Every landowner who cuts, or any person who cuts or procures another to cut, or any person who owns the timber at the time of cutting and knowingly and willfully allows to be cut, for commercial purposes, timber from ten acres or more of land on which loblolly or white pine, singly or together, occur and constitute twenty-five percent or more of the live trees on each acre or acres, shall reserve and leave uncut and uninjured not less than eight cone-bearing loblolly or white pine trees fourteen inches or larger in diameter on each acre thus cut and upon each acre on which such pine trees occur singly or together, unless there is in effect for such land a planting, cutting or management plan as provided in subsection D of § 10.1-1163. Where eight cone-bearing loblolly or white pine trees fourteen inches or larger in diameter are not present on any particular acre, there shall be left uncut and uninjured for each such pine two cone-bearing pine trees of the largest diameter present less than fourteen inches in diameter. Such pine trees shall be left uncut for the purpose of reseeding the land and shall be healthy, windfirm, and of well-developed crowns, evidencing seed-bearing ability by the presence of cones in the crowns.