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.
Rotation of crops.
A small, pale yellowish green leaf-hopper punctures the leaves, causing, the disease, curly top. Present in the western states.
No satisfactory treatment known.
Small grayish brown bugs, 1/16 inch in length. Destructive to sugar beets grown for seed.
Contact insecticides; clean cultivation.
A dull brown beetle with striped wing-covers. Both larvae and adults feed on the sugar beet, often in immense numbers.
Same as for Flea-Beetles.
A beetle closely allied to the larger beet leaf-beetle, feeding on the leaves, leaving only the veins.
Same as for Flea-Beetles. See Potato.
A large caterpillar about 1 1/4 inches long when mature, olivaceous to greenish in color, broadly striped with lighter green; defoliates the plants.
See Army Worm, Corn.
Pale yellowish green caterpillars striped with lighter green, about 3/4 inch long, frequently defoliate the plants in certain regions.
Destroy all weeds. Spray with arsenate of lead.
Small, greenish yellow lice attacking the leaves and young growth.
Tobacco extract or kerosene emulsion.
A small, yellowish plant-louse occasionally abundant on the under side of birch foliage (cut-leaf varieties).
"Black Leaf 40" tobacco extract three-fourths of a pint to one hundred gallons of water.
Small, whitish larvae skeletonizing the leaves.
Arsenate of lead, six pounds in one hundred gallons water.
Slender, flattened yellowish white grubs, 3/4 inch long when full-grown, burrow under the bark on all parts of the tree. The top branch usually dies first and is the first indication that the tree is infested.
Cut down and burn all infested trees immediately to prevent spread to other trees.
See Apricot. Occurs in California on birch.