Anemone. Root-Decay (Sclerotinia Tuberosa)

Rhizomes decayed and large lumps form on the outside.


Eradicate affected rhizomes and the cup-like fungous bodies near such plants.


Several rusts attack species of Anemone.

Anthurium. Blight (Glomerella Cincla)

See under Orchids.

Apple. Blight

The same disease as Pear Blight, which see.


Smooth cankers in bark of trunk or limbs usually indicate blight (Bacillus amylivorus); rough ones, New York apple-tree canker (Sphaeropsis malorum), or the nail-head canker (Numularia discreta).


As soon as noticed, cut away dead bark and wood to the living tissue and paint over with lead paint or coal-tar. Scab (Venturia inaequalis). - Olive-green, brownish or blackish scab-like spots on leaves and fruit.


Rake and burn or plow under old leaves very early in spring. Spray with lime-sulfur 32° Baume, 1-40, or bordeaux, 3-3-50: (1) when blossom buds show pink; (2) when majority of petals have fallen: (3) three weeks after 2, depending upon the weather; (4) if a late attack is feared, spray before fall rains begin.

Apricot. Yellows

See under Peach.

Black-Spot Or Scab

See under Peach.

Aquilegia. Mildew (Erysiphe Polygoni)

See under Verbena. Disease very similar.

Black-Spot (Bacillus Delphini)

Sunken black spots on leaves and stems.


Remove and burn diseased parts. Artemisia.

Rust (Puccinia Asteris). - Same Rust As On Asters, Which See. Artichoke. Soft-Rot

See under Carrot.

Arum. Leaf-Spot (Protomyces Ari)

Irregular bleached patches on leaves and leaf-stalks of A. maculatum.


Burn diseased plants.

Asparagus. Rust (Puccinia Asparagi)

A rust of the tops which is often so severe as to kill them, thus interfering with root-development.


Dust with flowers of sulfur about every three weeks while dew is still on in the morning. Use dusting-machines. Aspidistra.

Leaf-Blotch (Ascochyta Aspidistras)

Large, irregular, bleached spots with black streaks running across.


Remove diseased leaves.

Aster. Rust (Puccinia Asteris)

Brown rust of leaves.


Eradicate the affected leaves.

Aucuba. Freezing

Young leaves suffer from spring frosts.

Auricula. Leaf-Blotch (Heterosporium Auriculi)

Three or four olive-green spots on each leaf. Spots become brown and fall out.


Do not have excessive moisture. Spray with potassium sulfid and ventilate well. Avocado, or Persea. Anthracnose (Colletotrichum glaeosporioides).

See under Pomelo.

Catalogue of Diseases, continued.

Bamboo. Smut ( Ustilago Shiriana)

Internodes and tips of young shoots attacked. Wild and cultivated bamboo attacked in Japan.


Bordeaux mixture and sprinkling soil with lime before the shoots appear. Banana.

Rot (Bacillus Musae)

Leaf-blades droop, turn yellow; petioles decay, letting leaves drop, and finally whole plant rots to the ground.


Practise sanitation.

Bean. Anthracnose, Or Pod-Spot (Colletotrichumlindemuthianum)

Reddish brown, scab-like spots on stems, pods, and veins of leaves, particularly on yellow-podded snap beans. Fungus enters the beans.


Use seed only from pods without spots. Spray plants, from beneath and above, every ten days.

Blight (Bacterium Phaseoli)

Large papery spots on leaves and watery spots on pods.


As for Anthracnose.

Beet. Heart-Rot (Phoma Betae)

Leaves appear spotted late in July, then wilt, and finally a dry heart-rot appears.


Destroy affected plants. Practise long rotations. Treat seed with formalin, one pint in thirty gallons of water.


The same disease as Potato Scab, which see. Begonia.

Root-Rot (Thielavia Basicola)

See under Nicotiana. Berberis.

Rust (Puccinia Graminis)

Orange-colored rust spots on under side of leaf.

Betula. Leaf-Spot (Glaeosporium Betularum)

Round spots with blackish margin.

Heart-Rot (Fomes Igniarius)

See under Fagus.

Blackberry. Crown-Gall, Or Root-Gall (Bacterium Tumefaciens)

Swellings, hard or soft, on roots and stem below ground.


Plow up and burn all bushes in a diseased patch. Plant clean roots in a new place.


See under Raspberry.

Red Or Orange Rust

See under Raspberry.


See under Dewberry. Same disease. Blueberry.

Rust (Calyptospora Goeppertiana)

Stem attacked, swollen, spongy, at first pink, changing to brown and blackish. Plants taller than healthy and leaves dwarfed.


Segregate from species of fir and spruce.

Brassica. See under Cabbage.

Brussels Sprouts. Club-Root

See under Cabbage. Buxus.

Stem-Blight (Nectria Rousseliana)

Twigs killed, reddish pustules appearing on stems and leaves.


Remove all diseased parts and burn.

Cabbage Club-Root, Or Club-Foot

(Plasmodiophora brassicae) - A contorted swelling of roots and sickly wilted tops.


Destroy affected seedlings. Lime the soil at least eighteen months before planting cabbage, using at the rate of two tons of quicklime to the acre.

Black-Rot (Bacillus Campestre)

Sap-tubes in leaves and stem turn black and the leaves drop, thus preventing heading.


Practise crop-rotation. Soak the seed for fifteen minutes in a solution of mercuric chloride, one tablet in a pint of water. Cactus.

Spot (Diplodia Opuntiae)

Sometimes a serious disease.