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  موضوع :Diseases شناسنامه بیماریهای گیاهی One of the best weapons against disease in turf's is to create a healthy plant. In almost every case, weeds, insects and disease seek

مهدی بنی حسن بازدید : 1232 شنبه 18 آذر 1391 زمان : 20:57 نظرات (0)
موضوع :Diseases شناسنامه بیماریهای گیاهی

 

DOWNY MILDEW

Turf Affected:

St. Augustine, Kentucky bluegrass, bentgrasses, ryegrasses, tall fescue and creeping red fescue.

Season:

Spring, early summer, and fall.

Conditions For Development:

Cool humid weather in the 60 to 70 degree range.

Early Symptoms:

White raised linear streaks that develop parallel to the mid-vein of the leaves.

Late Symptoms:

A fungal growth appears on the leaves and the tips of the leaf die. It can be confused with St. Augustine decline but it can be distinguished by less yellowing and more striping.

 

FAIRY RINGS

Turf Affected:

All lawn grasses.

Season:

Early spring to late fall.

Conditions For Development:

Introduced into new areas as bits of mycelium. Two to three years are required from the time of placement until the first-formed ring appears.

Early Symptoms:

Continuous circles of bands that are darker green and faster growing than the surrounding areas.

Late Symptoms:

Fruiting bodies of fungi appear. Usually called mushrooms, these structures may be quite abundant throughout the infected areas.

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