Spring Dead Spot

Causal Agent: Leptosphaeria korrae

Susceptible Turfgrasses: Common couch grass, South African couch grass and their hybrids.

Symptoms

  • Circular patches of bleached, straw coloured dead grass appear in Spring as the dormant grass resumes growth.

  • Patches are also visible in Autumn and Winter after a series of unusually cool days or wet, cold weather.

  • Patches are a few centimetres to 1m in diameter.

  • Patches reappear and expand in the same spot for 3 or more years.

  • After 2 to 3 years, the centres of active patches may remain alive, and the patch takes on a “ringlike” appearance.

  • Rings that coalesce can appear as serpentine arcs.

  • Roots of affected plants turn dark brown to black and are severely rotted.

  • Regrowth of grass into affected patches is slow and patches may remain barren of fill with weeds.

  • When the grass recolonises an affected area it remains stunted.

Conditions Favouring Disease

  • Most active when temperatures are cool (12 to 14°C) and soil is moist.

  • Roots of Couch grow most rapidly at 24 to 29°C and extremely slowly at 15°C, thus the fungus has a competitive advantage at low temperatures.

  • Spring Dead Spot favours cool, wet weather in the spring and autumn and daily temperatures of less than 15°C.

  • This disease is typically found where thatch is more than 1.2cm thick and in locations with poor drainage and low potassium levels.

  • Heavy applications of nitrogen in late summer often increase disease severity the following spring.

  • Spring Dead Spot is more severe on turf that is over three-years old and in locations with long dormancy and cold temperatures.

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Products to Use Spring Dead Spot

Prop 500

Prop 500_10L

50% Propiconazole Prop 500 Fungicide is a broad spectrum fungicide containing 500g/L of the active ingredient Propiconazole. It is specifically registered…

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Dedicate

NEW Dedicate_1L_Straight_RGB

10% Trifloxystrobin + 20% Tebuconazole Dedicate turf fungicide contains two active ingredients with two different modes of action, providing curative and…

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Headway Maxx

Headway_Maxx_5L_Can_LR

6.2% Azoxystrobin + 1.04% Propiconazole Headway Maxx combines the strength, longevity and broad spectrum of Heritage MAXX with the speed and…

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Banner Maxx

BannerMaxx5L_LR

15.5% Propiconazole Banner Maxx is an excellent choice as an early curative treatment, providing systemic broad spectrum control of major turf…

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