Two-Lined Chestnut Borer (Agrilus Bilineatus)

Slender, flattened grubs, 3/4inch long when mature, burrowing under the bark and girdling the trees.

Treatment

-Cut and burn infested trees to prevent spread.

European Fruit Lecanium

See Plum.

Chrysanthemum. Green Aphis (Aphis Rufomaculata)

Small, green lice attacking the terminal shoots.

Treatment

Fumigation.

Black Aphis (Macrosiphum Sanborni)

Small, black lice attacking the terminal shoots.

Treatment

Fumigation.

Tarnished Plant-Bug

See Aster.

Chrysanthemum Leaf-Miner (Oscinis Sp.)

Works in the leaves.

Treatment

Hand-picking.

Cineraria. Leaf-Tyer

See Celery.

Citrus. Barnacle Scale (Ceroplastes Cirripediformis)

A large, dark brown scale covered with a waxy secretion 1/5inch in length. Surface of scale sculptured like a miniature barnacle.

Control

Resin wash or kerosene emulsion before the waxy covering is secreted.

Black Citrus Louse (Toxoptera Aurantix)

Small, dull black lice, curling the leaves and killing the new growth.

Control

Contact sprays before the leaves curl.

Black Scale (Saissetia Oleae)

A black, oval scale 1/4inch in diameter with an "H"-shaped mark on the back of the female. The young are light yellow to brown, unmarked. The scales secrete honey dew in which a fungus grows smutting the fruit.

Treatment

Fumigation. On citrus, use a half to three-fourths of regular dosage between September and January. On deciduous fruits and olive, water distillate, caustic soda mechanical mixtures or distillate emulsion may be used to kill scales less than one-half grown.

Citrus Red-Spider (Tetranychus Mytilaspidis)

Bright red, minute mite, frequently abundant on fruit and foliage.

Treatment

Dusting with sulphur or commercial lime-sulfur solution diluted 1-35 or 50 of water.

Citrus Thrips (Euthrips Citri)

Slender, minute, orange-yellow insects, less than one-thirtieth inch in length, scarring the fruit and injuring the foliage.

Treatment

Lime-sulfur solution one part in eighty parts water (likely to cause slight injury to foliage) or "Black Leaf 40" tobacco extract, one part in 1,800 parts water. Make four applications: (1) As the last of petals are falling; (2) ten to fifteen days later; (3) three to four weeks after the second; (4) during the months of August or September (for California). In greenhouses, fumigate with hydrocyanic acid gas.

Cottony Cushion Scale (Icerya Purchasi)

Red or yellowish scale insects with large, white, fluted, cottony masses which cover the eggs from 1/4 to 1/2inch in length.

Control

Natural enemies, principally by the common Vedalia.

Florida Red Scale (Chrysomphalus Aonidum)

Circular flat, brown scales, 1/16to 1/8 inch in diameter.