Study on the pathogen of Zoysia spring dead spot (II)

On the outbreak of Rhizoctonia sp. separated from Zoysia spring dead spot and a few of other turf-disease by the methud of artificial infection

Abstract

1. Zoysia spring dead spot which occurred in our field showed restrainning effect by the anti-Rhizoctonia fungicides.
Rhizoctonia sp, is separated preferentially from this disease.
The symptom of this disease is similar to other disease by Rhizoctonia solani.
Then it was confirmed whether or not Rhizoctonia sp, which is separated from this disease possesses the pathogenicity to the turfgrass by the artificial infection method.
Also, it was tested whether or not Rhizoctonia sp, which is separated from the provisional name of Koraisiba Rhizoctonia hagarebyo (Zoysia Rhizoctonia leaf spot) and Bentgrass okkasyoku patch (Bentgrass yellowish brown patch) in Japanese name posseses the pathogenicity to each turfgrass.
2. Rhizoctonia sp. which is separated from Zoysia spring dead spot showed the pathogenicicity to Zoysia-grass and Bentgrass.
3. Rhizoctonia sp., also, which is separated from the provisional name of Koraisiba Rhizoctonia hagarebyo and Bentgrass okkasyoku patch showed the pathogenicity to each turfgrass.
4. Aboue-mentioned, 1 want to give the name of Zoysia Rhizoctonia spring dead spot (Koraisiba Rhizoctonia haruhagebyo in Japanese name) and Koraisiba Rhizoctonia hagarebyo (yellow patch in English name) to Zoysia spring dead spot and the provisional name of Koraisiba Rhizoctonia hagarebyo respectiuely.
About the name of the asssumed of Bentgrass Yellowish brown patch is required still more consideration.