JPH0422882B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides 2,4,6-trichlorophenyl-
4-nitrophenyl ether (hereinafter abbreviated as CNP) and 2-chloro-4,6-bis(ethylamino)-S-triazine (hereinafter abbreviated as CAT)
or 2-chloro-4-ethylamino-6-isopropylamino-S-triazine (hereinafter ATZ
It is abbreviated as. ) as an active ingredient, and is particularly intended for weed control in lawns. Recently, lawns have become widely used in sports facilities such as baseball fields and soccer fields, and recreational facilities such as golf courses, parks, and gardens, and are extremely useful for preventing danger and for aesthetic purposes. Also hospitals, food factories,
In places such as precision machinery factories and airports, in addition to being aesthetically pleasing, they also play a role in preventing dust. However, managing these lawns requires a lot of effort and requires careful attention to weed control, pest control, mowing, top dressing, and fertilization. Currently, CAT, 1-(2
-Methylcyclohexyl)-3-phenylurea (sideuron), 0,0-diisopropyl-S-
(2-benzenesulfonylaminoethyl) phosphorodithioate (SAP), dimethyltetrachloroterephthalate (TCTP), etc. are used as pre-emergence soil treatment agents for lawns, and 2,4- Dichlorophenoxyacetic acid (2,4-PA), 2-(2-methyl-4-chlorophenoxy)propionic acid (MCPP), disodium methane arsonate (DSMA), and the like are used. Among these, CAT is not sufficiently effective against perennial weeds such as Oxalis and Chidomegusa, and often causes chemical damage when sprayed in increased amounts. It cannot be used because of this. Also, SAP
TCTP is less effective against Sparrowgrass and broad-leaved weeds and requires large doses. 2,4-PA and MCPP, which are used as foliage treatment agents, are selectively effective against broad-leaved weeds, but have no effect on grass weeds, and DSMA is less effective against grass weeds and is often Each has its own drawbacks, such as causing chemical damage at high temperatures. Therefore, the present inventors developed a herbicide that can be safely used on lawns and can control not only annual broad-leaved, grass, and Cyperaceae weeds, but also many perennial weeds that could not be adequately controlled with conventional herbicides. The present invention was completed as a result of extensive research into agents. Originally, CNP exhibits strong weed suppressing power before and after the germination of annual weeds, but during the weed growth period, it shows considerable activity against broad-leaved weeds, but is inferior to grass weeds. Furthermore, CAT and ATZ each have a weakness against grass weeds when used alone, and cannot completely control weeds in lawns. The present inventors discovered that among various combinations of herbicides, the herbicide composition of the above combination did not cause any harm to lawns, and was found to be effective against grass weeds such as grasshopper, sycamore, and sycamore, as well as cyperus spp. It exhibits high effects against broad-leaved weeds such as knotweed, pigweed, Japanese oxalis, and Japanese clover, which are not found in individual agents, and also has strong weed suppressing power against difficult-to-control perennial weeds such as Chinese knotweed, Oxalis oxalis, Japanese clover, and other hard-to-control perennial weeds. This is because the combination of CNP and CAT or CNP and ATZ exhibits a high synergistic effect. CNP, which is an active ingredient of the herbicide composition of the present invention, and
The dosage of CAT or CNP and ATZ can be significantly reduced compared to when each is used alone, but the mixing ratio of both compounds is 0.05 to 5 parts by weight of CAT or ATZ per 1 part by weight of CNP. Preferably, it is appropriate to use 0.1 to 1 part by weight of CAT or ATZ per 1 part by weight of CNP. The composition of the present invention is most effectively used when formulated into a wettable powder, but it can also be used in the form of an emulsion, flowable, powder, or granule. In the case of wettable powders, emulsions, and flowables, they are diluted with an appropriate amount of water, and powders and granules are sprayed as they are. be scattered. Furthermore, if necessary, it is also possible to use them in combination with insecticides, fungicides, fertilizers, or other herbicides, or to formulate formulations. Next, examples of the present invention will be given, but the present invention is not limited thereto. All mixing ratios in the examples indicate weight ratios. Example 1 Wettable powder CNP 30 parts, CAT 6 parts, white carbon 10 parts,
50 parts of diatomaceous earth, 2 parts of sodium ligninsulfonate and 2 parts of sodium dodecylbenzenesulfonate are mixed and ground to obtain 100 parts of a wettable powder. Example 2 Wettable powder CNP 30 parts, ATZ 10 parts, white carbon 10 parts,
47 parts of clay and 3 parts of polyoxyethylene nonylphenol ether are mixed and ground to obtain 100 parts of a wettable powder. Example 3 Emulsion 20 parts of CNP, 6 parts of CAT, 64 parts of ortho-xylene,
Mix 10 parts of a nonionic surfactant to obtain 100 parts of an emulsion. Example 4 Microgranules 15 parts CNP, 5 parts ATZ, 55 parts bentonite, 22 parts talc, 1 part sodium dodecylbenzenesulfonate
After mixing 2 parts of sodium ligninsulfonate, an appropriate amount of water is added, kneaded, and granulated using a granulator in a conventional manner to obtain 100 parts of fine granules. The effects of the present invention will be specifically illustrated below using test examples. Test Example 1 Lawn weeding test using weed pre-emergence treatment A second-year-old Korai lawn was evenly topped with soil mixed with weed seeds, forcibly mixed into the soil with a rake, and then watered and established. After 3 days, a predetermined amount of a wettable powder of the test compound was diluted with water and uniformly sprayed using a small sprayer. The test size was 4 m ² (2 m x 2 m) per area, and a weed sampling survey was conducted on the 60th day after chemical treatment, and an observation survey for chemical damage was conducted on the 30th day, and the results were converted into an index according to the following procedure. The results are shown in Table 1.

【table】

【table】

[Table] Test Example 2 Lawn weeding test by treatment during the weed growth period An emulsion of the test compound was diluted with water at the prescribed dose before the sprouting of the Korai grass, during the growth period of Psyllium annuus, Psyllium annuus, Chickweed, Oxalis oxalis, and Oxalis. Spread evenly with a small sprayer. The test size was 3 m ² (1.5 m x 2 m) per area, and a weed sampling survey was conducted 30 days after chemical treatment.
The results are shown in Table 2 according to the above procedure.

[Table] The excellent synergistic effect brought about by the herbicidal composition of the present invention can be fully understood from the herbicidal effects shown in the above test examples, and will be explained in more detail below. The following method is usually used to test for interaction between any combination of two herbicides. (Refer to Hideo Chisaka, "Interaction test of mixed herbicides using equal effect line method," Weed Research 15 , 16-20 (1973)) The doses of herbicides A and B that produce an effect of p% when used alone are m and n, respectively. shall be. Mixture C of both drugs is the same p
% effect, the relationship x _A /m + x _B /n = 1 holds between the dose of drug A x _A and the dose x B of drug _B if both drugs have additive effects. . This is called the p% isoeffect line in the additive action of agents A and B. Using this line of additive action as a reference, if the isoeffect line is below, it indicates a synergistic effect, and if it is above, it indicates an antagonistic effect.
(Fig. 1) Next, the herbicide composition of the present invention (CNP+CAT)
is shown as an example. Based on the measured air-dry weight of crabgrass, the growth suppression rate for each plot was calculated using the untreated plot as a standard and organized as shown in Table 3. Based on this table, plot the drug dose that achieves 90% inhibition on the diagram as shown in Figure 2.
An isoeffect line of 90% inhibition was obtained. As is clear from Fig. 2, the iso-effect line for 90% inhibition of the growth of CNP in the mixed treatment of CNP and CAT is below the line representing the additive effect, and it is clear that the mixed use of both drugs shows a synergistic effect. It is. Test Example 3 Interaction test using the iso-effect line method Fill an a/10000 pot with 1 kg of field soil,
To this, 0.3 g each of N, P ₂ O ₅ and K ₂ O is applied as a chemical fertilizer to the entire layer. Sow a certain amount of crabgrass seeds in this area, cover with soil, and water thoroughly. Next day CNP
The specified amount of each hydrating powder of CAT and CAT was applied to the soil using a small sprayer, and 30 days after the treatment, the crabgrass was extracted and its air-dry weight was measured to determine the growth inhibition rate.
Shown in the table.

【table】 [Brief explanation of drawings]

FIG. 1 illustrates the effects of the mixture using iso-effect diagrams, and FIG. 2 illustrates the additive effects of the herbicide composition of the present invention. 1... Line of additive action (x _A /m+x _B /n=1), 2... Line showing additive effect, 3... Line of 90% inhibition isoeffect.

Claims (1)

[Claims] 1 2,4,6-trichlorophenyl-4-nitrophenyl ether and 2-chloro-4,6-bis(ethylamino)-S-triazine or 2-chloro-4-ethylamino-6-isopropylamino- A herbicide composition for lawns, comprising S-triazine as an active ingredient.