A network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests.
PestNet is a network that helps people worldwide obtain rapid advice and information on crop protection, including the identification and management of plant pests. It started in 1999. Anyone with an interest in plant protection is welcome to join. PestNet is free and is moderated, ensuring that messages are confined to plant protection.
October 2010. From Rabaul, PNG, images of discoloured Abelmoschus leaves (aibika). The problem is worse during dry spells. It was thought likely that a virus was the cause, transmitted by the aibika jassid, Amrasca devastans).
The only definitive virus recorded on Abelmoschus is Hibiscus chlorotic ringspot virus (HCRSV), and this has been reported from Fiji, PNG, Solomon Islands and Vanuatu. This is assumed to be beetle transmitted. See:
Brunt A A, Spence NJ (2000) The natural occurrence of Hibiscus chlorotic ringspot virus (Carmovirus; Tombusviridae) in aibika or bele (Abelmoschus manihot) in some South Pacific Island countries. Plant Pathology 49: 798.
However, it was thought more likely that the symptoms in the photos were caused by the jassid. The symptoms are common in aibika throughout PNG. The plant will recover after the dry spell. Also, sprays with Karate (permethrin) at 100-150ml/20L will control the jassids. The jassid also affects peanuts, especially during dry spells.