Causal Organism: Pyrilla purpusilla Walker
- Pyrilla is the most destructive foliage-sucking pest of sugarcane.
- Heavy rainfall followed by 75-80% humidity, intermittent drought periods, high temperature (26-300c) and wind movement favours rapid build-up of the pest.
- Cane yield loss is about 28% while 1.6% unit loss in sugar content.
- Adults and the nymps suck leaf sap from the under surface of the lower leaves.
- When the infestation is heavy, leaves turn yellowish white and wither away.
- Due to continuous desapping by large number of hoppers top leaves in the affected canes dry up and lateral buds germinate. The hoppers exude a sweet sticky fluid known as honeydew, which promotes quick and luxuriant growth of the fungus, capanodium species and as a result the leaves are completely covered by the sooty mould.
Submitted by kanchannainwal1 on Wed, 19/08/2009 - 11:14