4.7 Article

Pathogenicity to ornamental plants of some existing species and new taxa of Phytophthora from irrigation water

期刊

PLANT DISEASE
卷 92, 期 8, 页码 1201-1207

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AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PDIS-92-8-1201

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integrated crop health management

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Eighteen isolates from 12 species of Phytophthora, including several new taxa. were tested for pathogenicity to six ornamental and four vegetable species. The following three inoculation methods were used depending on infection court targeted: vermiculite culture inoculation for roots, agar block inoculation for fruit, and zoospore inoculation for foliage. All six new taxa (P irrigata, P hydropathica, Dre III, Cil I, Cip-like, and Gon I) are pathogenic to one or more test plants. Specifically, taxon Cil I was identified as a growing threat to horticultural crops, particularly ornamental crops in container production nurseries. The potential host list of R tropicalis was expanded to four new families (Apocynaceae, Asteraceae, Begoniaceae, and Fabaceae) and one additional genus within each of three existing families (Ericaceae, Cucurbitaceae, and Solanaceae). New potential hosts were also identified for other existing species of Phytophthora. The practical implications of these results in crop health management programs for both ornamental and vegetable crops locally, and for development and implementation of agricultural biosecurity programs globally, are discussed.

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