Why Do My Currant Leaves Have Brown Spots and Fall Early?

Small brown spots appearing on currant leaves from midsummer onwards, often surrounded by a faint yellow halo, followed by premature leaf drop — sometimes stripping the bush bare by August — are the classic symptoms of currant leaf spot. This fungal disease (Drepanopeziza ribis) is widespread in British and European gardens and causes more early defoliation on currant bushes than any other single pathogen. Understanding its life cycle is the key to breaking the cycle of repeat infection year after year.

The life cycle of currant leaf spot

The fungus overwinters in fallen leaves and old stems. In spring, spores are released during wet weather and infect young leaves through natural pores and tiny wounds. The first spots appear from late May onwards — small, irregular brown marks, often with a darker border. Each spot produces further spores, so in a wet summer the disease spreads in successive waves through the canopy. By late July or August, heavily infected leaves turn yellow around the spots and drop, leaving the bush partially or completely bare.

Why fallen leaves matter so much

The primary spore source for next year's infection is the layer of spotted leaves lying on the ground around the bush. Removing and disposing of these leaves — either burning them, sending them off with green waste, or burying them deeply — is the single most effective way to reduce disease pressure the following season. Do not add infected leaves to a home compost heap unless it runs hot enough to kill fungal spores consistently. Raking up fallen leaves promptly in autumn makes a measurable difference to infection levels the following spring.

Cultural prevention

Good air circulation through annual pruning reduces the leaf wetness periods that allow spores to germinate. Removing congested growth from the centre of the bush, cutting out low branches that sit close to the soil, and spacing bushes adequately at planting all reduce infection risk. Avoid wetting the foliage when watering — irrigate at the base rather than overhead to keep leaves dry. Mulching the base of the bush with a thick layer of compost or bark helps prevent soil splash carrying dormant spores up onto lower leaves in heavy rain.

Fungicide treatment

For bushes with a history of severe defoliation, a preventive fungicide programme can protect the leaf canopy through the most vulnerable period. Copper-based fungicides applied at bud burst and repeated at three-week intervals through June and July are effective. Sulphur-based products also work well at lower temperatures. Timing matters — once spots are well established, fungicides slow further spread but cannot reverse existing damage. The goal is to maintain enough leaf cover to allow the bush to photosynthesise through harvest and into autumn.

Choosing resistant varieties

Variety resistance to leaf spot varies considerably. Ben Connan, Ben Hope, and Ben Sarek are among the more tolerant blackcurrant varieties. On red currants, Rovada and Junifer perform better than older cultivars in disease-prone sites. If leaf spot is a persistent annual problem on your site despite good hygiene and cultural management, replacing affected bushes with a resistant variety is likely more cost-effective in the long run than repeated spray programmes on susceptible cultivars.