Herbicide Mixtures
A 75 to 100% rootkill of mesquite can be achieved by spraying with a mixture of triclopyr (Remedy™) and clopyralid (Reclaim™).
For best results, always follow label directions.
Don't spray when rains have stimulated light green, new growth in tree tops or when foliage shows damage due to hail, insects, or disease. Spray foliage to wet but not dripping. Do not spray in the vicinity of desirable trees, shrubs, or crops.
The cost of treatment varies according to the density and size of mesquite infestations. Periodic follow-up treatments will be necessary to maintain low mesquite populations.
Stem Sprays
Stem sprays on individual mesquite work best on relatively young mesquite trees that have smooth bark and few basal stems. Only stems less than 4 inches in diameter should be sprayed. Spraying may be done anytime during the year, although best results occur during the spring-summer growing season
http://msdssearch.dow.com/PublishedLite ... age=GetDoc
Soil moisture and growing conditions
may seem dry to you, but not to a mesquite.
Mesquite can be healthy and growing —
and ready to spray — even if the soil is dry.
Rainfall can actually be bad for mesquite
control. Rains during a dry period can cause
new leaf growth on twig tips, indicating
upward translocation. Don't spray then.
T
oo much dry weather also can be bad
if it affects mesquite foliage. Don't spray
if the foliage is obviously drought-stressed
— very sparse foliage on the mesquite,
leaves turning yellow, leaf margins and
tips necrotic, or leaves dropping. But don't
worry about grasses being dry or "droughtdormant"
if the mesquite foliage is healthy