Choose a plant densuty that will allow optimum quality and production. High plant density can make it difficult to get good spray coverage and reduces air circulation increasing the risk from disease. Widely spaced plants are less disturbed and damaged by cultural operations and this helps reduce both the distribution of fungal spores and sites for infection. Air circulation Plan the internal layout for efficient air circulation to al parts of the greenhouse. Ensure there is air movement between all plants and that there are no dead spots.
Air movement helps keep the plants dry and reduces the risk of diseases.
Watering Avoid a watering system that sprays the aerial parts of plants. This increases the risk of infection of many plant pathogens. If plants are wetted, make sure that there is a way to dry them by nightfall. We all know that greenhouse vegetable and fruit growers have to increase production and the quality of production to remain economically viable. Flower growers also have to ensure that their produce meets the quality requirements of the markets.