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Rapid Blight Fungicide

Labyrinthula terrestris Fungicide

Description of Rapid Blight (labyrinthula terrestris):
Rapid blight is a cool-season turfgrass disease where irrigation water or the soil has a high level of salinity. The turfgrass appears darker and slightly sunken than the healthy turf. Brown-orange necrotic lesions start at the crown or cut blade tip, but may eventually cover the whole blade.  The roots may appear without rot or discoloration.
According to the manufacturer approved labels: The following fungicide, applied at the listed application rates, will control Rapid Blight.
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Broadcast Treatment
Application Interval:
Spring / Fall
14 - 28 days
Label Rate:
3 lbs per 1,000 sqft
Cost Effectiveness:
Covers 5000 square feet
at a cost of
$11.99 per 1,000 sqft
Apply when conditions are favorable for disease development which occurs normally on salinity stressed grasses. Occurs most commonly on cool season grasses used under overseeded conditions. Begin applications in fall and follow with spring applications as needed. DO NOT apply more than two strobilurin-based fungicides sequentially prior to rotation to a different mode-of-action.

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