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Plant protection agents

 

Flower bulbs planted in a habitat simulating their natural habitat will slowly increase in number. Any diseases or pests will generally be kept under control by a balanced biodiversity. The application of chemical plant protection agents to control such problems can therefore be omitted. The growth process of flower bulbs can be threatened in various ways but is usually due to harmful soil pathogens or animal pests. Many of these kinds of damage can be prevented by purchasing the right planting material, choosing the right planting site, and providing good maintenance.

When planted in damp shaded locations for multiple-year flowering, some tulips may emerge with brown spots on their leaves (a symptom of Botrytis) and with an unhealthy appearance. The best advice is to remove them immediately after emergence so that the disease does not spread to neighbouring plants. Bulbs intended for multiple-year flowering should not be planted too closely together; they will then receive enough air to reduce the risk of Botrytis.

Rhizoctonia solani is another fungal disease that can cause problems. If you know that there is a high risk that the soil at the planting site might contain this pathogen, it would be a good idea to treat the soil. The symptom typical of this disease consists of small red spots on the plant, usually on the exterior of the stem and leaves.