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RESULTS

(10)

DISEASE: Ash yellows

HOST: Ash

Ash sapling with basal sprouts and chlorotic leaves.

DISEASE: Ash yellows

HOST: Ash

Witches'-broom at base of declining tree.

DISEASE: Ash yellows

HOST: Ash

Forest of declining trees, some chlorotic and others with dieback.

DISEASE: Ash yellows

HOST: Ash

White ash with deliquescent branching.

DISEASE: Varnish spot

HOST: Lettuce

Leaf with large brown and small, shiny, dark brown necrotic spots that spread in size and later dry out.

DISEASE: Varnish spot

HOST: Lettuce

Advanced stage of disease with large, brown necrotic areas. They most often are along veins. Outermost leaves of the head usually are not affected.

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.