This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
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.
See under Orchids.
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.
See under Peach.
See under Peach.
See under Verbena. Disease very similar.
Sunken black spots on leaves and stems.
Remove and burn diseased parts. Artemisia.
See under Carrot.
Irregular bleached patches on leaves and leaf-stalks of A. maculatum.
Burn diseased plants.
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.
Large, irregular, bleached spots with black streaks running across.
Remove diseased leaves.
Brown rust of leaves.
Eradicate the affected leaves.
Young leaves suffer from spring frosts.
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.
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.
Leaf-blades droop, turn yellow; petioles decay, letting leaves drop, and finally whole plant rots to the ground.
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.
Large papery spots on leaves and watery spots on pods.
As for Anthracnose.
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.
See under Nicotiana. Berberis.
Orange-colored rust spots on under side of leaf.
Round spots with blackish margin.
See under Fagus.
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.
See under Raspberry.
See under Dewberry. Same disease. Blueberry.
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.
See under Cabbage. Buxus.
Twigs killed, reddish pustules appearing on stems and leaves.
Remove all diseased parts and burn.
(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.
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.
Sometimes a serious disease.