The fungus that causes this problem spreads rapidly in the warm, humid conditions of a greenhouse. It usually becomes apparent on the lowest tomato leaves from early or midsummer, which develop yellow blotches on the upper leaf surface. The leaves eventually turn brown and wither. If the problem isn't tackled, tomato yields are lower and the fungus can overwinter in the greenhouse and persist the following year.

Ad

Symptoms

Tomato leaves develop yellow blotches, then turn brown and wither. The crop might also be reduced.

Find it on

tomatoes

Ad

Organic

Good ventilation in the greenhouse helps, with plants well spaced out. Avoid splashing the leaves when watering. Promptly remove and get rid of any infected leaves and destroy all the plants at the end of the season. Disinfect the entire greenhouse and choose resistant varieties such as 'Dombello' and 'Shirley'.

Ad
Ad
Subscribe to Gardeners' World magazine
Get your first 6 months for just £12. Subscribe now.
Subscribe now
The Thrifty Gardener

Get a FREE Thrifty Gardener Guide

Packed full of money-saving tricks and ideas, this 132-page Guide is worth £7.99. Register for free, to download your FREE copy.
Get your Guide
In Conversation at Kew Gardens
Join Adam Frost and Frances Tophill at Kew Gardens for our NEW live event, this September.
In Conversation
Ad