![]() Use of Triclopyr is best done in the dormant season to lessen damage to non-target plants. Tis method should only be used in less sensitive areas because runoff of diesel fuel and herbicide may harm nearby plants. Spray to a height of 12 to 15 inches (30.5 to 38.1 cm). ![]() This mixture is sprayed, using a hand sprayer, to the basal portion of the tree trunk. Two or 2 1/2 ounces of Garlon 4 is added to 1 gallon of diesel fuel. Cut-surface application can be made during any season of the year, but application during the dormant season reduces the potential for injury to other plants due to drift.īasal bark treatment with Garlon 4 also is effective. Application should be as soon as possible, and no later than two to three hours after cutting. Girdles can be made rapidly using a chain saw. Either a stump or girdle can be used for the cut surface. A diluted solution of Garlon 3A (50-percent solution in water) can be sprayed on cut surfaces or else wiped on the cut surface using a sponge applicator. This method should not be used in high-quality natural areas because vegetation around the tree may be killed.Ĭut-surface treatment with Garlon 3A, a selective translocated herbicide, effectively controls Osage orange. A narrow band of Garlon 4 encircling the stem is needed for control. This only works on trees with stems less than 6 inches in diameter. Undiluted Garlon 4 can be applied in a thin stream to all sides of the stem, 6 inches above the base of the plant. Triclopyr herbicide (trade name Garlon 4 or 3A) is effective as a bark treatment or cut-surface treatment. Same as given above for heavily infested areas in natural communities except that labor-saving herbicides discussed below may be used when manpower is limited. A cut-surface treatment with herbicide, as described below, is recommended to minimize sprouting. Workers should take extra precautions to protect their eyes, hands, arms, knees, and feet when handling these sprouts. The tips of these spines are brittle and may remain embedded when the spines are extracted from puncture wounds. Large Osage orange trees are resistant to fire and will need another control method such as girdling or cutting.Īll cutting or girdling practices, without herbicide treatment, will result initially in the development of masses of vigorous sprouts which are extremely difficult and hazardous to handle due to their axillary spines. Burning in conjunction with cutting works well on small plants. Periodic prescribed burning will help keep young Osage orange plants from becoming established. The bark is knocked off using a blunt object like the head of an ax. Two parallel cuts 3 to 4 inches apart, cutting through the bark slightly deeper than the cambium, are needed. Girdling can be done with an ax, saw, or chainsaw. The girdles should be checked every several weeks at first to make sure that bark does not develop over the cut area. ![]() The xylem should be left to continue to conduct root reserves into the crown, thereby diminishing the capacity of the tree to resprout. Older trees have quite thick bark, making girdling difficult.įor girdling, the phloem should be removed without damaging the xylem. GirdlingĪlthough girdling has not been tried as yet on Osage orange, it may prove successful on smaller trees that do not have thick bark. Cutting is most feasible with smaller plants. Repeated cutting may be necessary to control Osage orange completely because it resprouts from the stump and by root suckers, and may cover large areas vegetatively. Summer cutting affects the plant when its root reserves are low and the possibility of adverse weather during the fall and winter may further harm the plants. CuttingĬutting during summer months (June–August) should provide the best results, and two cuttings in one year are more effective than one. Initial Efforts in Areas of Heavy InfestationĬutting and/or burning offer the best solutions for control.
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