How do you treat gray leaf spots?
How do you treat gray leaf spots?
Management Tips
- Reduce thatch layer.
- Irrigate deeply, but infrequently.
- Avoid using post-emergent weed killers on the lawn while the disease is active.
- Avoid medium to high nitrogen fertilizer levels.
- Improve air circulation and light level on lawn.
- Mow at the proper height and only mow when the grass is dry.
Will GREY leaf spot go away on its own?
Gray leaf spot looks like someone burned or dripped acid on the leaves of the plant. There are little oblong spots on the leaf. Eventually, these spots grow together and the leaf blade dies. Whole areas of your grass can disappear at once when these leaf blades die.
What causes GREY leaf spot?
Gray leaf spot of St. Augustinegrass is a disease caused by a fungus that is common during extended periods of hot, humid weather. Newly sprigged, sodded, or rapidly growing grass is more susceptible than wellestablished grass.
What is the disease of sorghum?
| Fungal diseases | |
|---|---|
| Smut, loose kernel | Sporisorium cruentum = Sphacelotheca cruenta |
| Sooty stripe | Ramulispora sorghi |
| Sorghum downy mildew | Peronosclerospora sorghi = Sclerospora sorghi |
| Tar spot | Phyllachora sacchari |
How do you get rid of leaf spot?
- Live with the disease. Most trees tolerate leaf spots with little or no apparent damage.
- Remove infected leaves and dead twigs.
- Keep foliage dry.
- Keep plants healthy.
- Use fungicides if needed.
- Replace the plant.
Is gray leaf spot a foliar disease?
Gray leaf spot is typically the most serious foliar disease of corn in the U.S. corn belt, although other diseases can be more important in areas and years where weather conditions do not favor gray leaf spot. Gray leaf spot requires extended periods of high humidity and warm conditions.
What are the common pests and diseases of sorghum?
Major pests of sorghum
- Helicoverpa armigera.
- Sorghum midge – Stenodiplosis sorghicola.
- Soil insects.
- Cutworms – Agrostis spp.
- Black field earwig – Nala lividipes.
- Armyworms.
- Corn aphid – Rhophalosiphum maidis.
- Rutherglen bug (RGB) – Nysius vinitor.
What are the uses of sorghum?
Uses of sorghum as cattle feed, poultry feed, and potable alcohol, besides its traditional uses as food and fodder, are established. Primarily sorghum grain is used in distilleries, starch industry, and animal feed sector. Special properties of sorghum have been noted with a prospect of utilization in other sectors.
What does fungal leaf spot look like?
Spots are most often brownish, but may be tan or black. Concentric rings or dark margins are often present. Fungal bodies may appear as black dots in the spots, either in rings or in a central cluster. Over time, the spots may combine or enlarge to form blotches.
What causes spots on the leaves of sorghum?
Bacterial leaf spot or Bacterial Leaf Stripe can infect sorghum, but usually only results in cosmetic leaf lesions, not economic losses. These illustrate Bacterial Leaf Stripe. Zonate Leaf Spot of Sorghum, also called Copper Spot on many other grasses, is caused by the pathogen Gloeocercospora sorghi D. Bain & Edgerton.
Are there any diseases that affect grain sorghum?
Grain sorghum can be affected by a wide variety of diseases, which can cause serious losses of production and profitability. Some diseases occur across a wide area, at levels that do not cause extreme concern in any given field, but may add up to a considerable net loss due to their prevalence.
What do the racemes on a sorghum plant look like?
The inflorescence of the plant consists of racemes of spikelets arranged on branches at the head of the plant. The spikelets are paired and have 2 florets.
Where does sorghum grow in the United States?
In 1996, the disease was prevalent in parts of western Texas, but occurred sporadically across the sorghum producing areas of the United States and northern Mexico. Today, this disease is present in many humid areas where sorghum is grown and is favored by moderate temperatures (60 to 80 F).
How do you treat gray leaf spots? Management Tips Reduce thatch layer. Irrigate deeply, but infrequently. Avoid using post-emergent weed killers on the lawn while the disease is active. Avoid medium to high nitrogen fertilizer levels. Improve air circulation and light level on lawn. Mow at the proper height and only mow when the grass…