JPH0466443B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a herbicide composition for both foliage and soil treatment for lawns. More specifically, the present invention can be applied to lawns, by spraying during the grass growing season.
In particular, the present invention relates to a herbicide composition that effectively and selectively controls annual and perennial weeds occurring in Korai lawn areas for a long period of time (that is, without causing chemical damage to the grass). [Industrial Application Fields] Herbicides have traditionally been widely used for agricultural purposes, but in recent years, as recreational and recreational facilities such as golf courses, parks, baseball fields, and gardens have become more popular, their use has increased. It has also come to be widely used to control weeds that grow on lawns in areas. [Prior Art] Generally, lawns are extremely suitable places for weeds to grow, and many types of weeds grow there. Furthermore, lawns are frequently mowed, and each time the lawn is mowed, weed seeds are repeatedly awakened from dormancy by sunlight, resulting in weed emergence (germination) that often lasts for a long period of time. Conventionally, weeds in lawns under such an environment have been controlled by applying soil treatment herbicides to the lawn in the spring (March to April) before weeds emerge. However, many soil treatment herbicides
Gradually decomposed and inactivated in the soil, approximately 2
This method has the disadvantage that the weed growth suppressing effect disappears after a few months, and as a result, the weed growth becomes significant in the summer season from July onwards. In order to improve these shortcomings, recently,
By applying a mixture of a foliar herbicide such as DSMA or Asiyaram to the soil herbicide mentioned above, existing weeds can be killed (foliar treatment (by using type herbicides) and to prevent the subsequent germination of summer weeds. However, the above-mentioned foliar treatment herbicides have the disadvantage that they cause chemical damage such as yellowing of grass during high temperatures in summer, and that they do not exhibit weed control effects on some weed species. In addition, it was actually time-consuming to mix two types of herbicides on-site. In short, even when using a mixture of conventionally known soil treatment herbicides and foliar treatment herbicides, it is possible to prevent weeds from emerging over a long period of time, and to kill existing weeds. The current situation is that there is no substance that has sufficiently satisfactory properties that do not cause drug damage. Therefore, in view of the above-mentioned current situation in the field of lawn herbicides, the present invention has been developed to be highly safe for lawns, have a wide range of herbicides, have a herbicidal effect on weeds that have advanced growth, and provide long-term weed control. The purpose of the present invention is to provide a herbicide that can be used to treat both foliage and soil, and which can maintain a germination-inhibiting effect. In order to achieve the above objective, as a result of various studies, 5-(N-phenylcarbomoylamino)-
The present invention was completed by discovering that a composition obtained by mixing 1,2,3-thiadiazole and S-triazine is an excellent herbicide for both foliage and soil treatment that achieves the above objectives. [Structure of the Invention] That is, the present invention provides 5-(N-phenylcarbamoylamino)-1,2,3-thiadiazole and the general formula (However, in the formula, Y represents a chlorine atom or a methylthio group, R ¹ represents an ethylamino group or an isopropylamino group, R ² represents an ethylamino group,
(representing a diethylamino group, isopropylamino group or dimethylpropylamino group)
The present invention relates to a lawn herbicide composition containing -triazine as an active ingredient. 5-(N-phenylcarbamoylamino)-1,2,3-thiadiazole used in the present invention is a known substance and has already been tested as a foliar treatment type herbicide during the growing season of lawns. However, when used alone, thiadiazole is less effective against weeds of the grass family, including grasshopper.
Moreover, it had the disadvantage of slow onset of effects (requiring a long period of two months or more to complete). Further, some of the S-triazines of the general formula () are already commercially available and used as soil treatment herbicides for lawns. However, when used alone, the triazine is less effective after weeds have emerged (i.e., on grown weeds);
In particular, this chemical had the disadvantage of not showing any herbicidal effect on the major weed grasshopper at a concentration safe for lawns. In short, each of the active ingredients of the composition of the present invention cannot achieve the object of the present invention by itself. In contrast, the herbicide compositions of the present invention each have the above-mentioned drawbacks when used alone.
It contains phenylcarbamoylamino)-1,2,3-thiadiazole and S-triazine of the general formula () as active ingredients. Nevertheless, the compositions of the present invention exhibit a significantly higher synergistic herbicidal effect (particularly by foliage treatment) than when each is used alone, and also show a significantly higher synergistic herbicidal effect (particularly by foliage treatment), as well as suppressing weeds up to the 5-leaf stage after germination. It has a completely new and superior performance that has never existed before: it effectively acts on even plants, has a wide range of herbicidal grass species, expresses herbicidal efficacy extremely quickly, and has the effect of suppressing weed germination for a long period of time. It is something. 5-(N-phenylcarbamoylamino)-1,2,3-thiadiazole used in the present invention can be produced, for example, by the method described in Japanese Patent Publication No. 52-42853. Examples of the S-triazine represented by the general formula () used in the herbicide composition of the present invention include 2-chloro-4,6-bis(ethylamino)-S-triazine (compound 1) 2-chloro-4 -ethylamino-6-isopropylamino-S-triazine (compound 2) 2-chloro-4-diethylamino-6-ethylamino-S-triazine (compound 3) 2-methylthio-4,6-bis(ethylamino)- S-triazine (compound 4) 2-methylthio-4,6-bis(isopropylamino)-S-triazine (compound 5) 2-methylthio-4-ethylamino-6-isopropylamino-S-triazine (compound 6) 2 -Methylthio-4-(1,2-dimethylpropylamino)-6-ethylamino-S-triazine (Compound 7) and the like. In the present invention, the S-triazine of the general formula () is disclosed in, for example, Japanese Patent Publication No. 39-1718,
It can be produced by the method described in Publication No. 18316 and the like. In addition, in the following description, compounds 1 to 7 represent the above-mentioned compounds 1 to 7, respectively, and compound A represents the above-mentioned 5.
-(N-phenylalbamoylamino)-1,2,
3-Thiadiazole shall be indicated. The herbicidal composition of the present invention can be used in any formulation form, such as a wettable powder, emulsion, fine granule, or powder. In formulating the formulation, for example, talc, bentonite, clay, kaolin, diatomaceous earth, etc. can be used as a solid carrier, and for example, benzene, alcohols, acetone, xylene, cyclohexanone, etc. can be used as a liquid carrier. I can,
Further, as a surfactant, for example, alkyl sulfates, alkyl sulfonic acids, polyethylene glycol ethers, polyhydric alcohol ethers, etc. can be used. In the composition of the present invention, 0.1 of the S-triazine of the general formula () is added to the weight part of the compound Al.
It is particularly preferable to use them in a mixed proportion of 10 parts by weight. The herbicidal composition of the present invention can be used in much the same way as, for example, 5-(N-phenicarbamoylamino)1,2,3-thiadiazole.
That is, the herbicide composition is sprayed on the foliage of weeds, and the foliage is removed one to two weeks after the spraying. Conveniently, the purpose of removing the foliage can be accomplished by mowing the lawn.
This is because weeds are cut along with the lawn. Next, the present invention will be specifically explained with reference to Examples and Test Examples. However, the present invention is not limited only to the following examples. Note that % is a weight percentage. Examples 1 to 5 (Blending Examples) According to the blending ratio shown in Table 1, each blended substance was uniformly mixed and pulverized to form a powder (Example 1) and a wettable powder (Examples 2 and 3), Each compounded substance was uniformly mixed to form an emulsion (Example 4), each compounded substance was uniformly mixed, water was added, kneaded, and then granulated and dried to obtain a granule (Example 5). In addition, when using the composition of each example, it can be directly sprinkled with a duster (Example 1), appropriately diluted with water and sprinkled (Examples 2, 3, 4), or directly sprinkled (Example 1). Example 5).

【table】

[Table] Test example 1 (weed killing example) Field soil was filled in a pot with a diameter of 15 cm, and seeds of crabgrass were sown on the top soil, mixed in a 1 cm layer, tamed,
The plants were watered and grown to the three-leaf stage. Next, crabgrass (three-leaf stage) was treated with compound A and compound 1 or compound 3.
The leaves were treated with herbicides in various proportions, and 10 days after the treatment, the plants were cut to a height of 1 cm from the ground. Thirty days after the foliage treatment, the fresh weight of the remaining weeds was measured, and the remaining ratio (%) of crabgrass was calculated using the following formula. Remaining ratio = fresh weight of crabgrass in treated area/fresh weight of crabgrass in untreated area x 100 The results are shown in Table 2. The weed survival ratio for single use of Compounds A, 1, and 3 was determined using the same procedure as above, and is also shown in Table 2. Furthermore, the expected value of remaining grass obtained according to the following formula by Mr. Colby is shown in parentheses in Table 2. Expected value of residual weeds from mixture (%) = X (%) x Y (%) / 100 (However, In Table 2, the fact that the actual residual ratio of weeds is smaller than the expected residual ratio of weeds in parentheses means that there is a synergistic effect due to the combined use of the two compounds.

[Table] Test example 2 (weed killing example) Fill a pot with a diameter of 15 cm and fill it with field soil, making it 1.5 cm thick.
The soil containing weed seeds was filled and compacted. Furthermore, blocks of Korai grass (5 cm x 5 cm) were transplanted, placed in a greenhouse, and grown and managed. After the weeds emerge, the grasshopper: 2 to 5 leaf stage, the grasshopper: plant height 5 cm, the grasshopper: the 4 to 5 leaf stage,
At the 4-5 leaf stage for Japanese knotweed and at the 2.5 leaf stage for plantain, add the prescribed amount of each compounded hydrating agent per square meter (m ² ).
The mixture was diluted in 200 ml of water and sprayed, and 10 days after the treatment, the grass and weeds were cut to a height of 1 cm from the ground. The herbicidal evaluation was carried out by visual observation 30 days after the spraying treatment, divided into the following 11 stages. 0: Weed killing rate 0% 1: 〃 0-10% 6: Weed killing rate 50-60% 2: 〃 10-20% 7: 〃 60-70% 3: 〃 20-30% 8: 〃 70-80% 4 : 30-40% 9: 80-90% 5: 40-50% 10: 99-100% The results obtained are shown in Table 3.

【table】

[Table] Test Example 3 Field soil was placed in a pot with a diameter of 15 cm, and soil containing seeds of field weeds was filled to a surface layer of approximately 1 cm. Furthermore, Korai grass and sod were transplanted, and after watering, a predetermined amount of each compounded hydrating powder was diluted to 200 ml of water per square meter (m ² ) and uniformly spread on the soil surface. The survey measured the fresh weight of weeds 20 days after treatment,
The results are shown in Table 4 in terms of the untreated plot ratio.

【table】

〔Effect of the invention〕

As is clear from the herbicidal test results shown in Table 2, the composition of the present invention contains Compound A [5-(N-phenylcarbamoylamino)-1,2,3-thiadiazole] and Compound 1, 3 [S-triazine]
It has a synergistic herbicidal effect on crabgrass compared to single use. Furthermore, as is clear from the herbicidal test results shown in Table 3, the composition of the present invention is effective in controlling a wide variety of weeds, and has no chemical damage to lawns, which is unprecedented. It also has completely new effects. Furthermore, as shown in Table 4, the composition of the present invention not only kills weeds after germination, but also has the effect of suppressing weed germination without causing chemical damage to lawns.

Claims (1)

[Claims] 1 5-(N-phenylcarbamoylamino)-
1,2,3-thiadiazole and general formula (However, in the formula, Y represents a chlorine atom or a methylthio group, R ¹ represents an ethylamino group or an isopropylamino group, R ² represents an ethylamino group,
(representing a diethylamino group, isopropylamino group or dimethylpropylamino group)
- A herbicide composition for lawns containing triazine as an active ingredient.