Chinese flowering quince vs Japanese quince

In wet springs fungal leaf spot and scab attack it and it can drop much of its foliage by midsummer; this looks poor but rarely kills the shrub. It is susceptible to fire blight, so near apples, pears and quinces watch for blackened, hooked shoot tips and cut them out back to healthy wood. On strongly alkaline soil the leaves turn yellow (iron chlorosis). Aphids, and less often scale and mites, appear on new growth, and late frost can kill the early flower buds.

It is susceptible to fire blight (Erwinia amylovora), a dangerous bacterial disease of apple, pear and quince in Central Europe: cut blackened shoots with hooked tips back into healthy wood and preferably do not plant it close to pome fruit trees. In wet springs leaf spot and scab can cause early leaf drop, and aphids feed on the new growth. On strongly limy, alkaline soil it turns yellow from iron deficiency (chlorosis). Late frosts can kill the early flowers, and then there is no fruit either. Wind-blown litter and leaves get caught in the dense thorny branches, and pruning it without gloves is unpleasant.