Irrigation is the artificial way of applying optimum amount of water to the crops for its growth and development and that water do not come directly from rainfall but from other sources such as rivers, streams, lakes or already harvested and stored rainwater.
Mazao duni, kuchelewa kuiva kwa matunda, rangi isiyo sawasawa ya matunda ni matokeo ya mashambulizi. Lakini pia dalili za ugonjwa hutegemeana sana umri wa mmea ulioshambuliwa, hali ya mazingira, aina au jamii ya virusi vilivyopo lakini pia aina ya nyanya pia.