Diplodia tip blight is a fungal disease that primarily affects pine trees, particularly Scots pine and Eastern white pine. It is caused by the fungus Diplodia pinea, which infects the new growth, leading to wilting, browning, and eventual death of the tips of the branches. This can result in stunted growth and a decline in the overall health of the tree. The disease is most prevalent in warm, wet conditions and can spread through wind, rain, or contaminated tools. Management strategies include proper pruning, improving air circulation, and applying fungicides when necessary to protect healthy trees from infection.