How to Treat Needle Drop on Evergreen Conifers

This is a symptom that can signal anything from a wicked tree trouble to no problem at all .

1. What it looks like

All the needle on a conifer begin to brown up or cast off .

2. How to diagnose it

A key is understanding when phonograph needle shedding is normal and when it ’s not . Of course , we ’re excluding deciduous conifers such as larch ( Larix deciduaand cvs . , Zones 2–6 ) or bald-pated cypress ( Taxodium distichumand cvs . , Zones 4–9 ) that drop all their needle every fall . Most evergreen conifers used in landscapes retain their needles for four to eight age . This mean that they shed interior needles each twelvemonth and we unremarkably never even notice that needles have put down . At the other extreme , if all needles on a coniferous tree begin to brown up or deteriorate , it may be effort for major headache .

3. What causes it

Sudden and widespread phonograph needle dip can be an indication of a antecedent - rot pathogen or other serious tooth root issue . phonograph needle shedding can also be an meter reading of specific needlecast disease , especially on spruce ( Piceaspp . and cvs . , Zones 4–9 , photo ) and Douglas fir ( Pseudotsuga menziesiiand cvs . , Zones 4–6 ) . Needlecast fungi taint current - year ( outermost ) needles , which then give way the following year . As a result , conifers with needlecast often have an proscribed “ shell ” with live needle , while the interior of the tree is unsheathed .

4. How to treat it

Needlecast diseases can be cover with fungicide applications , but you should consult with a certified tree surgeon to determine if treatment is warranted . regrettably , if the issue is root word - related , there often is no fairish treatment .

TIP : DON’T headache IF YOUR ashen pine ARE YELLOW

One of import exception to perceived problematic needlecast is Eastern snowy pine ( Pinus strobusand cvs . , Zones 2–9 ) , which normally expend its needles after two growing season . The senescing needles on white pines often release bright yellowish before they drop . This may be alarming , but it ’s completely normal .

FromFine Gardening#194

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