Over the course of the next four years, each disease below will be a focus in the RosBREED project. Each disease will be covered in greater detail in our Rosaceae Nemesis articles, which will be linked to the images below.

An important part of phenotyping our crop reference sets in RosBREED is providing common pathology protocols and verification of these sources of purported resistance for each crop. For each disease that has an available protocol for assessing resistance, details are available by selecting the appropriate image, below.

 

Current State of Disease Resistance

Crop Common Name Source of Resistance QTLs of Interest
Peach

Bacterial Spot

‘Clayton’, Prunus persica

G1XapF, G6XapF

Cherry

Leaf Spot

Prunus canescens

G4

Sweet Cherry

Powdery mildew (foliar)

PMR-1 (P. avium)

LG 5

Strawberry

root and crown rots (Phytophthora cactorum, Macrophomina phaseolina, Colletotrichum spp.,Fusarium oxysporum, Verticillium dahlia)

Fragaria virginiana, Fragaria chiloensis, Fragaria x ananassa

Pc1 for P. cactorum, and Cg1 for Colletotrichum spp. (Verification in progress)

Strawberry

Bact. angular leaf spot (Xanthomonas fragariae)

Fragaria virginiana

Xf1

Rose

Black Spot

Rosa wichuriana cv. Basye’s Thorneless.

Unknown

Prunus Rootstock

Armillaria root rot

Potential: Prunus maackii

Unknown

Pear

Fire Blight

‘Roi Charles de Wurtemburg’ (syn. ‘König Karl von Wurtemburg’), 'Old Home', and Pyrus ussuriensis Maxim (Illinois 76)

LG2 of ‘Moonglow’ (‘Roi Charles de Wurtemberg’ source)

Peach

Brown Rot

 ‘Bolinha’, Prunus persica 

Unknown

Apple

Fire Blight

Malus floribunda 821 via Purdue-Rutgers-Illinois cultivars, 'Splendour'

LG12, LG2, LG6, LG15; Unknown from 'Splendour'

Apple

Blue Mold

Malus sieversii PI13981

LG3

Apple

Scab

Honeycrisp, Malus floribunda 821, Wildung

LG1, LG15, Rvi6 (aka Vf), Unknown from Wildung