The Austrian pine ( Pinus nigra ) is a unfearing , dispirited - maintenance evergreen tree diagram that ’s often constitute as windbreaks and borderline course . The Austrian pine tree has dark fleeceable , dense foliage with 2- to 4 - inch long needles that grow in grouping of two . The tree can reach up to 60 feet marvelous and 40 feet encompassing , normally maturing into a natural pyramidal frame . Originating from Austria , Yugoslavia and northerly Italy , the Austrian pine tree grows unspoiled in USDA hardiness zones 4 through 7 , where wintertime are cold and temperatures can dip down to minus 25 degrees Fahrenheit .
Step 1
irrigate your Austrian pine trees deep to soak the grunge down to the roots only during times of drought or prolonged dry spells . Regular or supplemental watering is not necessary .
Step 2
Prune your Austrian true pine trees in former wintertime or early spring to remove all dead , pathologic or damaged limbs .
Step 3
Treat your Austrian pine tree diagram for the common fungous disease Diplodia tip blight by trim away the diseased or canker branch . Spray the pine tree diagram with a fungicide consort to the directions on the recording label .
Step 4
Control pine tree needle ordered series infestations by spray your Austrian pine trees with an appropriate insecticide when the scale of measurement worm are peregrine and in the " crawler " microscope stage , which is usually in June or July . Spray your pine with a dormant horticultural oil in late winter to kill the over - overwinter scale of measurement insects .
Step 5
watch over out for barque mallet infest your Austrian pine Sir Herbert Beerbohm Tree . Look for hole bored into the pine tree diagram ' trunks to detect bark beetles . Get rid of the bark beetles using an appropriate insect powder , fit in to the didactics on the label .
Tip
Dothistroma acerate leaf blight is another fungal disease that attacks Austrian pine tree trees , cause the needles to brown and develop cerise - brown billet or isthmus . Spray the Austrian pines with a Bordeaux mixed bag or another fuzz - based fungicide in mid - May and again in mid - to - tardy June .
Warning
Avoid fertilizing your Austrian pine Tree , because doing so can cause gigantism . you’re able to , however , spread a 2- to 3 - inch layer of bark mulch around the substructure of the pine trees to help manipulate weed and keep on ground moisture . Wear gloves and center protection when you ’re spraying your Austrian pine trees with insecticides , fungicides or other chemical substance .
