Tall, slender tree over 40 m tall with a dense crown. The bark on the trunks is thick, dark gray, smooth. The branches are strong, outstretched with rising ends. The needles are large (up to 20 cm long) bluish-green. Cones up to 8-17 cm long, ovoid-elongated in shape with spectacularly curved ends of the seed scales. In one cone - up to 140 nuts.
Pine needs fertile, fresh, but not waterlogged soil. Resistant to city conditions. It begins to bear fruit 15-20 years after planting.
Propagated by seeds. Sowing is carried out in the fall, just before the frosts (so that rodents do not have time to destroy them) and cover with leaves. Spring planting with preliminary seed stratification is more reliable. Seeds are first pickled: dipped for 2 hours in a half-percentage solution of potassium permanganate. Then soaked in hot water (+40+50 °C) for three days. Water is changed daily. After that, the nuts are thoroughly mixed with peat. Then they fall asleep in a wooden box with a layer of 10-20 cm. For air access, holes are made in the side walls and bottom of the box, and blocks are placed under the box. At least once every 15 days, a mixture of sand or peat with seeds is well mixed and moistened. After 3 months, sowing is carried out in the soil to a depth of 2-3 cm.
Eng.: Korean pine. Bot. syn.: Pinus mandschurica Rupr.
* BY LIGHT AND SMELL.
The simplest of light traps - a metal baking sheet or any other shallow vessel of a larger size is hung on a tree. It should be illuminated from above by an electric bulb or flashlight. Water and a little odorless vegetable oil are poured into the baking sheet. A glass jar with a decoction of fruit tree leaves is placed in the middle of the baking sheet, covered with gauze. It spreads a smell familiar to insects. At night, attracted by the light, the pests circle above the baking sheet and fall into it. The oil envelops their wings, and they can no longer fly. Now new insects are attracted not only by the light, but also by the smell emitted by the captive females. The trap begins to work with double force.
There is a case when a female pine sawfly attracted 11 thousand insects in 8 days.