. Chemical control of woody plants in California. Woody plants; Herbicides. volume applications with a ground rig, successful control of all chaparral species is assured, but retreatment will be neces- sary. Although both manzanita and Ceano- thus species are sensitive to 2,4-D and 2,4,5-T and can be killed by either chem- ical, manzanita responds better to 2,4-D and Ceanothus to 2,4,5-T. Stands of ma- ture wedge-leaf Ceanothus have been killed by 2 pounds of 2,4,5-T in 4% gallons of Diesel oil per acre, applied by helicopter. Since chaparral generally consists of a mixture of shrubby species,
. Chemical control of woody plants in California. Woody plants; Herbicides. volume applications with a ground rig, successful control of all chaparral species is assured, but retreatment will be neces- sary. Although both manzanita and Ceano- thus species are sensitive to 2,4-D and 2,4,5-T and can be killed by either chem- ical, manzanita responds better to 2,4-D and Ceanothus to 2,4,5-T. Stands of ma- ture wedge-leaf Ceanothus have been killed by 2 pounds of 2,4,5-T in 4% gallons of Diesel oil per acre, applied by helicopter. Since chaparral generally consists of a mixture of shrubby species, it would seem desirable to spray them with a brush-killer mixture. Oak woodlands. The blue oak (sometimes called white oak) is the easiest California oak to kill with chemi- cals. Use 2,4-D amine and the cut-surface method, which is selective in that indi- vidual trees can be killed or an area thinned out. Table 2 (p. 18) presents data on the cut-surface method at dif- ferent times of year and indicates that November through June is the best period. Good control can be had at all times of year if the cuts are placed close together, near the base of the trunk, deep enough to reach well into the. Table 2. The effect of season of ap- plication of 2,4-D amine, 2 ml (V2 tea- spoon) per cut, on kill of blue oak trees.* Date of application Top kill Sprouting August, 1951 October, November, 1951. . December, 1951. February, 1952. . March, 1952 April, 1952 June, 1952 July, 1952 per cent 70 90 100 100 100 100 100 100 90 per cent 0 20 0 0 0 0 0 0 0 * The cuts were approximately 6 inches apart (center to center of the cuts) and 12 to 24 inches above the ground. A blue oak tree treated with the amine of 2,4-D in hatchet cuts. (John Allen ranch, Sutter Creek, Calif.) wood—and if enough chemical is applied. Aircraft spraying of blue oak trees has not so far resulted in a high degree of kill. The best kill (25 per cent) was in a test using 2 pounds of 2,4,5-T ester in 4% gallons of
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