Illinois Pesticide Applicator Practice Test

When using a tree injection system, what practice should you follow?

1. Inject at high pressure

2. Use low pressure and allow the tree to uptake chemical

3. Inject multiple chemicals at once

4. Only use while the tree is dormant

The correct answer is: Use low pressure and allow the tree to uptake chemical

Using a tree injection system involves introducing chemicals directly into the tree's vascular system, and employing low pressure during this process is critical for several reasons. First, low pressure minimizes the risk of damaging the tree's internal structures, such as the xylem and phloem, which are essential for nutrient and water transport. When injected at low pressures, the tree has the ability to uptake the chemical more effectively, allowing the active ingredient to move throughout the tree and reach the desired target areas. Additionally, allowing the tree to uptake the chemical gradually can lead to better integration and effectiveness of the treatment, reducing the likelihood of toxic shock to the plant. This method also enhances the overall health and recovery of the tree while ensuring that the chemical is properly distributed. In contrast, injecting at high pressure could cause injury or rupture to the tree's vascular tissues, and combining multiple chemicals at once can create adverse reactions that diminish efficacy or even harm the tree. Furthermore, while it's common to consider the state of the tree (like dormancy) when planning treatments, it is not strictly necessary to only use the injection system during that period. The focus should be on ensuring the best delivery method, which is why using low pressure is the recommended practice.