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.
Thorough spraying with "Black Leaf 40" tobacco extract, three-fourths of a pint in one hundred gallons water, adding four or five pounds of soap.
'A pale green looping caterpillar, striped with lighter lines, over 1 inch in length when mature. Especially destructive to late cauliflower.
Very difficult to poison. Some growers dust the plants with pure paris green, using a blower.
A small white maggot, the larva of a small fly, eating into the crown and roots of young cabbage, cauliflower, radish, and turnip plants.
Carbolic acid emulsion diluted with thirty parts of water, applied the day following the transplanting of the cabbage plants, and repeated once a week for several applications. Remove a little earth from about the plants, and spray on the emulsion forcibly. Better results may be secured by using tightly fitting cards cut from tarred paper. In seed-beds, protect the plants by surrounding the bed with boards 1 foot wide placed on edge, across which a tight cover of cheese cloth is stretched.
The green caterpillars hatch from eggs laid by the common white butterfly. There are several broods every season.
If plants are not heading, spray with kerosene emulsion or with paris green to which the sticker has been added. If heading, apply hellebore.
Cutworms. - See Corn.
A pale green, active caterpillar, about 1/3 inch in length when mature, feeds on the under sides of the leaves. Pupates in an open-work silken cocoon on the leaves. Destructive to late cauliflower.
Same as for cabbage looper.
Bug about 1/2 inch long, gaudily colored with orange dots and stripes over a blue-black ground, feeding upon cabbage; two to six broods.
Hand-picking. Place blocks about the patch, and the bugs will collect under them. In the fall make small piles of the rubbish in the patch, and burn them at the approach of winter. Practise clean culture. Destroy all cabbage stalks and other cruciferous plants in fall. Early in the spring, plant a trap crop of mustard, radish, rape, or kale. When the overwintering bugs congregate on these plants, destroy them with pure kerosene or by hand.
A yellowish bug resembling the common squash stink bug (Anasa tristis), feeding on the joints of opuntia, causing small circular discolored areas and destruction of the plants.
Destroy young with gasolene torch. In winter, burn trash in which adults are hibernating.