Greenhouse ventilation key to extending tomato harvest

As summer wanes, gardeners are focused on harvesting the bounty from their gardens and greenhouses. In August and September, tomato plants in greenhouses are yielding a rich harvest. To extend the season of ripe, flavorful tomatoes, consistent care in the greenhouse remains crucial.

Shorter days increase nighttime humidity, creating ideal conditions for fungal diseases to spread. In unheated greenhouses, common ailments include gray mold, leaf blight, and a brown rot affecting the fruit. To combat these issues, continuous ventilation throughout the day and night is recommended. This means keeping vents and doors open, even when nighttime temperatures drop below 10 degrees Celsius.

Only when temperatures are expected to fall below five degrees Celsius should greenhouse doors be closed overnight. Maintaining open doors during warmer periods ensures natural air circulation, which is vital for keeping tomato plants dry. Fungal diseases thrive on moisture, and reducing water droplets on plant surfaces is key to prevention.

Another important practice for disease control is thinning out dense foliage, especially for determinate or bush varieties. Removing excess leaves and young shoots allows air to move freely through the plant. It is also essential to promptly remove any leaves or fruits that show signs of disease, further promoting plant health and a sustained harvest.