JPH04230301A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide a herbicide composition comprising plural specific chemical ingredients, having a herbicidal range exceeding the application ranges of the chemical ingredients, rapidly exhibiting a herbicidal effect exceeding the herbicidal effects of the chemical ingredients in reduced amounts of the ingredients and having improved safety for corns. CONSTITUTION:A herbicidal composition comprises (A) one kind or more of compounds of formula I (R1 is phenyl which may be substituted; R2 is halogen, alkoxy, alkylthio, alkylsulfonyl, alkyl, alkoxyalkyl alkoxycarbonyl) or salts thereof, and (B) one kind or more of atrazine, cyanazine, bentazon, bromoxynil, 2,4-D, dicamba, nicosulfuron and premisulflonemethyl preferably in an A:B weight ratio of 4:1 to 1:25 as active ingredients. The herbicidal composition has good selectivity for corns and exhibits a high herbicidal potency against Setaria viridis, Xanthium strumarium, etc., which are important weeds in corn upland fields.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a herbicidal composition.

0002

BACKGROUND OF THE INVENTION In the cultivation of agricultural and horticultural crops, many herbicides have come to be used for weed control, which has required a great deal of labor. However, because they cause chemical damage to crops and remain in the environment, contaminating the environment, there is a desire to develop a drug that is both effective at lower doses and safe to use.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a herbicidal composition that is selective to corn and highly effective against important weeds in corn fields, such as hackberry and scallion.

0004

[Means for solving the problems] The present invention

[Formula 2] (In the formula, R1 is phenyl which may be substituted, R2 is the same or different, and represents halogen, alkoxy, alkylthio, alkylsulfonyl, alkyl, alkoxyalkyl, alkoxycarbonyl, and n is 0 to 4, and R3 and R4 are the same or different and represent hydrogen or lower alkyl. This is a herbicidal composition characterized by containing as an active ingredient at least one compound selected from the group consisting of D., dicamba, nicosulfuron, and primisulfuron-methyl.

The above phenyl substituents for R1 are the same or different and are halogen, hydroxy, nitro, cyano, alkyl, alkenyl, haloalkyl, haloalkenyl, alkoxy, haloalkoxy, haloalkenyloxy, alkylthio, alkenylthio, Alkynylthio, haloalkylthio, haloalkenylthio, monoalkylamino, dialkylamino, alkoxyalkylthio, alkylthioalkylthio, alkoxycarbonyl,
alkylcarbonylalkoxy, alkylcarbonyl,
Alkoxyamino, alkylsulfonyl, alkenylsulfonyl, alkynylsulfonyl, alkoxyalkylsulfonyl, alkylthioalkylsulfonyl, alkylsulfonylalkylsulfonyl, haloalkylsulfonyl, alkoxycarbonylalkylthio, alkoxycarbonylalkylsulfinyl, alkoxycarbonylalkylsulfonyl, alkylamido, aralkyloxy, substituted means an optionally substituted phenyl, an optionally substituted aralkyl, an optionally substituted heterocycle, and an alkyl group substituted with an optionally substituted heterocycle.

The compound represented by formula 2 or its salt is disclosed in Japanese Patent Application No. 2-174421 and can be produced by the following method. Manufacturing method (a) Manufactured by chemical formula 3.

embedded image (In the formula, n, R1, R2, R3, R4 have the same meanings as above, Q is a leaving group, and means halogen, alkylsulfonate, phenylsulfonate, etc.)

[
Production method (b) Among the compounds shown by formula 2, when the 5-position of the bicyclo ring is monosubstituted other than alkoxycarbonyl, it can also be produced according to formula 4.

[C4] (In the formula, r represents alkyl.)

Suitable agronomically acceptable salts include salts such as sodium, potassium, calcium and ammonium salts.

[0009] Hereinafter, the compound represented by chemical formula 2 will be referred to as [A],
[B
].

[0010] The composition of the present invention, which is a combination of [A] and [B], has a wider range of herbicidal applications beyond the scope of application obtained with each single agent, and at the same time, the herbicidal effect is completed more quickly. was achieved, and furthermore, it was found that the effects were sufficiently exerted at lower doses than those used alone, safety on corn was ensured, and sufficient herbicidal effects were exhibited with a single foliage treatment.

[0011] The practical blending weight ratio of [A]:[B] is preferably 4:1 to 1:25, more preferably 1:1 to 1:25.
It is 1:125.

When applying the herbicidal composition of the present invention, the above-mentioned active ingredient compounds [A] and [B] are mixed with various auxiliaries according to the usual method of formulating agrochemicals, and prepared in the form of, for example, a wettable powder or an emulsion. However, the active ingredient compounds may be mixed and formulated at the same time, or separately formulated products may be further mixed. Examples of carriers or diluents include inert solid carriers such as clay, talc, bentonite, calcium carbonate, diatomaceous earth, white carbon (silica), and inert liquid carriers such as water or organic solvents. Surfactants and various polymeric compounds may be added to enhance biological effects or improve the properties of the preparation. Of course, it is not limited to these.

[0013]

[Examples] Next, the present invention will be further explained with reference to Examples and Reference Examples. Parts represent parts by weight. The above is mixed uniformly and finely pulverized, and the active ingredient is 26.6%.
% hydration agent was obtained.

[0014] The above was mixed uniformly and finely ground to obtain a wettable powder containing 20% of the active ingredient.

[0015]

[0016]

[Effects of the Invention] Test Example 1 A pot of 200 cm2 was filled with soil, and seeds of Golden foxtail, Onna fir, and corn (variety: Pioneer 3358) were sown on the surface layer, lightly covered with soil, and grown in a greenhouse. When the height of the corn plant grew to about 23 cm, and that of the golden yellow foxtail and Japanese thorns to a height of 9 to 12 cm, the test chemical was adjusted to the prescribed concentration according to the example, and sprayed in a small sprayer at a rate of 50 liters/10 a. It was evenly sprayed on the stems and leaves of the plants. Three weeks after the treatment, the herbicidal effect on plants was investigated according to the following investigation criteria, and the results are shown in Table 1.

[0017] Also, the numerical values of 1, 3, 5, 7, and 9 are 0, 2, and 2, respectively.
and 4, 4 and 6, 6 and 8, and 8 and 10. The herbicide rate was calculated using the following equation 1.

[0018]

[Math 1]

[0019]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

Claims (1)

[Claims] Claim 1: Formula 1 [Formula 1] (wherein R1 is phenyl which may be substituted, R2 is the same or different, halogen, alkoxy, alkylthio, alkylsulfonyl, alkyl, alkoxyalkyl, alkoxycarbonyl , n represents 0 to 4, and R3 and R4 are the same or different and represent hydrogen or lower alkyl) or at least one salt thereof, and atrazine, cyanazine, bentazone. , bromoxynil, 2,4-D, dicamba, nicosulfuron, and primisulfuron-methyl as an active ingredient.