How effective is pruning spray for trees in promoting healthy growth and preventing disease?

Pruning spray can be effective in promoting healthy growth and preventing disease in trees when used correctly. It helps to remove dead or diseased branches, allowing for better air circulation and sunlight exposure. However, the effectiveness of pruning spray can vary depending on the type of tree and the specific disease being targeted. It is important to follow proper pruning techniques and use the appropriate spray for the best results.