Chlorothalonil, Trifloxystrobin, and Mancozeb Decrease Anthracnose Symptoms on Three Cultivars of Wintercreeper Euonymus

Autor: James T. Cole, Janet C. Cole, Kenneth E. Conway, Stephanie L. Schupbach-Ningen
Rok vydání: 2006
Předmět:
Zdroj: HortTechnology. 16:211-215
ISSN: 1943-7714
1063-0198
DOI: 10.21273/horttech.16.2.0211
Popis: ADDITIONAL INDEX WORDS. Colletotrichum gloeosporioides, Euonymus fortunei, fungicide, chemical control, leaf spot, stem lesion SUMMARY. The effectiveness of chlorothalonil, mancozeb, and trifloxystrobin applied alone or in rotations of two or three fungicides to control anthrac- nose symptoms caused by Colletotrichum gloeosporioides was evaluated on three cultivars of fiand container-grown wintercreeper euonymus (Euonymus fortunei) during the 2001 growing season. Studies were conducted at Stillwater, Okla.; Fayetteville, Ark.; and Park Hill, Okla. Rooted cuttings of wintercreeper euonymus 'Emerald Gaiety', 'Emerald 'n Gold', and 'Emerald Surprise' were transplanted from 1-gal plastic containers into fi eld soil at the Oklahoma State University Nursery Research Station and at the University of Arkansas Horticul- ture Farm on 10 May 2001. In a parallel study, recently transplanted rooted cut- tings of the same cultivars in 1-gal pots containing substrate consisting of pine bark and sand were placed in a shadehouse under 30% shade at Stillwater and Fayetteville and 73% shade at Park Hill on 11 May 2001. 'Emerald Gaiety' had fewer disease symptoms than 'Emerald 'n Gold' or 'Emerald Surprise' in the fi eld and in containers at Stillwater and Fayetteville. At Fayetteville, mancozeb ap- plied alone or in rotation with chlorothalonil or trifl oxystrobin provided better anthracnose control than treatments without mancozeb, but no fungicide elimi- nated anthracnose symptoms. Application of fungicides in rotations that include mancozeb and use of resistant cultivars can help decrease anthracnose symptoms.
Databáze: OpenAIRE
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