| Sumario: | 2,4-D was sprayed for weed control in one-and-two-month-old sugar cane. Weekly growth measurements following the applications showed that one pound per acre did not affect the growth of one-month-old plants. Rates up to four pounds were safe for plants two months old. Applications of two and four pounds per acre of the isopropyl ester over the tops of one-month-old plants caused a marked reduction in growth. The same rates were relatively safe, however, when applications were made at the base of the plants, so that the tops were not actually covered by the spray. A triethanolamine salt formulation caused a reduction in growth of one-month-old plants when the sprays were applied over the tops at two and four pounds per acre.
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