For Pathologists
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.
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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 |