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.
Spray with arsenate of lead while the beetles are feeding on the leaves. The beetles may be jarred down on sheets, as with the plum-curculio. Bag the clusters.
The small white grubs feed upon the roots, often killing the vines in a few years. The adults are small grayish brown beetles that eat peculiar chain-like holes in the leaves during July and August.
Cultivate thoroughly in June, especially close around the vines to kill the pupae in the soil. At the first appearance of the beetles, spray the plants with arsenate of lead at the rate of eight or ten pounds in one hundred gallons of water, to which should be added one gallon of molasses.
Larva, about 1/2 inch long, yellowish green with black points, feeding upon the leaves; two broods.
Larva, about 1/4 inch long, feeding on the berry, often securing three or four together by a web; two broods.
Spray with arsenate of lead before blossoms open. Repeat after blooming and again in early July. Destroy wormy berries in August.
Beetle, of a blue metallic color, about 1/4 inch long, feeding upon the buds and tender shoots in early spring.
Arsenicals to kill the grubs on leaves during May and June. The beetle can be caught by jarring on bright days.
Larva 1 1/2 inches or less long, working in the roots.
Thorough cultivation during June and July.
Dig out the borers.
A large larva, 2 inches long when mature, green with yellow spots and stripes, bearing a horn at the posterior extremity, feeding upon the leaves, and nipping off the young clusters of grapes; two broods.
Catalogue of Insects, continued.
Hand-picking. Arsenicals early in the season. There are other large sphinx caterpillars which feed upon the foliage of the vine and which are readily kept in check by hand-picking and spraying.
These small yellowish leaf-hoppers, erroneously called "thrips," suck the sap from the under side of the leaves, causing them to turn brown and dry up.
Spray the under side of the leaves very thoroughly with one gallon "Black Leaf 40" in 1,000 gallons of water about July 1, to kill the young leaf-hoppers. When using tobacco extract, add about two pounds soap to each fifty gallons to make it spread and stick better. Repeat the application in a week or ten days. In houses, tobacco smoke, pyrethrum poured upon coals held under the vines, syringing with tobacco-water or soapsuds.