RESULTS

(8)

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DISEASE: Hairy root

HOST: Rose

Hairy root symptoms of many fibrous roots (right). Noninfected root (left).

Hairy root | Rose

DISEASE: Hairy root

HOST: Rose (Rosa sp.)

PATHOGEN: Agrobacterium rhizogenes

SOURCE: R. Raabe

DISEASE: Hairy root

HOST: Apple

Crown gall (left) and hairy root (right) caused by Agrobacterium tumefaciens and A. rhizogenes, respectively.

Hairy root | Apple

DISEASE: Hairy root

HOST: Apple (Malus domestica)

PATHOGEN: Agrobacterium rhizogenes

PATHOGEN SYNONYM: Rhizobium sp.

SOURCE: APS

DISEASE: Hairy root

HOST: Rose

Crown gall (left) and hairy root (right) caused by Agrobacterium tumefaciens and A. rhizogenes, respectively. Healthy root (center).

Hairy root | Rose

DISEASE: Hairy root

HOST: Rose (Rosa sp.)

PATHOGEN: Agrobacterium rhizogenes

PATHOGEN SYNONYM: Rhizobium sp.

SOURCE: M. Schroth

DISEASE: Rugose leaf curl

HOST: Clover

Two rugose, distorted white clover leaves and a healthy leaf. Rugose leaf curl is caused by an unidentified phloem-infecting bacterium.

Rugose leaf curl | Clover

DISEASE: Rugose leaf curl

HOST: Clover (Trifolium repens)

PATHOGEN: Phloem-infecting bacterium

SOURCE: D. Teakle

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Comparison of normal, dark cherries (in hand) with infected, immature cherries with less pigmentation.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: A. Purcell, M. Davis

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Healthy cherry shoot (left) and stunted shoot (right).

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: S. Thomson

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

Infected trees on 'Mazzard' rootstock (right) may live for years, producing fruit with symptoms. Trees on 'Mahaleb' rootstock (left) usually die rapidly in year of infection, about time of fruit ripening.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus avium)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: S. Thomson

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

X-disease causes undersized, yellowish fruit. Diseased branches turn rusty red near end of season. Some defoliation occurs on diseased branches.

X-disease (Western X) or buckskin | Cherry

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry (Prunus cerasus)

PATHOGEN: 'Candidatus Phytoplasma pruni'

PATHOGEN SYNONYM: Phytoplasma X-disease group

SOURCE: A. Jones