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RESULTS

(10)

DISEASE: Pear decline

HOST: Pear

Healthy pear shoot (left) and diseased shoots (center and right). Leaves are reddish and growth is stunted.

DISEASE: Pear decline

HOST: Pear

Close-up of infected pear branch showing premature reddish coloration of leaves and cupped, stunted leaves.

DISEASE: Pear decline

HOST: Pear

Reduced growth of infected trees in center of image.

DISEASE: Pear decline

HOST: Pear

Psylla pyricola, the psyllid vector of pear decline phytoplasma.

DISEASE: Pear decline

HOST: Pear

'Bartlett' pears were grafted onto tolerant rootstock. All trees are infected. Note yellowish, diseased branches.

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.

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

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

DISEASE: X-disease (Western X) or buckskin

HOST: Cherry

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

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.