Yellow Tuft Flashcards
1
Q
Yellow Tuft Cause
A
– Sclerophthora macrospora
– Sclerophthora graminicola
2
Q
Yellow Tuft Hosts
A
– Festuca spp. – Lolium spp. – Poa spp. – Agrostis spp. – Stenotaphrum secundatum – Zoysia japonica
3
Q
Weed Hosts
A
• Weed hosts
– Crab, quack, and orchard grass
4
Q
Yellow Tuft Symptoms
A
Dime sized yellow spots Represent individual plants Die in the heat Dime sized dead spots Proliferation of shoots from single crown Thickened and stunted leaves Chlorotic leaf tissue Loss of true roots – abundant adventitious root growth “pointy crown”
5
Q
Yellow Tuft Signs
A
- Sporangia on undersides of the leaf blades
- Sporangia emerge through stomates
- Antheridia and oogonia
6
Q
Yellow Tuft moves with…
A
surface drainage
7
Q
Yellow Tuft Predisposing Factors
A
• Cool to– warm temperatures – zoospores swim longer at lower temperatures • Super saturated soils – poor drainage – excessive irrigation • Excess nitrogen
8
Q
Yellow Tuft Fertility Program
A
• Maintain a balanced fertility program – soil test and adjust sufficiency levels of available nutrients as necessary • Maintain adequate N inputs in season – 3 to- 5 lb. per 1000 ft2 • Mask the damage with N or iron
9
Q
General disease management
A
KEEP IT DRY!!!
• Remove tufts by hand or by verticutting
• Use irrigation judiciously; avoid drought, but keep
the foliage as dry as possible
• Prune to improve air circulation and light
• Improve surface and sub-surface drainage
• Mow at proper cutting heights
• Aerify to reduce thatch and compaction
• Use resistant varieties – shade tolerant
10
Q
Yellow Tuft Chemical Control
A
Drench Twice In Spring
Subdue, Subdue Maxx
• mefenoxam
• metalaxyl
