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Diseases

Late blight

Phytophthora infestans

Late blight is a dangerous disease of solanaceous crops caused by an oomycete, which manifests as the appearance of spots on leaves, stems, and tubers. The development of the disease is triggered by high humidity and moderate temperatures, which can lead to significant crop losses.

Mentioned in descriptions 6 798 varieties reference book.

Affected plants develop dirty-brown spots, often accompanied by a whitish mold on the underside of the leaf, while elongated dark-brown spots appear on the stems. Tubers show hard, sunken brown spots, and the internal tissue exhibits a characteristic rust-brown discoloration upon cutting.

Epiphytotics develop under conditions of high air humidity around 90% and alternating warm days with cool nights. The presence of free moisture, such as dew or fog, is a critical factor for rapid spore germination, which allows the infection to spread across the field in 10–15 days.

In breeding, a distinction is made between specific vertical resistance, controlled by R-genes, and field horizontal resistance, which is considered more reliable due to its polygenic nature and ability to slow down pathogen development. Varieties are evaluated using a 9-point scale; however, the resistance level of the foliage does not always coincide with that of the tubers, requiring comprehensive analysis during variety testing.

Sources10

Breakdown by crop

Potato late blight 1 396 Tomato Late Blight 273 Phytophthora root rot of strawberry 99 Phytophthora Root and Stem Rot of Soybean 61 Phytophthora Root Rot of Alfalfa 41 Phytophthora blight of pepper 41 Apple Phytophthora Rot 24 Phytophthora Root Rot of Raspberry 21 Apple Phytophthora Rot 20 Tomato Late Blight 17 Citrus Phytophthora 17 Plum Phytophthora root rot 15 Phytophthora blight — hybrids between Citrus x aurantium L. x Citrus trifoliata L. 13 Strawberry Phytophthora root rot 13 Phytophthora Root Rot of Blueberry 11 Phytophthora root rot of sweet chestnut 9 Phytophthora blight — Leek 7 Phytophthora root rot of sour cherry 6 Phytophthora root rot of paradise apple 6 Avocado Phytophthora Root Rot 6 Peach Phytophthora Root Rot 5 Phytophthora root rot of Vaccinium 5 Late Blight of Eggplant 4 Phytophthora root rot of Prunus amygdalus x Prunus persica 4

Found in these crops

Potato 1 394 Tomato 276 Garden strawberry 124 Soybean 64 Bell pepper 56 Alfalfa 41 Red raspberry 34 Apple 26 Sweet chestnut 25 Citrus 22 Apple 19 Tomato 16

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.

Lady Claire

Active

Solanum tuberosum L. · Potato

Meijer C. B.V. (NL)

BG CZ FI GR HR HU +6
27 records

Latona

Active

Solanum tuberosum L. · Potato

ZPC Portugal

BG CZ EE ES FR HR +9
25 records

Daisy

Active

Solanum tuberosum L. · Potato

Lab. De Phys. Veget., Barberet Et Ducloux Et Cie

BG FR HU PL SK UA
29 records

Taurus

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

AT IT NL UA
33 records

Platina

Active

Solanum tuberosum L. · Potato

JANSEN A.

AT BE CZ DE EE FR +7
29 records

Innovator

Active

Solanum tuberosum L. · Potato

ZPC Portugal

BG CZ IT LT NL PL +2
32 records

Colomba

Active

Solanum tuberosum L. · Potato

ROCUS PIETER GRAVELAND

NL PL UA
32 records

Velox

Active

Solanum tuberosum L. · Potato

SAKA-RAGIS PFLANZENZUCHT GBR

AT BG CZ DE EE FI +6
28 records

Rodeo

Active

Solanum tuberosum L. · Potato

RIAN STEKELENBURG / F. BORN_ / MARTIN F. W. JANSEN KLOMP

EE FR GR HR IT LT +2
25 records

Fabula

Active

Solanum tuberosum L. · Potato

Kweekbedrijf D. Biemond B.V.

GR HR IT NL PL SI +1
27 records

Morene

Active

Solanum tuberosum L. · Potato

S.BRUNIA

BE CZ DE DK ES FR +5
29 records

Désirée

Active

Solanum tuberosum L. · Potato

ZPC

AT CZ DE ES FR HR +6
26 records

Carrera

Active

Solanum tuberosum L. · Potato

RIAN STEKELENBURG / F. BORN_ / MARTIN F. W. JANSEN KLOMP

CZ EE FR HR IT NL +3
26 records

Jelly

Active

Solanum tuberosum L. · Potato

Kartoffelzucht Böhm, Inh. Gebr. Böhm Kg.

BG CZ DE HR LU PL +2
29 records

Voyager

Active

Solanum tuberosum L. · Potato

Ytzen P. van der Werff

CZ FR GR IT NL SK
27 records

Ventana

Active

Fragaria x ananassa Duchesne ex Rozier · Garden strawberry

The Regents of the University of California

ES HU NL PL RO
30 records

Folva

Active

Solanum tuberosum L. · Potato

Lars Bach

AT BG CZ DE DK EE +8
25 records

Mozart

Active

Solanum tuberosum L. · Potato

RIAN STEKELENBURG / MARTIN F. W. JANSEN KLOMP / W. SANDERS / B. BORKHUIS

CZ HR IT NL PL SK +1
26 records

Chérie

Active

Solanum tuberosum L. · Potato

GERMIMCOPA BREEDING (GERMICOPA SAS)

DE FR HU PL SK UA
28 records

Sifra

Active

Solanum tuberosum L. · Potato

Rocus Pieter Graveland, Cornelus Johannus Biemond.

HR IT MT NL UA
25 records

Ukama

Active

Solanum tuberosum L. · Potato

Trip, J.

AT BE CZ DE DK ES +9
23 records

Saturna

Active

Solanum tuberosum L. · Potato

STADER| Stader Saatzucht eG

AT CZ DE EE FI FR +7
21 records

Laura

Active

Solanum tuberosum L. · Potato

Richard Schuchmann^^^Heinrich Böhm

BG CZ DE HR HU LT +4
25 records

Carlita

Active

Solanum tuberosum L. · Potato

JA Crebas (NL)

BE BG DE DK EE FR +6
20 records

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