. Chemical control of woody plants in California. Woody plants; Herbicides. border. It is not related to true oaks, but to poison ivy, found in other parts of the United States. 2,4-D, 2,4,5-T, Animate, and amino triazole are all used in its control. Brush- killer mixtures of 2,4-D and 2,4,5,-T are more effective than either chemical alone. Since brush killers may injure nearby broad-leafed ornamentals or crops, apply them with low-pressure spray—not more than 30 pounds—when there is little or no wind. For best results, use them be- fore the leaves begin to turn yellow or red. Amino triazole i
. Chemical control of woody plants in California. Woody plants; Herbicides. border. It is not related to true oaks, but to poison ivy, found in other parts of the United States. 2,4-D, 2,4,5-T, Animate, and amino triazole are all used in its control. Brush- killer mixtures of 2,4-D and 2,4,5,-T are more effective than either chemical alone. Since brush killers may injure nearby broad-leafed ornamentals or crops, apply them with low-pressure spray—not more than 30 pounds—when there is little or no wind. For best results, use them be- fore the leaves begin to turn yellow or red. Amino triazole is as effective as the brush-killer mixtures and may be used with greater safety to surrounding vege- tation. Although Ammate is more expensive than brush killers, it can be used when plants are older and is safer to use near ornamentals and crops. Add a wetting agent. Retreatment the following year is usually necessary, and some plants will. Poison oak has been killed by spraying with 2,4-D. continue to sprout for three or four years. Do not burn poison oak. Oils in smoke, especially if inhaled, can often be more harmful than the effects of touching the plant. Cattle, sheep, and goats may browse poison oak, but not enough to control it. Actually, heavy browsing by livestock kills competing woody plants, often in- creasing poison oak stands. Spray the plants completely to the ground line, including the stems. Poison oak is usually old enough to spray in May in the Sierra foothills, and in May through early July at higher elevations and along the coast. The season for spraying may be slightly extended by adding 1 per cent light emulsifiable sum- mer oil to the spray mixture. One gallon of the mixture will treat five medium- sized clumps. Basal sprays will kill poison oak al- most any time of year, but are most ef- fective during spring and early summer. Their use lessens the chances of damage to nearby ornamental or crop plants sen- sitive to 2,4-D and 2,4,5-T. Some retreat-
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