CL 71
ActiveOryza sativa L. · Rice
ENTE NAZIONALE RISI
IT
5 records
Diseases
Rice blast
Pyricularia oryzae
Rice blast is a dangerous fungal disease of rice that affects all above-ground plant organs and can destroy up to 100% of the crop. The disease manifests in leaf, node, and panicle forms, causing necrosis and tissue death.
Mentioned in descriptions 470 varieties reference book.
Rice blast affects all above-ground organs of rice, including leaves, nodes, stems, and panicles, manifesting as characteristic grayish-green spots that eventually become silvery-white with a dark border. In the nodal form of the infection, stems turn black, while the panicle form results in spikelet sterility and the formation of shriveled grain, leading to critical crop losses during epiphytotic periods.
The development of the pathogen depends directly on environmental conditions, requiring temperatures in the range of 26–28 °C and high relative humidity above 89% for active spread, provided there is prolonged moisture on the leaf surface. The infection persists in plant debris and seeds, becoming active when favorable climatic factors occur.
Cultivar resistance is provided by specific R-genes that trigger plant defense responses through local tissue necrotization around the infection site. Breeding is focused on pyramiding multiple resistance genes; however, the effectiveness of protection may decrease due to the high adaptive variability of the fungus and the emergence of new virulent races in cultivation regions.
The evaluation of cultivar resistance in variety trials is conducted comprehensively using artificial infection backgrounds, molecular genetic markers for R-gene identification, and international disease severity scales. Environmental testing is of great importance, as it allows for the assessment of genotype reaction stability in various agrolandscape zones.
Breakdown by crop
Found in these crops
Varieties that feature this in their description
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
CL 26
ActiveOryza sativa L. · Rice
ENTE NAZIONALE RISI
IT
5 records
Vasco
ActiveOryza sativa L. · Rice
LUGANO LEONARDO SRL
IT
6 records
Musa
ActiveOryza sativa L. · Rice
Sardo Piemontese Sementi Soc. Coop. Società Agricola
IT
6 records
Meco
ActiveOryza sativa L. · Rice
SECE SAS
IT
6 records
Guadiagran
ActiveOryza sativa L. · Rice
INSTITUTO HISPANICO DEL ARROZ, S.A. (HISPARROZ)
ES
7 records
Gloria
ActiveOryza sativa L. · Rice
LUGANO LEONARDO SRL
IT
6 records
Zena
ActiveOryza sativa L. · Rice
S.I.S. SOCIETA' ITALIANA SEMENTI
IT
PT
5 records
Thaibonnet
ActiveOryza sativa L. · Rice
CALIF.CO.RICE
ES
IT
6 records
Cripto
ActiveOryza sativa L. · Rice
EN.N.RISI
ES
IT
5 records
Winter Star 3
ActiveLolium multiflorum Lam. · Italian ryegrass
PGG Wrightson Seeds South America
IT
8 records
Vulcano
ActiveOryza sativa L. · Rice
Sardo Piemontese Sementi Soc. Coop. Società Agricola
IT
5 records
Teti
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
6 records
Teseo
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
5 records
Sprint
ActiveOryza sativa L. · Rice
ZELENSKIJ GRIGORIJ LEONIDOVICh / LOS' GALINA DANILOVNA / ALEShIN EVGENIJ PAVLOVICh / TRET'YaKOV ALEKSANDR RYuRIKOVICh / SEMENOVA LARISA MIHAJLOVNA
IT
4 records
Ninfa
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
5 records
Nerone
ActiveOryza sativa L. · Rice
LUGANO LEONARDO SRL
IT
5 records
Mirko
ActiveOryza sativa L. · Rice
LUGANO LEONARDO SRL
IT
5 records
Medea
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
5 records
Mare CL
ActiveOryza sativa L. · Rice
Sardo Piemontese Sementi Soc. Coop. Società Agricola
IT
5 records
Giano
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
5 records
Giglio
ActiveOryza sativa L. · Rice
S.I.S. SOCIETA' ITALIANA SEMENTI
IT
5 records
Fedra
ActiveOryza sativa L. · Rice
Almo S.p.A.
IT
5 records
Eurosis
ActiveOryza sativa L. · Rice
S.I.S. SOCIETA' ITALIANA SEMENTI
IT
6 records