First Report of Solanum physalifolium as a Host Plant for Phytophthora infestans in Sweden

Plant Disease
B AnderssonB Jönsson

Abstract

In the early summer of 2003, lesions resembling those caused by Phytophthora infestans (Mont.) de Bary on potato were observed on Solanum physalifolium Rusby var. nitidibaccatum (Bitter) Edmonds (2) that was growing as a weed in a parsnip (Pastinaca sativa) field in southern Sweden. When infected leaves of S. physalifolium were observed under the microscope (×200 magnification), sporangia with the same shape and size as those of P. infestans were observed. Pieces of infected leaves of S. physalifolium were put under tuber slices of S. tuberosum (cv. Bintje) in petri dishes and kept at 20°C. After 4 days, mycelium grew through the slices and sporulated profusely. The sporangia on the slices were of the same shape and size as those observed on the infected S. physalifolium leaves. In Sweden, the ratio of A1 and A2 mating types of P. infestans is 50:50, and oospores are commonly found in infected potato crops (1), so isolates from S. physalifolium were tested for mating type by growing them together with reference isolates of a known mating type on agar plates. Nine of the tested isolates were A1 mating type and six were A2 mating type. One self-fertile isolate was found. Naturally infected leaves of S. physalifolium were incubate...Continue Reading

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