Nothing can be be more disappointing than seeing brown spots or thinning grass in an otherwise healthy lawn. Other obvious signs of fungal attacks on lawns are uncontrolled growth of mushrooms, powdery coating in leaf blades and brown patches. Natural fungicide for lawns are corn meal, corn gluten and molasses, but they are not effective as chemical based ones. In general, three types of chemical fungicides are available for controlling fungal diseases in lawns. They are grouped according to the mode of action against the fungal pathogens.
- Penetrant Fungicides: As the name goes, this type of fungus killing chemical is directly absorbed by the lawn grasses. Upon attack by specific fungal strains, the fungicide from the plant parts causes toxicity to the fungi and kills them.
- Systemic Fungicides: Once applied, these fungicides are circulated to the grass parts and retain in the system for a long time. They control fungus in the same way as penetrant fungicides.
- Contact Fungicides: This type of fungicide for lawns adheres to the plant parts after application. As fungus and its spores come in contact with grasses, the chemicals present in them them kill fungus.
Selecting the best fungicide for lawns depends upon the type of fungal pathogen, extent of infestation on lawn grass types and more importantly, the weather conditions in the area. While some subside with changes in weather conditions, others need prompt treatment with fungicides. Fungal diseases that call for fungicide application are severe rust, leaf smut, dollar spot, rhizoctinia blight, snow molds and stripe smut amongst others. Consider using fungicides for lawns only after confirmation of these fungal diseases
