Ponderosa and Scots pines are severely damaged by this disease in Minnesota. Pines shed older needles similarly to other trees’ fall foliage drop. The disease can eventually kill young trees … Both of those issues can cause your arborvitae to turn brown. Declining trees tend to be in sites with several or all of the following characteristics: High soil pH. Drought weighs heavily on trees like the arborvitae, and watering during this season is essential. Red, mugo, and Scotch pines are also susceptible. Several factors related to growing conditions are involved in white pine decline. Symptoms: Between March and April, the needles on the lower part of the tree begin to turn brown. But there are easier, less radical solutions to other problems. In the summertime, your tree is likely combating intense heat from the sun, as well as dry soil. Check out this list to identify your pine tree’s symptoms and find suggested treatments. It you see dead needles on pine trees, take the time to figure out the cause. Needles over … The most common cause of brown pine needles occurs in the fall and is normal. Drought. … Start by noting the season and which part of the tree is affected. Tree browning and death follow. Pine Trees Affected: This disease causes the most damage to Austrian pine and Ponderosa pine. Drought-like conditions are another cause of arborvitae turning brown. Look for sunken infection sites on the tree trunk. If you find dead needles on lower pine branches only, you are probably not looking at normal needle shed. Brown spot needle blight causes needle spots, browning and needle loss on pine trees. Infected trees have slow growth and often have bare lower branches. Pine trees are evergreen, so you don’t expect to see dead, brown needles. Note yellowing needles that brown and fall and follow down their branches to look for lesions. 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