M19 H2o [(F)]

Nakatani, Naoki

doi:10.1007/10552342_136

Cited by 1 publication

(1 citation statement)

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“…trast to matUre rootstocks, which normaJly arc killed over an extended period. Although they did not monitor nursery infections, Nakatani et al (8) and Fujita et 31. pJe and pear cultivars infected by D. IQlUl. kae in Japan (3,7,9,13,18), and plum culti-VMSinfected by D. perniciosa jn Britain (2,5).…”

Section: Discussionmentioning

confidence: 99%

A New Canker Disease of Apple, Pear, and Plum Rootstocks-Caused byDiaporthe ambiguain South Africa

Smit¹,

Viljoen²,

Wingfield³

et al. 1996

Plant Dis.

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Diaporthe ambigua was found to be the c:J.useof a newly recognized disease of apple. pear, and plum rootstocks in South Africa. The fungus was isolated from margins of cankers on rootstocks and branches of diseased trees, and from spores taken from perithecia and pycnidia imbedded in cankers. Characteristic symptoms included sunken, pointed lesions with marginal longitudinal cracks. Key identifying characters were perithecia, separate or in groups, with elongated necks protruding from the bark under moist conditions. and stromata delimited at the outer margins by broad, blackened zones. Pathogenicity tests were conducted on 3-year-old apple. pear, and plum rootstocks. Vegetative compatibility (YC) groups were identified by pairing isolates on oatmeal agar, and the sexual system was studied by inoculating single ascospores onto sterile apple twigs on water agar medium. D. ambigua was consistently associated with cankers on apple, pear, and plum rootstocks, and testing of Koch's postulates demonstrated its pathogenicity conclusively. The fungus was found to be homothallic. In addition, isolates from one rootstock tended to be of the same VC group, whereas those from adjacent rootstocks usually represented different genetic entities.

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Section: Discussionmentioning

confidence: 99%