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GreenCast Korea - Leaf Spot

LEAF SPOTS

Caused by: Bipolaris sorokiniana (Sacc.) Shoemaker, Curvularia spp., Dreschlera spp.

Plate 1: Dreschlera siccans on perennial ryegrass

Description

병징은 병원균과 잔디 종유에 따라 다르다. 일반적으로 황화 또는 연녹색의 잎 가장자리가 관찰되며 반점 또는 병반이 관찰된다. 잔디가 앏아지거나 건조 피해처럼 보인다.
Symptoms depend on the grass species and the pathogen involved. Generally a yellowing or paling of the leaf blades may occur, accompanied with spots or lesions developing (Plate 1. Lesions may girdle the leaf and the portion above the girdle withers. The sward may thin or look drought stressed.

어디에 발병하는가? Where is leaf spot found?

Any area of turf, especially golf greens, tees, fairways, bowling greens, lawns, parks and sports pitches.

All grass species can be affected by leaf spots

언제 잔디에 잘 감염되는가?When is leaf spot likely to attack turf?

During the summer months, when the temperatures are high. Humid conditions encourage outbreaks.

진행 경과 Effects of leaf spot

Minor infection may result in lesions on leaves but no other effects

Severe infection may thin the sward, cause dieback and leave patches with weak turf, affecting the aesthetic value and the playability of the turf

감염되기 쉬운 조건 High risk situations

Leaf spots occur in mild and warm temperatures (around 20ºC). As the temperature increases (25 - 35ºC) blighting and melting out occurs.

High fertility

Moist conditions

Cutting heights lower than recommended for the grass species

Excessive thatch layers

 

IPM

The removal of excess thatch and use of a higher mowing height can reduce occurrence of disease.

Fungicidal control

헤리티지의 효과가 우수하였다.Trials in the USA have shown Heritage control of bipolaris sorokiniana, Curvularia spp. and Dreschleraspp.