Pest: Bacterial leaf spot – Pseudomonas syringae
Symptoms: Often produces small tan spots with reddish-brown margins on leaves. Spots may be surrounded by a light green to yellow halo and sometimes the centre of the spots dry and fall out leaving a shot-hole appearance. Symptoms vary depending on the host plant. There are many strains that are specific to particular plant species, but collectively they have a very wide host range.
Transmission: The disease is mainly introduced via infested cuttings, contaminated seed, or when seed pods come into contact with bacteria in plant debris during harvest and handling. Bacteria overwinter in cankers on twigs and limbs. More