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Colonies on potato dextrose agar (PDA) grow to 50-60 mm diameter after 6 days at 22°C under 12 h light/12 h dark cycle. Colony margin even, sporogenous tissue slightly elevated above the colony surface, 1-2 mm, buff/pale luteous. Stromatal initials forming 10-12 days after culture initiation;mature black stromatal plates at first discrete, later coalescing. Macroconidia globose, ovoid or limoniform, smooth, 12-21 x 8-12 µm, mean = 16.4 x 10.1 µm in distilled water when grown on cherry agar (CHA) at 22° under NUV;11 x 20 x 8-11 µm, mean 14.9 x 9.1 µm, on pear fruit at 15°C. Thick hyphal layer of stroma on colonized fruit;conidial tufts buff to brownish-grey.

Related invasive species

  • Monilia polystroma

Related Farm Practice

  • Light
Impact

M. polystroma is the conidial form of an unknown apothecial ascomycete closely related to Monilinia fructigena, from which it has so far been distinguished by molecular means. Although M. fructigena and the other brown-rot species, M. fructicola and M. laxa, are known on various continents, M. polystroma was identified in Japan and initially known only in that country. Recent published reports placed it in Hungary and China as well. This species may be widely distributed in Asia and perhaps Europe. In the absence of natural barriers, it will spread by means of airborne conidia. Long distance dispersal would most likely occur through infected planting stock or fruit. Therefore, M. polystroma is a regulated pest for Canada. Monilinia fructigena is a regulated pest for the USA.

Has Cabi datasheet ID
34755
Symptons

M. polystroma causes the same or very similar symptoms to those reported for Monilinia fructigena and, therefore, is likely to be associated with blossom, twig and leaf blights, stem cankers and brown fruit rots (Byrde and Willets, 1977). For further information on symptoms, refer to the datasheet on M. fructigena.

Hosts


The type description by van Leeuwen et al. (2002) only dealt with isolates from apple (Malus pumila), and a recent discovery of the species in Hungary (Petróczy and Palkovics, 2009) was also on apple. Detailed studies on the potential host range of this species have not yet been conducted. However, according to previous work carried out on Japanese isolates, then identified as Monilinia fructigena (Harada, 1998), the fungus has a host range similar to M. fructigena in Europe, and is found on species of Cydonia, Malus, Prunus, and Pyrus.

Oss tagged
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