. Chemical control of woody plants in California. Woody plants; Herbicides. The Sierra gooseberry—very impor- tant in the Sierra of California—is readily killed, generally with low dosages of an aqueous spray of 2,4-D (% pound per 100 gallons of water), especially in June. As the season progresses, it be- comes increasingly hard to kill. Also, bushes in association with heavy stands of mixed species of brush are hard to kill by foliage sprays at all seasons. Basal sprays on ribes are especially useful where poor results from foliage sprays are probable. In general, the esters of 2,4,5-T are pr
. Chemical control of woody plants in California. Woody plants; Herbicides. The Sierra gooseberry—very impor- tant in the Sierra of California—is readily killed, generally with low dosages of an aqueous spray of 2,4-D (% pound per 100 gallons of water), especially in June. As the season progresses, it be- comes increasingly hard to kill. Also, bushes in association with heavy stands of mixed species of brush are hard to kill by foliage sprays at all seasons. Basal sprays on ribes are especially useful where poor results from foliage sprays are probable. In general, the esters of 2,4,5-T are preferable to the esters of 2,4-D, with very thorough wet- ting of the lower part of the stems and root crown essential. Mixtures of these two chemicals are satisfactory, and on some species 2,4-D esters are permissible. Stump or decapitation methods were formerly used more than now. Control can be had with oil alone, or using a basal-spray mixture and thoroughly wet- ting the cut stumps and crowns. Mountain misery, or bear clover. Woody plants are often so abundant in California forest lands that they interfere with the survival of hand-planted trees. Mountain misery, one of the commonest, can be controlled using 2,4-D or a brush- killer mixture applied from March through early June (see Table A, page 30). Manzanita. Competition with sprout- ing manzanita may also lead to a very low degree of survival of planted pine seedlings. Chemical control in pine plan- tations would be warranted. Scotch broom. This is a serious pest in several Sierra Nevada counties. It invades pastures, grows in dense cover along roads, infests yellow pine forests enough to hinder pine reproduction, and creates a serious fire hazard. French broom and common broom are also pres- ent in some areas. All are readily controlled with basal brush-killer sprays in Diesel oil. For foli- age spray of Scotch broom use 2,4-D esters in water containing % per cent summer oil (2 pounds of 2,4-D in % per cent summer
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