Which tree species should not be mixed?
Creating mixed forests with more than two tree species can improve land conditions, improve protection, and enhance the ability to resist fire, pests and diseases. However, not all mixed tree species are beneficial. Unfavorable mixed plant types not only inhibit each other's growth, but also cause serious pests and diseases. For example: 1. Poplar and larch mixed planting: such as poplar, poplar, Beijing poplar, poplar, poplar and other poplar yellow rust (or yellow powder disease) is the main host of larch, the first time in the year, then The infestation of pine leaves caused early defoliation, shoot tipping, late leafing, and small leaves, which seriously impeded the growth of volume. Second, Populus tomentosa and Sangkeshu mixed planting: Populus tomentosa and mulberry, structure, alfalfa tree and other mixed species of Mulberry, Populus tomentosa is seriously harmed by Mulberry. This is because adults of Sang Tianniu need to feed on the nutritional supplements of the mulberry trees to produce larvae, and then harm P. tomentosa. Without M. sinensis, Sangtianni can't lay eggs and can not complete the life cycle. Third, cloud shed and larch mixed planting: prone to larch ball maggots, locusts first in the spruce on the continuous sexual reproduction, not only to cause serious damage to the deciduous, and the larvae stimulated by the locust tissue susceptible to cancerous fungi spore. Fourth, mixed spruce and heavy cherry planting: prone to spruce cone rust disease, diseased cones early dry, so that the seed yield and quality decreased, seriously affecting the spruce natural regeneration and seed collection work. 5. Mixed Pinus tabulaeformis and Huang Boluo: These two tree species are mixed and planted, and pine needle rust is prone to occur, the infection is serious, and the windward surface is heavier than the lee surface. 6. Mixing apples with pears: Apples and pears are mixed and planted with a total of rust. However, pears with viruses do not show symptoms. Apple suffers from a decrease in yield, a decline in quality, inability to eat, and even deforestation. .