JPH06128109A - Herbicide for turf and method for weeding lawn - Google Patents

Abstract

PURPOSE:To obtain a herbicide for turf capable of growing turf by taking advantage of suppression of weeds in a turf land and to weed a lawn. CONSTITUTION:A herbicide for turf comprises coumarin in sweet vernalgrass as a main component. The herbicide comprises powder obtained by drying and grinding a plant of sweet vernalgrass or an extract of components prepared by extracting the plant of sweet vernalgrass with a solvent. The powder prepared by grinding the plant of sweet vernalgrass is applied to a lawn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawn herbicide and a lawn weeding method.

[0002]

2. Description of the Related Art Recently, simazine,
A large amount of herbicides such as prozamide is sprayed, and it is detected in nearby tap water, which has a problem of adverse effects on the environment.

[0003] Therefore, conventionally, in order to avoid adverse effects on the environment, measures have been taken such as collecting and treating the outflow with rainwater.

[0004]

However, with this countermeasure, it is not possible to collect a large amount of herbicide, and it is not possible to take a sufficient countermeasure.

Therefore, a herbicide or a herbicidal method, which replaces the conventional herbicide, is desired. As an alternative to the herbicide, a herbicide using a plant component having herbicidal activity against weeds has been proposed (for example, JP-A-61-20).
No. 0901) does not disclose any herbicidal effect on grass.

[0006] Therefore, the present inventor has conducted various studies on turfgrass and Hargaya and Chigaya, which are close to turfgrass, as weeds that suppress the growth of weeds that grow on turfgrass. It was found that the inhibitory effect on the

The present invention has been made on the basis of such findings, and its purpose is to suppress the growth of weeds in the grass, and to grow grass without deteriorating the environment. To provide a herbicide and a lawn weeding method.

[0008]

The herbicide according to claim 1 is mainly composed of coumarin. The herbicide according to claim 2 is mainly composed of coumarin in Hargaya.

The herbicide according to claim 3 is composed of powder obtained by drying and crushing a plant of Hurghaya. Claim 4
The herbicide according to (1) has an active ingredient as a component extract obtained by extracting a component of a Hargaya plant with a solvent.

The herbicide according to claim 5 is composed of a powder obtained by crushing the living body of Hurghaya. The lawn weeding method according to claim 6 is a method of spraying Hurghaya plants on grass.

[0011]

[Action] Coumarin has a strong allelopathic effect on weeds growing on grass and inhibits the growth of weeds.

[0012] Coumarin in Hurghaya has a strong allelopathic action against weeds growing on turf and inhibits the growth of weeds, whether it is a living body, a dried product or an extract.

[0013]

EXAMPLES The present invention will be described below based on examples.
When it was confirmed whether or not the turf had an allelopathic effect, there was no substance having a remarkable inhibitory effect, and it was difficult to make it a desired herbicide.

Then, among the grasses close to grasses, experiments were carried out on Hargaya and Chigaya. First, as substances having an allelopathic effect, there are coumarin (Coumarin) detected in Hargaya and scopoletin (S
copoletion).

Therefore, a solution of coumarin and scopoletin was added to the test plants to test the effect on the growth of the test plants. As the test plant, lettuce, which has a uniform growth and is used in many studies, was used.

The results of the experiment are shown in FIG. In FIG. 1, the vertical axis represents the control ratio of the aboveground length of lettuce, and the horizontal axis represents the concentrations of coumarin and scopoletin. As shown in Fig. 1, coumarin exerts an inhibitory action even at a trace concentration of about 0.1 ppm.
The inhibitory effect increased sharply from the vicinity of ppm, and at 100 ppm, the above-ground lettuce part hardly grew.

From this, it was confirmed that coumarin has an inhibitory effect on the test plant. On the other hand, it was confirmed that scopoletin exhibited a slight inhibitory effect on the test plant when the concentration was 10 ppm or more.

Next, an experiment was conducted on the effect of Hargaya and Chigaya on a test plant (white clover) growing on turf. Heated extract of dried leaves of Hurghaya and Chigaya was added to white clover radicle, which is one of the weeds growing on the lawn,
The effects on the growth of white clover radicles were studied.

The method for extracting the components from each plant is as follows. First, purified water is added to the dried leaves of each plant and heated, and the heat is turned off 10 minutes after the start of boiling.

Then, it is left for 30 minutes. Then, filter with Toyo filter paper No. 1 (coarse grain filtration). Furthermore, 0.8 μm
Filter again with a double eye filter (fine eye filtration). The result is shown in FIG. In FIG. 2, the vertical axis represents the control ratio of white clover radicle length, and the horizontal axis represents the extraction concentration.

As shown in FIG. 2, in Hurghaya, there is a control ratio of about 60% even when the extraction concentration is 0.1 g / l, and the inhibitory action surely increases as the extraction concentration increases.
On the other hand, when the extract concentration was not less than 1 g / l, the inhibitory effect equivalent to the extract concentration of 0.1 g / l of Hargaya could not be obtained in Tigaya.

In addition, when the extract concentration was about 5 g / l, the inhibitory effect on the extract was about 1 g / l of Hargaya. In other words, when the control ratio of white clover radicle length is 50%, the extract concentration of Hurghaya is 0.25 g / l.
However, the extraction concentration of the sea urchin was 1 g / l.

Further, when the control ratio of white clover radicle length was set to 25%, the extraction concentration of Hargaya was 1 g / l, but the extraction concentration of Chigaya was 5 g / l. As described above, when Hargaya was compared with Chigaya, it was found that it is necessary to have a high concentration of 5 to 10 times when it is desired to obtain an effect equivalent to the inhibitory effect of Hargaya, which is not preferable.

As is apparent from the results shown in FIGS. 1 and 2,
It was confirmed that coumarin extracted from the roots of Hurghaya and coumarin as a drug have an action of inhibiting the growth of white clover, which is a weed growing on turf, and sufficiently function as a herbicide.

Further, as a result of comparing the effects of Hurghaya and coumarin, 1 mg of Hurghaya root (dry weight) was found to have coumarin 5.4.
Equivalent to μg. Next, the effects of coumarin and roots of Hurghaya by the plant box method were compared.

The device is shown in FIGS. As shown in FIG. 3 and FIG. 4, a cylinder 2 having an inner diameter of 24 mm formed of a net material is arranged at the corner of a culture vessel 1 of 6 cm × 6 cm × 10 cm, and inside this cylinder 2, a root of Hargaya or a concentration of 10 ppm The agar medium containing the coumarin of is contained.

Then, the inside of the culture vessel 1 is set to an agar medium 3,
On this agar medium 3, 21 lettuce seeds 4 are planted. The coumarin in the roots of Hurghaya or the medium placed in the cylinder 2 dissolves into the agar medium 3 through the mesh and exerts an allelopathic action on the lettuce seeds 4.

When the allelopathic effect was exerted, the relationship between the root length of lettuce radicles and the distance from the outer edge 2a of the cylinder 2 containing the living roots of Hargaya or coumarin having a concentration of 10 ppm to each offspring 4 was confirmed.

The results are shown in FIG. As is clear from FIG. 5, the results obtained from the roots of Hurghaya and coumarin show similar results, demonstrating that the inhibitory effect of the roots of Hargaya is mainly due to coumarin.

On the basis of these results, when the living roots of Hargaya were crushed and the powder was applied to the grass, the growth of weeds such as white clover was suppressed. Similar results were obtained for living leaves of Hurghaya.

Further, similar results were obtained when Hargaya organisms were sprayed on the grass. In the above example, white clover was explained as a weed that grows on grass,
It is also effective for other weeds.

The field of application of the present invention is to grow lawns on golf courses, parks, and green areas.

[0033]

As described above, according to claims 1 to 6, when sprayed on grass, coumarin exerts an allelopathic action on the weeds growing on the grass, and the growth of the weeds can be suppressed.

As a result, it becomes possible to use the herbicide of the conventional pesticide system instead. Moreover, since it is a herbicide derived from plants, it is possible to grow grass without deteriorating the environment.

Further, the cost can be kept low as compared with the method of collecting and removing the pesticide once sprayed.

[Brief description of drawings]

FIG. 1 is a graph showing the influence of an allelopathic action candidate substance on the lettuce aerial length.

FIG. 2 is a graph showing the effect of a heated plant extract on white root clover radicle length.

FIG. 3 is a schematic explanatory view of an apparatus for comparing the actions of the roots of Hagaya by the plant box method and coumarin.

FIG. 4 is a plan view of FIG.

FIG. 5 is a graph for comparing the effects of coumarin with roots of Hagaya by the plant box method.

Claims (6)

[Claims] 1. A herbicide for turf, which comprises coumarin as a main component. 2. A herbicide for turf, which is mainly composed of coumarin in Hurghaya. 3. A herbicide for turf, which comprises a powder obtained by drying and crushing a plant of Hurghaya. 4. A herbicide for turf, which comprises a component extract obtained by extracting components of a plant of Hurghaya with a solvent as an active ingredient. 5. A herbicide for turf, which comprises a powder obtained by crushing a living body of Hurghaya. 6. A method of weeding a lawn, which comprises spraying a plant of Hurghaya on a lawn.