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greenerideal.com/news/environment/0618-why-is-my-pine-tree...

For all the benefits pine trees can offer, they also suffer from their share of problems.. One of the most common and most vexing is when your pine tree starts losing its needles. When this happens, it can spell the death of the tree.

hymotion.com/causes-for-pine-trees-losing-their-needles

For all of the benefits pine trees can offer, they also suffer from their share of problems. One of the most common and vexing is when your pine tree starts losing its needles. When this happens, it can spell the death of the tree. Unlike the leaves on deciduous trees, pine trees never regrow their needles.

www.hunker.com/12245435/how-to-save-pine-trees-with...

The signs of stress or disease in pine trees will often go unnoticed for a time. When a pine tree starts losing needles, it is in serious stress. The stress can have environmental causes or may be the result of disease. In any case, the tree is conserving resources by dropping needles. Photosynthesis may slow, preventing new growth.

forestry.usu.edu/.../tree-care/pine-losing-needles

My Pine Tree is Losing its Needles. by Michael Kuhns, Extension Forestry Specialist. Have many of the needles on your pine tree have been dropping off lately? Don't worry and don't cut the tree down! There is a perfectly natural explanation.

gardening.yardener.com/Problems-Of-Pine-Trees

Pine Trees Have White Powder Or Scale On Needles; Dead Pine Tree Branches Are Falling Off In Wind And Sap Runs Down Tree; Scotch Pines Are Turning Yellow From Center; Spruce Tree Is Dropping Many More Cones Than Normal; Loblolly Pine Tree Is Dropping Green Needles; Red Pine Tree Has Black Insects And Bark Is Falling Off

www.gardenguides.com/98742-save-pine-trees-browning...

Browning, falling needles on pine trees may be a natural occurrence, depending on the species and age of the pine tree. If the inner needles are browning and dropping beginning in autumn, the pine tree may simply be shedding its older needles.

homeguides.sfgate.com/signs-sick-pine-tree-65950.html

An unhealthy pine tree may display a variety of symptoms. Dropping needles and discoloration are prime signs that something is amiss and your pine needs attention.

homeguides.sfgate.com/dead-needles-lower-branches-pine...

As evergreen conifers, pine trees provide year-round color to a garden. They produce new shoots from the tips of branches, while older, inner needles occasionally turn brown and drop.

blog.davey.com/2018/01/what-pine-trees-lose-their-needles-in-winter

Which "Pine" Trees Lose Their Needles in Winter (And Evergreen Trees That Don’t Drop Needles) All trees with needles will eventually shed some needles. As the trees age, older needles on the inside of the tree brown and drop off to make room for new needles.

www.mortonarb.org/.../horticulture-care/seasonal-needle-drop

Every year, evergreens experience a seasonal needle drop that is a normal part of the plant's cycle. Needles of conifers have varying life spans and do not remain attached indefinitely to the tree. Many evergreen needles, as they age, will turn yellow, then brown, and drop off after one to several years.