Normally, an aerial applied spray treatment by helicopter is used to remove unwanted vegetation and to assist in the control of further unwanted vegetation during the next growing season after the new crop of trees has been planted.
Application of herbicides can also be done with a 4-wheeler on smaller tracts where a helicopter would be too expensive, or by hand crews, or by a skidder or tractor with spray booms. To insure correct herbicide brand and rates, all equipment must be calibrated!!!
Typically, this is done during late summer or very early autumn when the vegetation is still green and "breathing". This also gives the vegetation time to brown up which will assist with a site prep burn in late autumn, early winter.
Several to many types of herbicides may be used. Some are listed here. But it is important to see the site to be sprayed and assess it during the summer months to determine the most efficacious prescription mixture. Normally, we need to have the prescription and spray plan done by July 15th. Chesnut Forestry can visit the site, make some general assessments, map the area to spray and handle all the details.
Site Prep Spraying
Like with Site Prep Spraying, this can be done aerially by helicopter for larger tracts (greater than 15 acres or so). But for smaller tracts, and relatively clean tracts, post-planting spray can be done by tractor, 4-wheeler, or even backpack.
Most of the spraying Chesnut Forestry has done has been band spraying and spot spraying over and around freshly planted pine trees, in order to remove weed and herbaceous competition for the critical first few months of the new pines' existence. This requires careful planning, precise chemical mixtures and slow application.
This type of herbicide application includes spraying kudzu, privet, or other unwanted "patches" of vegetation, be it as an individual operation or part of site prep or post-planting.
Large patches can be aerially treated. But most commonly, access and protection of desired species makes such application impractical.
Chesnut Forestry has the equipment necessary to carry out smaller "patch" jobs, but sometimes, as is the case with kudzu, a crew must be contracted.