Bio-pesticide refers to a kind of pesticide preparation that uses biological organisms or their metabolites to control pests, germs, weeds, nematodes, rodents and other harmful organisms, or a pesticide preparation with specific effects through biomimetic synthesis. Regarding the scope of biological pesticides, there is currently no very accurate and uniform definition at home and abroad. According to the standards of the Food and Agriculture Organization of the United Nations, biological pesticides are generally natural compounds or genetic modifiers, mainly including biochemical pesticides (pheromone, hormones, plant regulators, insect growth regulators) and microbial pesticides (fungi, bacteria, insect viruses, Two parts of protozoa, or genetically engineered micro-organisms, agricultural antibiotic preparations are not included. According to its composition and source, bio-pesticide in China can be divided into four parts: microbial live pesticide, microbial metabolite pesticide, plant-derived pesticide and animal-derived pesticide. According to the control object can be divided into insecticides, fungicides, herbicides, acaricides, rodenticides, plant growth regulators and the like. For the purposes of its use, biological pesticides are generally divided into two categories: direct use of biological organisms and utilization of physiologically active substances derived from organisms. The former includes bacteria, fungi, nematodes, viruses and antagonistic microorganisms, and the latter includes agricultural antibiotics and plants. Growth regulators, sex pheromones, feeding inhibitors, juvenile hormones, and physiologically active substances derived from plants. However, in the practical application of agricultural production in China, biological pesticides generally refer to microbial pesticides that can be used for large-scale industrial production. Wood is divided into two distinct kinds called hardwood and softwood, though confusingly the names don't always refer to its actual hardness or softness: KelaiWood , https://www.kelaiwooden.com
Hardwoods typically come from broad-leaved (deciduous) trees (those that drop their leaves each fall, also known as angiosperms because their seeds are encased in fruits or pods). Examples include ash, beech, birch, mahogany, maple, oak, teak, and walnut.
Softwoods typically come from evergreen (coniferous) trees (those that have needles and cones and retain them year-round, also called gymnosperms. Examples include cedar, cypress, fir, pine, spruce, and redwood.