora parasitica
2.Leaf and Fruit rot: Cyratostomella paradoxa
Base or butt rot of planting material occurs when they are not dried and packed with little aeration.
Fungus also destroys older plants by entering through wounds caused in the collar region while weeding or other operations.
In severe conditions the entire plant may turn dark and rot within two or three days
The disease can be controlled by dipping planting materials in 0.3% Dithane Z-78 or by spraying on leaves.
Copper fungicide should not be used in pineapple as they cause leaf scorching.
The diseased plants must be destroyed and suckers for propagation should never be collected from the infested area
3.Thielaviopsis rot: Thielaviopsis paradoxa
The symptoms start at the stem and advance through most of the flesh with the only external symptom being slight skin darkening due to water soaking of the skin over rotted portions of the flesh.
As the flesh softens, the skin above readily breaks under slight pressure
Avoid suckers from infected area for planting.
Avoid deep planting and used raised beds, improve drainage.
Use Bordeaux mixture 1% or Copper oxychloride 0.25% for preplant dip and for soil drench.