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Algae found in turf belong to the class Chlorophyceae, green algae. The algae that grow in soil are different from aquatic algae species and aquatic species can not live in terrestrial sites. Algae are unicellular organisms. The single cells will group together in either mats or filaments. Some species are mobile. When the single units of algae group together they form slippery mats which can prevent oxygen exchange in the soil. When the algae dry, the slippery |
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| scum mats, form a hard crust. Algae are not pathogens and do not directly infect the turf. Once algae is established, however, it will out-compete turf as long as the conditions favor the algae. Different species of algae have different pH requirements for establishment, and this is important in the control of algae. |
Algae are found throughout the United States and Canada.
| Integrated Pest Management Control Recommendations: |
Cultural Practices:
Algae, like moss, can out-compete turf in certain
growing conditions. The conditions that favor the algae must be altered
to encourage good turf growth. Algae can develop very quickly during extended
periods of overcast warm rainy weather. Aeration helps the turf in compacted
soils and also allows the surface to drain better. Avoid frequent shallow
watering. During establishment of new turf, watering should be monitored.
The frequent watering needed to germinate seed can encourage the establishment
of algae. Good air movement is also important and fans may be needed in
certain conditions to enhance air movement across the soil surface. The
pH of the soil should also be checked.
Herbicide
Use:
Apply your algae control to established algae that are actively growing,
but before crust formation. The application of iron or other pH-altering
materials can assist in creating an environment unfavorable to algae growth.
Fungicides can also be useful in the control of algae.
University Links | Gordon's Recommendations | Germination Dates
