Rubli
TerminatedTriticum aestivum L. · Bread wheat
Dario Fossati
Diseases
Leaf spot diseases
Leaf spot diseases are a group of fungal, bacterial, or viral disorders manifesting as tissue necrosis in the form of spots of various shapes and colors. Pathogen development leads to a reduction in photosynthetic leaf area, tissue deformation, and significant yield losses.
Mentioned in descriptions 15 926 varieties reference book.
Leaf spot diseases represent a collective group of conditions caused by fungi, bacteria, or viruses. The primary diagnostic symptom is the formation of spots of various colors—brown, yellow, black, or gray—on the leaf blades, ranging from small dots to extensive necrotic lesions with or without margins. Infection often originates in the lower leaf canopy and, if allowed to develop, leads to premature defoliation and overall plant weakening.
Disease progression depends on a combination of favorable meteorological factors, such as moderately warm temperatures and high humidity, as well as the agrotechnical background. Improper crop rotation and the retention of crop residues in fields contribute to the accumulation of inoculum and intensive infection of crops in subsequent seasons. The severity of disease manifestation correlates directly with pathogen aggressiveness and the degree of cultivar susceptibility, which can lead to a 20–30% or greater reduction in crop productivity.
Cultivar resistance to leaf spots is a genetically determined ability to maintain productivity under disease pressure. It can be specific, targeting particular pathogen races, or non-specific polygenic, providing complex protection. Resistance mechanisms include physical barriers, such as waxy coatings, and biochemical responses. During variety testing, resistance is evaluated under natural and artificial inoculation conditions using scoring scales to record the degree of necrosis and pathogen development.
Breakdown by crop
Rose leaf spots
789
Tomato Leaf Spots
563
Barley Leaf Spot Diseases
541
Pepper Leaf Spots
277
Cucumber leaf spots
244
Leaf blotch — soft wheat
239
Leaf spots — Perennial ryegrass
181
Leaf spots — garden strawberry
141
Bean leaf spots
139
Leaf spots — tall fescue
125
Potato early blight
123
Peach Leaf Spots
120
Leaf spots of summer squash
107
Leaf Spot — Kentucky Bluegrass
105
Apple Leaf Spot
95
Maize leaf spots
82
Melon Leaf Spot
74
Olive leaf spot
71
Leaf spots — Creeping bentgrass
53
Carrot leaf blights
48
Leaf spots of red fescue
43
Maize leaf spots
35
Plum leaf spots
34
Triticale leaf spots
32
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.
Rubymine
ActivePhlox paniculata L. · Garden phlox
Van Gaalen Irenaeus Antonius Maria
Raspberry Truffle
ActiveHylotelephium telephium (L.) H. Ohba · Orpine
Janet N. Egger
Royal Gems
ActiveHibiscus moscheutos L. · Crimson-eyed rose mallow
Fleming's Flower Fields Inc.
Red Sun
ActiveGaillardia x grandiflora hort. ex Van Houtte · Blanket flower
Korlipara Harini
R265
Application submittedZea mays L. · Maize
CROOKHAM COMPANY
Piilag B2
ActiveLagerstroemia L. · Crape Myrtle
Kardos Joshua H.
PT261
ActiveBrassica napus var. napus · Rapeseed
PIONEER OVERSEAS CORPORATION
PH3GK
Protection expiredZea mays L. · Maize
PIONEER HI-BRED INTERNATIONAL
Piranha
ActivePrunus laurocerasus L. · Cherry laurel
Frank Schnupper
Peto 285
Protection expiredApium graveolens L. var. dulce (Mill.) Pers. · Celery
Seminis Vegetable Seeds
Muur
ActivePopulus L. · Poplar
Eigen Vermogen van het Instituut voor Natuur- en Bosonderzoek (EV-INBO)
Mutiny
TerminatedLactuca sativa L. · Lettuce
VILMORIN-MIKADO USA
Methyra
ActiveHypericum L. · St. John's wort
Marc Etienne
Merlot
ActiveEchinacea purpurea (L.) Moench · Purple coneflower
Korlipara Harini|Canby, OR, US
MVNC1902
ActiveCoreopsis grandiflora Hogg ex Sweet · Large-flowered tickseed
van Noort Marco
Noam Saul
ActiveHybrids between Echinacea purpurea (L.) Moench and Echinacea paradoxa (Norton) Britton
Saul Richard Gregg|Cleveland, GA, US
Little Darling
ActiveHelleborus L. · Christmas Rose
P.C.M. Olsthoorn Holding B.V.
Mary
ActiveKalanchoe blossfeldiana Poelln. · Flaming Katy
Knud Jepsen
Lemon Sorbet
ActiveVerbascum L. · Mullein
Korlipara Harini|Canby, OR, US
Kolmarfo
ActiveCotinus coggygria Scop. · European smoketree
Peter Rudolf Kolster
Lannorthdakota
ActiveMandevilla sanderi (Hemsl.) Woodson · Brazilian jasmine
Lannes Robert
Kolmagito
ActiveCotinus coggygria Scop. · European smoketree
Peter Rudolf Kolster
Little Flames
ActiveLeucothoe axillaris x Leucothoe fontanesiana
FA Duyndam V.O.F.