THE EFFECT OF TEMPERATURE ON THE SUSCEPTIBILITY OF PLANTS TO 2,4-D

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Abstract
Greenhouse-grown plants of kidney bean, perennial rye grass and crabgrass, sprayed with 2,4-D (0.001 - 0.5%), responded according to the temps. at which they were placed. Both greater growth responses and greater killing occurred at 25[degree] than at 15[degree] or 5[degree]C. Higher concns. were required to induce killing at the lower temps. When sprayed plants were moved from lower to higher temps. increased killing resulted. Holding plants at different temps. (25[degree], 15[degree], 5[degree]C) previous to spraying and then placing at a common temp. (15[degree]C) produced variations in response according to the temp. at which they were previously held.