Drechslera, Curvularia and Pyricularia spp.

Leaf Spot

Other common names:

Not applicable.

 

Description:

Spores of Drechslera, Curvularia leaf spot (e.g. C. lunata, C. clavata) and Pyricularia grisea (Grey leaf spot) cause leaf-spotting diseases when the turfgrass is stressed. Curvularia are often irregular shaped patches of green and yellow dappled patterns that extend downwards from the leafblade tip. Affected turf turns brown, then grey as the turf declines and may results in death of affected turf.

 

Susceptible Turf:

Kikuyu turfgrass, including Drechslera and Curvularia (ASTC, 2016). Green couch and hybrids. Some Zoysia varieties will also show occasional leaf spot disease under humid conditions (Loch, 2013). Curvularia clavata on Durban grass as reported by Aldous and Loch (2013). Buffalograss is susceptible to grey leaf spot (Pyricularia grisea) and Curvularia leaf spot (C. lunata).

 

Symptoms:

The causal fungi usually first invade the leaves, producing small brown spots. As the disease worsens, the spots on leaf blades expand and produce a dark purplish-red oval border around a tan centre. The spots enlarge until the entire width of the leaf blade is blighted.

 

References:

  • Aldous, D. and Loch, D. 2013. A REVIEW OF THE BIOLOGY, ADAPTATION AND MANAGEMENT OF DACTYLOCTENIUM AUSTRALE STEUD. DURBANGRASS) AS A TURFGRASS WITH PARTICULAR REFERENCE TO AUSTRALIA, International Turfgrass Society Research Journal, Vol. 12, pp. 135-142.
  • Loch, D. (2013) Zoysias: the environmental turfgrass. Australian Turfgrass Management Journal 15(1), 46–49.

 

Control options:

  • Pesticides: See available tabs below for registered products. Use as per label instructions.
  • Integrated Pest Management (IPM): Use a combination of approaches listed on this page.
  • Cultural: Do not water the turfgrass in the late afternoon or evening.
  • Mechanical: Nil.

 

Disclaimer:

Turf Finder or its developer accepts with no responsibility for any consequences whatsoever resulting from the use of any information or product(s) listed herein. Products are to be applied as per label instructions.

Control Options

Chief Aquaflo

 

Chief Aquaflo