Solidago canadensis prevention and control method based on gradient pesticide application

Abstract

The invention belongs to the technical field of biological control, and particularly relates to a solidago canadensis control method based on gradient pesticide application, which comprises the following steps of: dividing solidago canadensis into three stages, namely a seedling stage, a growth stage and a flower bud differentiation stage according to plant height; biological enzyme herbicides with corresponding concentrations are prepared and applied according to different grades of solidago canadensis, and the biological enzyme herbicides comprise solidago canadensis biological fermentation liquor. According to the method, the solidago canadensis is graded according to the sensitivity difference of the solidago canadensis in different growth stages to the pesticide, and then gradient pesticide application is carried out, so that the use efficiency of the pesticide is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of biological control, and particularly relates to a method for controlling Canada goldenrod based on gradient pesticide application. Background Art

[0002] Canada goldenrod (Solidago canadensis L.), native to North America, is a perennial herbaceous plant in the Asteraceae family. Due to its high ornamental value and strong adaptability, it was introduced to China in the 1930s as a garden ornamental plant. However, due to its strong reproductive capacity and ecological destructiveness, it has gradually evolved into a virulent invasive species, posing a serious threat to China's native ecosystems, agricultural production, and biodiversity.

[0003] For many years, the control of Canada goldenrod in my country has mainly adopted manual control and chemical / biological control. Manual control is generally carried out from late August to mid-September each year, but due to the strong vitality of the underground stems, it is difficult to achieve a complete eradication effect with manual physical control alone. Chemical control uses herbicides such as glyphosate, glufosinate ammonium, and sulfosulfuron-methyl, which can achieve a good control effect on Canada goldenrod, but chemical agents are prone to soil residues and drug resistance, and have poor environmental safety. Traditional biological control, such as reed substitution, has low control efficiency and long cycles. So far, biological control technology is still immature, highly dependent on the environment, and has a limited scope of application.

[0004] Currently, chemical / biological control methods generally use uniform dosages without considering the differences in plant growth stages, resulting in inefficiency or waste of resources. Summary of the Invention

[0005] In response to the problems of low pesticide utilization and resource waste in existing Canada thistle control technologies, the present invention provides a Canada thistle control method based on gradient pesticide application. According to the different sensitivities of Canada thistle to pesticides at different growth stages, Canada thistle is graded and then gradient pesticide application is implemented, thereby improving the efficiency of pesticide use.

[0006] The specific technical solutions are as follows:

[0007] A method for controlling Canada goldenrod based on gradient application of pesticides comprises the following steps: firstly, dividing Canada goldenrod into three stages according to plant height, namely, seedling stage, growth stage, and flower bud differentiation stage; and preparing and applying a bio-enzyme herbicide of corresponding concentration according to the different stages of Canada goldenrod, wherein the bio-enzyme herbicide comprises a Canada goldenrod bio-fermentation liquid.

[0008] Furthermore, the plant height during the seedling stage is 0 to 30 cm; the plant height during the growth stage is 30 to 100 cm; and the plant height during the flower bud differentiation stage is greater than 100 cm.

[0009] Furthermore, the concentration of the bio-enzyme herbicide used in the seedling stage is 1-1.5%, and the application amount is 50-60 L / mu; the concentration of the bio-enzyme herbicide used in the growth period is 2-2.5%, and the application amount is 70-80 L / mu; the concentration of the bio-enzyme herbicide used in the seedling stage is 3-3.5%, and the application amount is 90-100 L / mu.

[0010] Furthermore, the bio-enzyme herbicide comprises the following components by weight: 94-97% bio-fermentation liquid, 0.75-1% Tween 80, 1.5-2% paraffin oil, 0.1-0.2% xanthan gum and 1-2% azone, and the bio-fermentation liquid is prepared by fermenting Canada goldenrod.

[0011] Furthermore, the application is carried out by manual spraying, the spraying device is a pressure sprayer, and the droplet particle size of the sprayer nozzle is 150 to 250 μm.

[0012] The beneficial effects of the present invention are:

[0013] The present invention is based on the differences in tolerance of Canada goldenrod to bio-enzyme herbicides at different growth stages. Canada goldenrod is accurately graded according to plant height, and then bio-enzyme herbicides are applied in a gradient manner. This can effectively control Canada goldenrod while reducing the amount of bio-enzymes used, thereby achieving the effect of precise prevention and control and reducing the cost of prevention. DETAILED DESCRIPTION

[0014] The specific embodiments of the present invention will be described in detail below. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated, and they can be combined with each other to achieve better technical effects.

[0015] The present invention provides a method for controlling Canada goldenrod based on gradient pesticide application, comprising the following steps: first, dividing Canada goldenrod into three stages according to plant height: seedling stage, growth stage, and flower bud differentiation stage. The seedling stage has a plant height of 0 to 30 cm, tender green leaves, and an incompletely expanded root system; the growth stage has a plant height of 30 to 100 cm, with lignified stems and rapid nutrient accumulation; and the flower bud differentiation stage has a plant height greater than 100 cm, entering the flowering and fruiting stage. The present invention divides the Canada goldenrod growth cycle into three stages, fully considering the growth and reproduction properties of Canada goldenrod. Applying pesticides during these three stages can maximize the control effect.

[0016] Then, a bio-enzyme herbicide of corresponding concentration is prepared and applied according to different grades of Canada goldenrod. The bio-enzyme herbicide includes a fermentation broth of Canada goldenrod. The bio-enzyme herbicide used in this embodiment includes the following components by weight: 94-97% fermentation broth, 0.75-1% Tween 80, 1.5-2% paraffin oil, 0.1-0.2% xanthan gum, and 1-2% azone, wherein the fermentation broth is prepared by fermentation of Canada goldenrod. The specific preparation method can refer to the preparation method in the Chinese patent application number 2025103866625.

[0017] The concentration of the bio-enzyme herbicide used in the seedling stage of the present invention is 1-1.5%, and the application amount is 50-60 L / mu. The concentration of the bio-enzyme herbicide used in the growth period is 2-2.5%, and the application amount is 70-80 L / mu. The concentration of the bio-enzyme herbicide used in the seedling stage is 3-3.5%, and the application amount is 90-100 L / mu.

[0018] The present invention employs manual spraying, specifically using a backpack pressure sprayer equipped with a fan-shaped nozzle and a droplet size of 150 to 250 μm, to ensure uniform coverage of the entire plant. Spraying is performed in the early morning or evening on rainless days, avoiding periods of high temperatures. For plants in the flower bud differentiation stage, spraying is focused on the flower buds and stem base to inhibit flowering and regeneration.

[0019] Example

[0020] This example employed the aforementioned gradient-based herbicide application method to control Canada goldenrod. Specifically, a 1.5% concentration of bio-enzyme herbicide was applied at a rate of 60 L / mu (approximately 1.5 m) to a seedling at its 23.9 cm tall stage. Manual spraying was used, and mortality among the different treatments was recorded 14 days after application.

[0021] Canada goldenrod plant height at full growth was 57.1 cm. A 2.5% concentration of bio-enzyme herbicide was applied at a rate of 80 L / mu. Manual spraying was used, and the death rate of Canada goldenrod plants under different treatments was counted 14 days after application.

[0022] At the flower bud differentiation stage, the plant height of Canada goldenrod was 101.4 cm. A 3.5% concentration of bio-enzyme herbicide was applied at a rate of 90 L / mu. Manual spraying was used, and the fruit set rate of Canada goldenrod was calculated 14 days after application among the different treatments.

[0023] Comparative Example

[0024] This comparative example differs from the example in that a 3% concentration of bio-enzyme herbicide was applied to the Canada goldenrod throughout its growth cycle, at a rate of 90 L / mu. Other steps and parameters were consistent with the example. The comparative experimental results are shown in Tables 1-3 below.

[0025] Table 1 Comparison of data between examples and comparative examples at seedling stage

[0026]

[0027] Table 2 Comparison of data between examples and comparative examples during growth period

[0028]

[0029] Table 3 Flower bud differentiation period embodiment and comparative example data comparison table

[0030]

[0031] Analysis of experimental results: As shown in Table 1, both bio-enzyme herbicide application techniques have a significant control effect on Canada goldenrod seedlings (P<0.05). Fourteen days after application, the Canada goldenrod seedlings were essentially dried up and dead. The traditional application method had a mortality rate of 96.35% for Canada goldenrod, while the gradient dose application technique had a mortality rate of 93.99% for Canada goldenrod, but there was no significant difference between the two. Therefore, both application techniques can achieve the effect of controlling Canada goldenrod seedlings. Compared with the traditional application technique, the gradient dose application technique can save more than 67% of bio-enzymes.

[0032] As shown in Table 2, both bio-enzyme herbicide application techniques had significant control effects on Canada thistle plants during their growth phase (P < 0.05). Fourteen days after application, the Canada thistle plants withered and died. The traditional application method had a 91.77% mortality rate against Canada thistle, while the gradient-dose application technique had a 90.54% mortality rate, with no significant difference between the two. Therefore, both application techniques were effective in controlling Canada thistle plants during their growth phase. Compared to the traditional application technique, the gradient-dose application technique saved 26% of bio-enzymes.

[0033] As shown in Table 3, both bio-enzyme herbicide application techniques had a significant abortion effect on the flowering of Canada thistle during the growing season (P < 0.05). Fourteen days after application, the flowers of Canada thistle wilted. The traditional application method had an abortion effect on the flowering of Canada thistle of 88.67%, while the gradient dosage application technique had an abortion effect on the flowering of Canada thistle of 95.33%, significantly higher than the traditional application technique. Compared with the traditional application technique, the gradient dosage application technique increased the amount of bio-enzyme used by 16.7%, but significantly improved the abortion effect on Canada thistle.

[0034] Based on Experimental Examples 1 to 3, the gradient dosage application technology can save 76% of biological enzymes, achieve the same control effect on Canada thistle in the seedling and growth stages as the traditional application technology, and has a higher flowering abortion effect.

[0035] Although several embodiments of the present invention have been described herein, those skilled in the art will appreciate that modifications may be made to the embodiments herein without departing from the spirit of the present invention. The above embodiments are merely exemplary and should not be used as limitations on the scope of the present invention.

Claims

1. A method for controlling Canada goldenrod based on gradient application of pesticides, characterized in that: First, Canada goldenrod is divided into three stages according to plant height, namely, seedling stage, growth stage and flower bud differentiation stage. Bio-enzyme herbicides of corresponding concentrations are prepared and applied according to different stages of Canada goldenrod. The bio-enzyme herbicides include Canada goldenrod bio-fermentation liquid.

2. The method for controlling Canada thistle based on gradient application of pesticides according to claim 1, characterized in that: The plant height in the seedling stage is 0 to 30 cm; the plant height in the growth stage is 30 to 100 cm; and the plant height in the flower bud differentiation stage is greater than 100 cm.

3. The method for controlling Canada thistle based on gradient application of pesticides according to claim 2, characterized in that: The concentration of the biological enzyme herbicide used in the seedling stage is 1-1.5%, and the application amount is 50-60 L / mu; the concentration of the biological enzyme herbicide used in the growth period is 2-2.5%, and the application amount is 70-80 L / mu; the concentration of the biological enzyme herbicide used in the seedling stage is 3-3.5%, and the application amount is 90-100 L / mu.

4. The preparation method of a method for controlling Canada goldenrod based on gradient application of pesticides according to claim 3, characterized in that: The bio-enzyme herbicide comprises the following components by weight: 94-97% bio-fermentation liquid, 0.75-1% Tween 80, 1.5-2% paraffin oil, 0.1-0.2% xanthan gum and 1-2% azone. The bio-fermentation liquid is prepared by fermenting Canada goldenrod.

5. The preparation method of the method for controlling Canada thistle based on gradient application of pesticides according to claim 4, characterized in that: The application is done by manual spraying, the spraying device is a pressure sprayer, and the droplet size of the sprayer nozzle is 150 to 250 μm.

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