spot blotch

spot blotch

[′spät ‚bläch]
(plant pathology)
A fungus disease of barley caused by Helminthosporium sativum and characterized by the appearance of dark, elongated spots on the foliage.
References in periodicals archive ?
Mycoparasitic action of some fungi on spot blotch pathogen (Drechslera sorokiniana) of wheat.
Spot blotch (SB) caused by Cochliobolus sativus (Ito & Kurib.) Drechsler ex Dastur [anamorph: Bipolaris sorokiniana (Sacc.) Shoem.] is economically one of the most important fungal diseases of barley (Hordeum vulgare L.) throughout the world (Mathre et al., 2003).
Resistance against lodging, karnal bunt, stem rust (UG-99 a local race), spot blotch, rusts (Leaf rust = 10R to 30RMR and Yellow rust = 10R to 20MRMS, RRI value of 7.2-9.0 and 7.5-9.0 for leaf and yellow rusts, respectively) and high yield potential (6678 kg ha-1) are the major attributes of AaS-2011 that make it a superior variety for its target regions.
In the Midwest, NTNB, spot blotch, and SSLB are important foliar diseases of barley because they result in yield reductions ranging from 5 to 35% each year (Mathre, 1997; ToubiaRahme and Steffenson, 2004).
Wheat (Triticum spp.) is an important cereal crop, whose cultivation is often hampered by the foliar diseases, spot blotch caused by Bipolaris sorokiniana (Sacc.) Shoem.
Like most Midwest barley cultivars, Stellar-ND possesses the NDB112 resistance to spot blotch [caused by Cochliobolus sativus (Ito and Kuribayashi) Drechs.
Spot blotch of wheat caused by Bipolaris sorokiniana (Sacc.) Shoem has been a major disease of wheat grown under high humidity subtropical climate (Duveiller, 2002; Roshyara et al., 2009).
Currently, at least five QTLs for spot blotch resistance have been localized on chromosomes 1(7H), 2(2H), 3(3H), 5(1H) and 7(5H) (Bilgic et al., 2005; Steffenson et al., 1996).
Infection response caused by spot blotch was evaluated using a 1 to 9 rating scale, where a rating of 1 to 3 was indicative of a low compatibility, 4 to 5 was indicative of an intermediate compatibility, and 6 to 9 was indicative of high host-parasite compatibility (Fetch and Steffenson, 1999).