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.
Simple solution, three ounces in ten gallons of water. For mildew in greenhouses, on rose bushes and other ornamentals.
Resin, two pounds; sal-soda (crystals), one pound; water, one gallon. Boil until of a clear brown color, i.e. from one to one and a half hours. Cook in an iron kettle in the open. Add this amount to fifty gallons of bordeaux. Useful for onions, cabbage, and other plants to which spray does not adhere well.
Dissolve one pound of pure sulfate of copper in twenty-five gallons of water. A specific for peach leaf-curl. Apply once before buds swell in the spring. Cover every bud. For use in preparing bordeaux mixture. Costs from 5 to 7 cents a pound, in quantity.
A greenish granular crystalline substance. Dissolve one hundred pounds in fifty gallons of water. For mustard in oats, wheat and the like, apply at the rate of fifty gallons an acre. Also for anthracnose of grapes as a dormant 3pray.
Should be 99 per cent pure. Valuable for surface mildews. Dust on dry or in the greenhouse used in fumes. Evaporate it over a steady heat, as an oil-stove, until the house is filled with vapor. Do not heat to the burning point, as burning sulfur destroys most plants. To prevent burning, place the sulfur and pan in a larger pan of sand and set the whole upon the oil-stove.
On fir causing swellings, cankers, and witches' brooms. Control. Prune off all affected parts.
See under Hollyhock.
Remove variegated leaves and their shoots, keep in dark and remove any further variegated leaves; then the plant should remain green.
Distorts branches and twigs.
Prune off diseased parts.
Catalogue of Diseases, continued.
Black tar-like spots on upper side of the leaves.
Burn all old leaves in fall or winter.
Maples suffer commonly from a drying up of the foliage, due to over-transpiration of water at times when hot winds occur.
See under Ampelopsis.
Irregular spots develop rapidly, the larger part of the leaf being involved. Leaves fall prematurely.
Spray with bordeaux mixture, beginning when the leaves are about half-grown and repeating the process every three weeks.
Grayish, more or less circular dead patches, ranging from 1/2 to 1 inch in diameter.
Remove and burn diseased leaves.
See under Onion.
See Peach Blight.
See under Peach.
Clumps of small tubercles on the roots. Not important.
Broom-like tufts of branches and irregular deforming and contortion of fruits.
See under Peach Leaf-Curl.
See under Verbena. Disease very similar.
White "Rust" or Mildew (Albugo bliti) - See similar disease under Radish.
Rust (Gymnosporangium sp.) - Orange rust spots on leaves.
Keep junipers at a considerable distance.
Thick twisted broom-like growth of branches.
Cut out the brooms. Ampelopsis.
See under Grape.
Powdery mildew growths on upper side of leaf.
Dust with sulfur.