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 soap solution.
A grub 3/4 inch long, boring into the crown and roots. It also attacks wild docks.
Burn all infested plants and keep down the docks. Hand-picking.
Larva, l/2 inch long, dull greenish yellow, feeding on leaves; two broods.
A black and yellowish white grub about 1/4 inch in length, mining the leaves, causing blister-like spots.
Arsenate of lead the last of July to first of August.
Large, brownish yellow grub burrowing in the trunk, causing large ugly scars. The beetle is black prettily marked with yellow stripes and bands.
None known. Rose.
Tobacco extracts; syringe the plants in the morning, and two hours later syringe again with clean water.
Greenish plant-lice, attacking leaves and buds.
Tobacco extracts and soap solutions. Rose-Chafer, Rose-Beetle, or "Rose-Bug." - See Grape.
A very small hopper, white, often mistaken for thrips, living on the leaves of roses.
Whale-oil soap; kerosene; kerosene emulsion; dry pyrethrum blown on bushes when leaves are wet; tobacco extracts.
Small maggots, distorting leaf and flower-buds.
No satisfactory treatment known.
Soap solutions or tobacco extracts when young are hatching.
See Bramble Fruits.
Larva nearly 2 inches long, black, feeding upon leaves of willow, elm, and poplar two broods.
Sorbus. San Jose Scale
See Apple. Spinach.
Small maggot mining the leaves.
Clean cultivation to destroy its wild food plant
(lamb's quarters). Destroy all infested leaves. By raising spinach as an early or late crop, much of the damage can be avoided.