Seasons of Activity
Symptoms are evident from May to September under favourable conditions. Fusarium survives through the spring and summer as spores and mycelium in the thatch or soil when temperatures are above 16°C or when it is dry. Under cool, wet weather, spores may germinate or mycelium may grow from thatch or soil and infect leaves within the turf canopy.
Areas of Plant Infected
Foliage and Roots.
Cultural Methods of Control
Remove excess thatch and compaction, balance nutrition, test soil PH.
Key Distinguishing Feature
It is often characterised by an orange/brown colour in the patch and patch borders of the affected area(s) of the turfgrass. The circular patches less than 5cm in diameter first appear as water-soaked spots, then rapidly change colour to tan, brown, dark brown and finally light grey. Patches can enlarge up to 20cm in diameter overtime.
Winter Fusarium is caused by the fungus Microdochium nivale It was identified for many years as a Fusarium species, hence the usage of the name Fusarium. It is primarily a cool-season and winter disease, and a pathogen of cool-season turf. However, it has been recorded on warm-season turf grasses species.
Key Products for Control:
Impala - 60mL/100sqm in 5L of water (sprayer only) or 6mL/10sqm in 9L of water (watering can)
Tombstone Duo - 20mL/100sqm in 4-16L of water