JPS5822441B2 - Shibafuyousentakuseijiyozai - Google Patents

Description

[Detailed description of the invention] The present invention relates to selective herbicides for lawns.

Turf grasses such as Noshiba, Korai Shiba, and Teifton are used in gardens, public grounds, golf courses, etc., and are important targets for weed control considering the area under cultivation.

However, because of the special nature of turfgrass, that is, it is necessary to always apply herbicides to areas where the foliage and foliage of turfgrass are thick, there is a need for a herbicide that does not affect the foliage of turfgrass even if the chemical is applied directly to the foliage of turfgrass. .

In other words, a high degree of selectivity between weeds and turfgrass is required.

Therefore, many herbicides have been used in fields and paddy fields, but only a limited number of them can be applied to turfgrass.

The present inventors have continued to research the use of benzylthiol carbamates as herbicides, and some of these compounds have already been widely used (and put into practical use) as herbicides for rice and field crops, but the process of this research has led to The present invention (r) S-
It was discovered that (2-chlorobenzyl)-N·N-diethylthiol carbamate (hereinafter referred to as TOCBT) has no specific phytotoxicity and high herbicidal activity against turfgrasses such as Noshiba, Korai Shiba, and Teifton, and the present invention completed.

The selective herbicide for lawns of the present invention uses this 0C as an active ingredient.
Contains BT.

The physicochemical properties of 0CBT are as follows.

Physicochemical properties: Colorless liquid that is sparingly soluble in water and soluble in organic solvents Boiling point: 136-140'C10.04-0.05 part mH
g Refractive index n16: 1.5643 The selective herbicide for lawns of the present invention is formulated into an emulsion or a granule depending on the intended use.

You can dilute the emulsion with water and use a sprayer to spread the granules by hand, or
Or spread it with a granulator.

It can be sprayed before or when weeds emerge, but it does not cause any harm to turfgrass, so it can be used year-round from early spring to late fall.

Formulation examples are shown below.

Formulation Example 1 Emulsion 0CBT 50 parts Emulsifier Tsurupol (registered trademark Toho Chemical 20 parts Kogyo Co., Ltd.) and xylene 30 parts are mixed and stirred to form an emulsion.

Formulation example 2 Granules QCBT 10 parts talc
45 parts bentonite
40 parts Sodium ligninsulfonate 2 parts and white carbon
Mix 3 parts uniformly, pulverize, add an appropriate amount of water, twist, granulate with an extrusion type granulator, and dry.
Grind into 2 meshes to make granules.

The herbicide of the present invention containing 0CBT strongly inhibits the growth and growth of annual weeds such as crabgrass and staghorn grass growing in lawns before or during germination, leading to their death.

The conventional lawn herbicide Simazine (registered trademark) dimethyltetrachloroterephthalate (TCTP) often exhibits phytotoxic effects such as discoloring the leaves of turfgrass and killing the tips of the leaves, and cannot completely control these annual weeds. Can not do it.

Furthermore, the rice field herbicide S-(4-chlorobenzyl)-N-N-di-f-tylthiol carbamate (benthiocarb), which is structurally similar to 0CBT of the present invention, may cause chemical damage to lawns due to the difference in the bonding position of chlorine. I can not use it.

The herbicide of the present invention can control herbicides without phytotoxicity.

An experimental example is shown below.

Experimental Example 1 Pot Test A plastic container with a surface area of 250 c4 was filled with field soil, and seeds of crabgrass, sycamore, Japanese knotweed, Japanese commonweed, and dayflower were sown, and then covered with soil.

Immediately dilute a predetermined amount of 0CBT emulsion in water and add 1501/
The soil surface was sprayed with an amount of water equivalent to 10A.

On the other hand, in order to examine chemical damage to turfgrass, the same chemical solution used to treat weeds was sprayed on wild grass, Korai grass, and Teifton that had been planted in the same container the previous year.

Benthiocarb and TCTP were used as control drugs.

An observational survey was conducted one month after treatment to determine the weed suppressing effect and chemical damage to turfgrass.

The results are shown in Table 1. The herbicidal effect is expressed as a numerical value from 0 to 5 (in this case, 0
5 indicates no effect and 5 indicates complete inhibition.

) The chemical damage to turfgrass is indicated by -, which is harmless, to small, medium, and large.

In fact, Experimental Example 2 Fill a plastic container with a surface area of 250 c4 with field soil, sow the seeds of crabgrass, sycamore, japonica, and dayflower, and immediately dilute the specified amount of the test agent in water.1507/10a A considerable amount of water was applied to the soil surface.

On the other hand, to check for chemical damage to turfgrass, the same chemical solution used to treat weeds was sprayed on wild grass, Korai turf, and Ti7ton 328, which had been planted in the same containers the previous year.

An observational survey was conducted one month after treatment to determine the weed suppressing effect and chemical damage to lawns.

The results are shown in Table 2. The herbicidal effect is expressed as a numerical value from 0 to 5 (0 indicates no effect and 5 indicates complete suppression). , shown in Taihokan-.

All comparative compounds in Table 2 are published under Japanese Patent Publication No. 43-29024.
It is a compound described in the No. No. and has the following structure.

Claims (1)

[Claims] A selective herbicide for lawns, comprising l5-(2-chlorobenzyl)-N-N-diethylthiol carbamate as an active ingredient.