Leaf and Sheath Spot

Question 1

Leaf and Sheath Spot

Cause:

Answer 1

Rhizoctonia Zeae

Question 2

Leaf and Sheath Spot is very similar to what?

Answer 2

Brown Patch

Question 3

Rhizoctonia zeae

Host

Answer 3

• Festuca
• Poa
• Lolium
• Agrostis
• Cynodon
• Zoysia

Question 4

Rhizoctonia zeae

Predisposing Factors:

Answer 4

• Hot weather 70-105 degrees (89 optimal)
• Excess leaf wetness
• Low Height of Cut
• Low fertility input
• Use of PGR’s

Question 5

Rhizoctonia zeae

Symptoms:

Answer 5

• Brown patches of turf
• Irregularly shaped leaf lesions that are tan with reddish-brown borders

Question 6

Rhizoctonia zeae

Signs

Answer 6

• Multi-Nucleate mycelium
• Mycelium has:
  
  • right angled branching
  • septa near branching
  • pinched at branching
• Orange Sclerotia