Which method is preferred for managing trees at risk from borers?

The preferred method for managing trees at risk from borers is the use of systemic insecticides. Systemic insecticides are absorbed by the tree and can effectively target pests such as borers that may be feeding on the tree’s tissues. This method is advantageous because it allows for direct protection against the pests while minimizing harm to beneficial organisms and the surrounding environment.

In contrast, cutting down the trees would remove the host but does not address the risk to surrounding trees, which can still be affected. Increasing irrigation can benefit tree health but does not specifically target borers, as it may not influence their presence or feeding behavior directly. Applying mulch, while beneficial for moisture retention and root health, does not have a direct impact on controlling borers that are already infesting the tree.

Overall, while other options may contribute to tree health, systemic insecticides offer a targeted and effective approach for managing infestations specifically caused by borers.