This is an example of leaf spot. There are many types, most of them fungal. Different plants are prone to different leaf spot fungi…black spot on roses, for example. While the leaf spot on your honeysuckle is different than that which affects roses, there may be something about this location that promotes these infections and the most common cause is watering. Frequent splashing of foliage with water is a prescription for leaf-spot fungi on many plants. Be sure that this location isn’t being frequently hit with spray from lawn sprinklers, for example. Sometimes next to a house it’s dripping from gutters above that causes the frequent wetting of the foliage. Changing the soil won’t help. In general, to control leaf spot try not to get foliage wet when watering. Set any automatic irrigation to go on less frequently but for a longer period of time (water deeply less often) – plants that are prone to leaf spot can be sprayed with one of the organic fungicides starting early in the season, before the plant gets the problem.
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