. Using phenoxy herbicides effectively : 2,4-D, 2,4,5-T, MCPA, Silvex, 4-(2,4-DB). Herbicides; Plants Effect of herbicides on. emulsions when mixed with water. Heat causes ester formulations to release vapors. At temperatures below 90° F., low-volatile esters are much less volatile than high- volatile esters, and arc less likely to damage susceptible crops. Vapors from either low- or high-volatile esters are about equally phytotoxic at temperatures above 90° F. Vapors from ester fonnulatioiis ca/i. kill susceptible plants growing near the area to which the formulations are applied. I^ow-volati
. Using phenoxy herbicides effectively : 2,4-D, 2,4,5-T, MCPA, Silvex, 4-(2,4-DB). Herbicides; Plants Effect of herbicides on. emulsions when mixed with water. Heat causes ester formulations to release vapors. At temperatures below 90° F., low-volatile esters are much less volatile than high- volatile esters, and arc less likely to damage susceptible crops. Vapors from either low- or high-volatile esters are about equally phytotoxic at temperatures above 90° F. Vapors from ester fonnulatioiis ca/i. kill susceptible plants growing near the area to which the formulations are applied. I^ow-volatile esters are safer—that is, less likely to harm susceptible crops by toxic vapors— than high-volatile esters. Salt for- mulations are safest—they do not release enough vapors to cause damage. High-volatile esters are less ex- pensive than low-volatile esters and they can be used effectively and safely if no susceptible crops are growing nearby. Ester formulations of the phenoxy herbicides are generally more potent, pound for pound, than salts. They penetrate leaves and other plant surfaces more readily than salts. Wlien a range of rates is reconnnended for herbicide ap- plication, use the lower rate for esters and the higher rate for salts. Esters are more effective than salts for killing weeds that are growing slowly because of drought or cold weather. Esters usually are best for treating weeds in areas of low lunnidity; esters are formu- lated in oils and remain in moist contact on foliage longer and pene- trate better than salts, which are mixed with water. And, because. BN-13721-X Weeds in this field of small grain (treated part at right) were controlled with 2,4-1). The herbicide costs abont 25 c(>nts per acr(\ 4. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klingman, Dayton L. , 1913-; S
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