If you are pruning a diseased branch, what should you ensure to do?

When pruning a diseased branch, it is essential to cut into healthy wood, which directly addresses the concern of preventing the spread of disease. Cutting down to healthy wood ensures that all infected tissue is removed, thus minimizing the likelihood of the disease affecting the rest of the plant. This method promotes the health of the plant by allowing for better healing and growth, as well as reducing the chance of pathogens lingering in the area.

Ensuring that the cut is made into healthy wood is a common practice in pruning, as it supports the plant's recovery. It helps to protect the remaining part of the plant and creates a clean wound that can heal properly, which is crucial for overall plant vitality.

The other choices do not support the best practices for pruning diseased material. For instance, cutting above the disease may leave some of the affected tissue, which can lead to continued infection. Leaving a stub can create an entry point for pests and diseases, hindering recovery. Applying fertilizer after pruning does not directly address the immediate issue of disease and can sometimes stress the plant further if it is already compromised.