What should be noted for greenhouse tomatoes in the hot season?

We have now entered the hot and rainy season, with temperatures often reaching above 35°C, which is unsuitable for the growth and development of greenhouse tomato plants. Pollination will suffer physiological disorders, making fruit set difficult, and pest and disease damage is also very serious. Therefore, it is necessary to prevent high temperatures and do a good job of summer management.

1. Keep the film in place, dig drainage ditches well, and prevent rain exposure and waterlogging. Open the top vents and bottom vents wide so that air convection inside the greenhouse is unobstructed, allowing hot air to be expelled promptly and reducing the temperature and air humidity inside the greenhouse. In addition, since the film has already aged and become contaminated at this time and its light transmittance has dropped to about 50%, it can play a role in shading and cooling. The temperature inside the greenhouse can be about 3°C lower than outside, remaining within the suitable temperature range for tomato growth and development, thereby ensuring normal pollination and fruit set of the tomatoes.

2. Carefully remove buds and prune side shoots, strictly preventing excessive vegetative growth from causing vegetative growth to greatly exceed reproductive growth, leading to excessive plant growth and resulting in flower and fruit drop.

3. A large application of organic fertilizer can be made once in the operation rows, 60-80 kg per furrow, to promote soil aeration, activate root activity, improve absorption capacity, maintain robust growth, and increase autumn yield.

4. Pinch off the growing tips in early to mid-August to control vegetative growth and ensure that young fruits grow into large fruits before the plants are pulled up.

5. Strengthen pest and disease control to ensure the healthy growth of plants and fruits. First, install insect-proof nets at the top vents and bottom vents to strictly prevent pests from entering the greenhouse through the vents. If pests such as aphids, whiteflies, cotton bollworms, and tobacco budworms have already entered the greenhouse and are damaging the plants, spray pesticides promptly to kill them. Second, pay attention to preventing and controlling diseases such as leaf mold, early blight, gray mold, soft rot, and bacterial canker.