Title: Apple growing in California
Identifier: applegrowinginca178alle (find matches)
Year: 1951 (1950s)
Authors: Allen, F. W. (Frank Wisdom), 1887-1982
Subjects: Fruit-culture; Apples
Publisher: [Berkeley : College of Agriculture, University of California]
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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Woolly apple aphid infestation on apple twig. Photo courtesy of E. O. Essig. What to look for. As the names imply, aphids are small insects either green, reddish, or whitish (in the case of woolly types) insects. They are usually present in groups (see photo). Control of aphids is best obtained by a dormant spray of 2.5 gallons of dormant oil emulsion plus 1 pound of dinitro phenol (or 1 quart of 30 per cent dinitro cresol) per 100 gallons of water. This spray destroys the rosy and green apple aphid in the egg stage, and reduces the overwintering colonies of woolly aphid. To control woolly aphids that attack the roots a different method is used. In the fall, when the soil is dry and warm, level the soil around the base of the tree. Apply from % to 1 ounce of paradichlorobenzene (PDB) around the tree in a circle about 2 inches wide, with the inside of the circle 2 to 4 inches from the trunk. Cover the PDB with soil to a depth of 2 to 4 inches, and pack it down with a few pats of the shovel. The PDB crystals will give off a vapor that will penetrate the soil and kill the aphids. FRUIT TREE LEAF ROLLER, Archips argyrospila (Walker), attacks the foliage and young fruit soon after the buds open in the spring. What to look for. These insects may be identified by their characteristic method of tying leaf clusters together and feeding on immature fruit and foliage. In the winter their presence may be noted by A close view of San Jose scale. Photo courtesy of E. O. Essig. the smooth, flat, grayish egg masses found on the bark and limbs. Control is obtained with DDT spray. The first codling moth spray (see page 1) will also control leaf rollers. TUSSOCK MOTH, Hemerocampa vetusta Bdv., is more commonly known as the horned caterpillar. It is in the cater- pillar stage that it does damage to both foliage and fruit. What to look for. This pest is brilliantly colored, clothed with tufts of black and white hair. White, felty egg masses may be found during the winter on the trunk and limbs of the trees. Control is obtained with the DDT spray used against codling moth. ORANGE TORTRIX (skin worm), Ar- gyrotaenia citrana, is seasonally serious in the coastal areas where it feeds on the surface of the fruit and at the stem and blossom ends. What to look for. The adults deposit flat, yellowish egg masses on the trunks, limbs, and foliage. The larvae tie clusters of leaves together with silk and feed on the fruit and foliage under the protection of this covering. NOTE: The DDT spray recommended for codling moth, as described on page 1, will also give good control of fruit tree leaf rollers, tussock moth and leafhoppers. Substitute DDD in the spray to control orange tortrix. SECTION Vl-Page 3

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