Eliminate mimosa trees

Mai Duong grows fast, thrives, strong births can quickly form carpets, large shrubs and forests, overwhelming other species that cannot grow.

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The Department of Biology, University of Natural Sciences (VNU-HCM) has successfully studied the method of spraying salt solution to defoliate apricot trees to supplement the synthesis process of eliminating dangerous alien plants. .

Mimosa also has a number of other names such as wood charcoal virgin, virgin marsh, pointed virgin, cat eye, brown virgin, shaded American . with the scientific name Mimosa pigra of Mimosaceae family, originating from Central America, was imported into the South of Vietnam from Indonesia in the 70s of the last century.

Mai Duong has spread in many ecological regions across the country. This type of shrub is a multi-year shrub that often grows in open, humid, riverside areas. Trees reach up to 6 m tall, divide many branches, coal and branches with many sharp spines.

From seed germination to flowering, fruiting, seeding and ripe fruit take about 8-10 months. Fruit in the form of beans, brown, containing from 14 to 26 seeds.

On average, each tree produces about 10,000 seeds / year. Seeds have a high vigor, easy to germinate when meeting soil with moisture, spreading widely by many ways such as wind, water, insects, birds and animals.

According to Tram Chim National Park (Dong Thap), in the period 1980 - 1990, the forest area in Tram Chim was only about 10 hectares of invasive mimosa, now it has reached more than 2,000 hectares (25% of the forest area), of which Several hundred hectares of trees grow dense.

Preliminary statistics show that only the area of ​​land in the Mekong Delta provinces is encroached by mimosa trees up to 6,000 hectares, while the Southeast, Central Highlands and Northern provinces are over 10,000 hectares.

Mai Duong grows fast, thrives, strong births can quickly form carpets, large shrubs and forests, overwhelm other species that cannot grow, threaten to make desert and poor soil. working, greatly affecting the ecological environment and other plant and animal species.

This is a very dangerous wild plant, in addition to the harmful level, causing great economic and resource damage, the cost to remove it is not small either.

Only in Tram Chim National Park, each year, the unit has to spend over 350 million VND to hire people to cut and burn but still cannot completely destroy, until the rainy season the trees continue to sprout new and continue to spread spread faster and wider.

According to the process of preventing and combating Mimosa pigra L. woody virgin plants in Vietnam, there are 3 basic measures to kill mimosa trees are manual, chemical and biological applied to national parks and heart areas. water reservoirs or riverside areas and cultivated areas.

According to the Institute of Plant Protection, biological measures have been carried out in some countries including Australia, Thailand . such as dropping granular beetles, stem borer, tree tops but not yet implemented in our country.

Manual measures include removing young trees, cutting down trees, digging mature roots to dry and burning. Chemical measures are combined with the release of mature trees for sprouting and spraying chemical drugs such as Roundup 480SC, Ally 20DF, Glyphosate, Truyclopyr, Paraquat, Metsulfuronmethyl and 2,4D combined with water immersion to destroy young trees.

However, according to scientists, the most effective solution is to destroy them from an early age by removing the seedlings. Localities need to organize a professional team to widely disseminate information about the harm and how to eradicate this dangerous tree.

New measures that Department of Biology, Ho Chi Minh City University of Natural Sciences recommend to add to the process of preventing and synthesizing mimosa trees is spraying NaCl saline solution with concentration of 10-60 gr / l and spraying Mature plants will cause loss of chlorophyll and carotenoids, leading to the loss of greenish greenish greenish brownish brownish brownish brownish carapaceous chlorophyll.

Under the impact of the sun, only after 2 hours spraying salt solution, mimosa trees hurt leaves, branches, 2 weeks later will shed all leaves, favorable for the next manual measures are tight, remove roots to burn.

According to the evaluation of scientists, this is a method that gives much higher economic efficiency than chemical spraying methods because the cost is much cheaper, feasible and widely applicable. .