The drop of pine needlescan be both a natural process and associated with an attack of a pine disease or pest. But how do you recognize natural shedding of needles from infection?How to prevent pine needles from dropping ? We will try to answer these questions. Seewhy pine loses needlesand what to do then!
Browning and falling pine needles
Autumn pine needle drop
In late summer and autumnpine needles on older shoots turn yellow, turn brown and eventually fall off . These symptoms worsen when summer is dry. To reduce this phenomenon, pine should be watered abundantly during drought.
Pine loses needles due to improper growing conditions
Pines are light-loving trees with modest soil requirements, usually very resistant to drought. Pine trees even succeed in dry and sandy soil, they are resistant to frost. They will do best in slightly acidic to alkaline soil. However, they do not tolerate heavy and wet soils. Then,discoloration and dropping of pine needles may appear
"Alsoover-fertilization may be the reason why pine loses needles . Pine trees like substrates that are not very rich in nutrients. In the case of pine, the principle that less is better works. "
Dropping pine needles caused by diseases
Unfortunately, some pines, mainly of foreign origin, are attacked by dangerousfungal diseases that cause pine needles to drop .
5-needle pines, mainly white pine, are attacked bywhite currant rust , while three-needle and some two-needle pines attackpine shoot dieback fungus .
Another disease that causes pine loses its needles is phytophthora.Pine needles become chlorotic, turn yellow, turn brown and, consequently, fall off.After digging the pine from the ground, you can see the rot and root rot characteristic of phytophthora. Infested plants die fairly quickly. It should be remembered that sandy ground and low humidity limit the development of the pathogen. No more plants should be planted where an infected plant has grown. It is worth using the Magnicur Energy 840 SL preparation, which can be used to disinfect the substrate and make a prophylactic spray. You can also fight phytophthora with the use of the biological agent Polyversum WP.
Anotherdisease that causes pine needle dropping is armillary root rot.Pine needles are chlorotic and devoid of gloss. When attacked by rot, they turn yellow and consequently fall off. Pine bark turns brown, dies, and cracks lengthwise, revealing wood.Abundant white mycelium covering the entire circumference of the stem is visible on the surface. Remove the diseased plants, and do not plant any new plants in the place where they grew, and spray the plants growing next to them with Rovral AquaFlo 500 SC.
Dropping of pine needles also causes pine rashYellow needles are visible throughout the growing season, in spring and summer spots appear on the needles, and in September, characteristic transverse lines appear. Over time, the spots turn black and the needles die off. In April of the following year, the needles deform, turn brown and fall off. Spores that form on fallen needles infect pine trees from September to November. Therefore, it is very important to remove fallen needles from under the pines. Fighting with pine rash, it is worth trying alternately Topsin M 500 SC and Amistar 250 SC.
Pine loses needles because it is attacked by a pest
The pine needle is a pest that causes pine needles to drop.The larvae of this aphid winter on the tops of the shoots at the base of the needles.At the turn of April and May, they transform into females that lay eggs on new shoots. The larvae hatch from the eggs and feed on the shoots, and consequently the needles turn brown and fall off. In the fight against the bastard, it is very important to spray the plants with the Promanal 60 EC or Emulpar 940 EC oil preparation in the spring. If an insect is noticed, in summer, spray it with an aphicidal preparation, e.g. Decis Ogród 015 EW.
Anotherpest causing pine needle drop is the pine weevil , which mainly attacks mountain pine. The larvae and females of this scale feed in large groups on the inside of the needles, resembling a white coating on conifers. As a result of feeding this pestpine needles turn yellow and fall offIn June, females lay eggs, from which larvae emerge after 3 weeks. Therefore, in July, after noticing symptoms, spray Mospilan 20 SP twice every 14 days.We guarantee high quality products, low price and fast shipping. To see the available
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MSc Eng. Joanna Białowąs
