The effects of this damage typically manifest in the new growth first. The pathogen then multiplies in the apoplast (the spaces between plant cells). It is most commonly spread from affected tissues by the wind and rain, but can also be spread via insect vectors and pruning tools.ĭisease occurs when the pathogen enters the plant through wounds or natural openings like the stomata (air pores) in the leaves, and releases toxins which by-pass the plant's immune system and damage plant cells. It can lay dormant until the right conditions for development occur. The pathogen can overwinter in cankers and other diseased plant material like twigs and leaves. The bacterium favours wet, cool conditions with infection likely to occur in winter or spring. There are no fungicide sprays available to home gardeners for the control of lilac blight. There is some evidence that white flowered varieties are more susceptible and dwarf varieties less so.
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