Calathea. Leaf-Blight (Cephaleurus Parasiticus)

The epidermal cells contain the alga, which spreads over the leaf, blackening and killing it.

Control

Remove diseased leaves.

Calceolaria. Leaf-Blight (Ascribed To A Micrococcus)

Brownish patches on lower leaves, many times bordered by the small veins of the leaf.

Control

Burn Affected Plants. Campanula. Rust (Coleosporium Campanulas)

Red and brown rust spots on leaves.

Control

Segregate from Pinus rigida.

Capsicum. Anthracnose

Same as on Piper, which see. Carnation.

Rust ( Uromyces Caryophyllinus)

Brown, powdery pustules on stems and leaves.

Control

Spray once in two weeks with a solution of copper sulfate, one pound to twenty gallons of water. Pick off diseased leaves. Keep temperature low.

Carpinus. Black-Mold (Dimerosporium Pulchrum)

On leaves.

Control

Spray with any good fungicide.

Heart-Rot (Fomes Fulvus)

Red-brown decay; crumbles when crushed.

Control

Surgery methods. Carrot.

Soft-Rot (Bacillus Carotovorus)

A soft-rotting of the root identical with the soft rots of other root crops.

Control

Good drainage of soil. Steam sterilization of soil.

Leaf-Spot Or Early Leaf-Blight (Cercospora Apii)

See under Celery.

Carya

See under Hickory-Nut.

Castanea

See under Chestnut.

Catalpa. Leaf-Blight

Sudden blackening and dying of leaves in early summer.

Heart-Rot (Polystictus Versicolor)

Heart-wood becomes straw-colored and finally soft.

Control

Surgery.

Root-Rot Of Seedlings (Thielavia Basicola)

See under Nicotiana.

Cauliflower

See under Cabbage.

Catalogue of Diseases, continued.

Celastrus

Mildew (Phyllactinia corylea) - Powdery mildew of leaves.

Control

Dust with sulfur.

Celery. Early Leaf-Blight (Cercospora Apii)

A spotting and eventual blighting of leaves.

Control

Spray with ammoniacal copper carbonate, 5-3-50, beginning in seed-bed and keeping new growth covered throughout the season.

Late Blight (Septoria Petroselini variety Apii)

Blight of foliage appearing late in season and in storage.

Control

As above. Grow under half shade.

Celtis. Mildew (Peronoplasmopara Celtidis)

Definite spots on veins, water-soaked dark green becoming gray.

Control

Spray with bordeaux mixture.

Cercis. Leaf-Spot (Ascochyta Pisi)

Spots round, yellowish with brown margin on leaves and stem.

Control

Spray with dilute bordeaux mixture on first appearance.

Chamaecyparis. Twig Disease (Pestalozzia Funerea)

Bark of young branches killed, needles die.

Control

Prune off affected parts and clean up litter and burn.

Heart-Rot (Steccherinum Ballonii)

Kills tops of trees. Chard (Beta).

Leaf-Spot (Cercospora Beticola)

Brown, purplish bordered spots on leaves.

Control

Pick off and destroy diseased leaves.

Cherry. Brown-Rot (Sclerotinia Fructigena)

The flowers decay, the leaves become discolored with irregular brown spots, and the fruit rots on the tree.

Control

Spray with bordeaux mixture, 4 - 4-50, or lime-sulfur, 1-40 (1) just before the blossom buds open; (2) just after the blossoms fall; (3) one or two more applications at intervals of ten days.

Powdery Mildew (Podosphaera Oxycanthae)

Leaves and twigs affected, often causing defoliation.

Control

Spray with lime-sulfur, 1-40, or dust heavily with powdered sulfur.

Black-Knot

See under Plum. Same disease. Chestnut.

Canker, Or Bark Disease (Endothia Parasitica)

Sunken or swollen cankers on limbs or trunk. Limbs die and leaves and burs cling in winter.

Control

Remove diseased parts and burn. Paint all wounds. Little chance of saving trees in infested locality.

Chicory. Stem-Spot (Pleospora Albicans)

Yellowish-gray spots on lower portion of the stem. Later on smaller branches and leaves. Plant destroyed.

Control

Eradicate diseased plants.

Chrysanthemum. Leaf-Spot (Septoria Chrysanthemi)

Small dark brown spots, which increase in size until leaf is killed.

Control

Pick and burn affected leaves. Spray with bordeaux mixture, 4 - 4-50.

Rust (Puccinia Chrysanthemi)

Reddish brown rust pustules on leaves.

Control

As for Leaf-Spot.

Cineraria. Mildew (Bremia Lactucae)

Plants stunted and of a pale color, finally wilting. Same disease on lettuce.

Control

Remove diseased plants. Do not use same soil again.

Rust

See under Senecio.

Citrus

See under Orange, Lemon, Grapefruit, etc. The "wither tip" disease described under Pomelo is common to species of citrus. Clematis. Leaf-Spot (Cylindrosporium clematidis variety jackmanii).

Causing loss of lower leaves at times. Not serious.

Cocoanut. Bud-Rot (Bacillus Coli)

Rot of soft tissues of coconut plant and is perhaps responsible for coconut bud-rot.

Control

Not given. Coffea.

Leaf-Disease (Hemileia Vastatrix And H. Woodii)

Circular discolored areas, turning pale yellow and becoming studded with orange-yellow spots.

Control

Burn all diseased leaves.

Colchicum. Rust ( Uromyces Colchici)

Black spots on leaves. Looks like a smut disease.

Control

Diseased leaves should be burned.

Colocasia. Root-Rot (Peronospora Trichomata)

Sap-tubes turn yellow and finally entire tuber becomes black.

Control

Dry tubers thoroughly before storing. Do not plant in soil in which the disease has occurred. Convolvulus.

Mildew (Albugo Ipomozx-Panduranx)

Distortions and white or yellow blisters.

Control

Remove diseased plants and spray with bordeaux mixture frequently.