Root-knot nematodes is a highly specialized omnivorous plant parasitic nematode, the world's most widely distributed, most harmful plant parasitic nematodes, at present, more than 2,000 species in the world, including almost all cultivated crops, are very sensitive to root-knot nematodes, so they need to be paid great attention.
When we see that the planted crops are not found in the root-knot nematode does not mean that it does not exist, but it has not grown, has not yet posed a threat to the crop, its growth and threat is related to the growth of the crop, if the crop is strong, it can reduce the damage, and if the growth is thin, in the nutrients absorbed by the plant is ingested in large quantities, it will grow the nematode flora, causing high damage. Therefore, root knot nematodes to prevention-oriented, or can start to control when preparing the land, can also be operated according to the actual situation of the plot, heavy stubble is more heavy control, new land can reduce the amount of use, reduce costs, if you use an instrument to detect the existence of root knot nematodes, then there is no piece of land that does not have, to choose rationally.
There are several ways to judge the harm of root-knot nematodes, first, the yellowing of new leaves of fruit and vegetable crops, which is similar to iron deficiency, yellow and white leaf type; Second, the plant is short and thin, and no matter what fertilizer is used, it has not seen much effect; Third, the most direct and final choice is to pull out and see if the root system has root knot nematodes.
The most common agents for the control of root-knot nematodes are avermectin and thiazolphosphonin, which can directly act on nematodes and have a strong systemic conductivity and contact effect; The growth phase of root-knot nematodes is divided into egg, larval and adult stages, and avermectin can act on the larval and adult stages of root-knot nematodes, with gastric toxicity and fumigation, so avermectin plus thiazolephosphine can just achieve a complete control effect.
In recent years, the more popular thiazolphosphine plus amino-oligosaccharide, where is the merit of this formula, and what is its mechanism of action?
Through experimental results and theoretical analysis, the use of avermectin plus amino-oligosaccharin to control root-knot nematodes is a set of formulas with different efficacy from conventional. Amino-oligosaccharide is mainly to regulate plant growth and development and induce activation of plant immune system, improve plant stress resistance, aminooligosaccharide is extracted from chitosaccharide, and chitosan is extracted from chitin, so amino-oligosaccharide is the third generation of extracted disaccharides, for small molecule substances, can enter the cell under a certain osmotic pressure, do not need the adsorption of charged particles, so aminooligosaccharide can also be understood as a carrier, When thiazolphosphine is added to amino-oligosaccharide or fertilizer is added with amino-oligosaccharide, it can have a very good rapid absorption effect, which can reduce the amount of the main agent.
Therefore, the addition of amino-oligosaccharin to thiazolphosphine can reduce the amount of thiazolphosphine, and at the same time can promote root growth, repair the trauma caused by root knot nematodes, regulate the absorption of nutrients by crops, restore crop growth, and to a certain extent, reduce the damage caused by thiazolphosphine itself to crop roots, and it is relatively safe to use at the seedling stage.