JPS5846008A - Herbicidal composition - Google Patents

Abstract

PURPOSE:A herbicidal composition having a sufficient herbicidal effect on narrow leaf plants and broadleaf plants, immediate herbicidal effect and durability, comprising an alkali cyanate and a specific another herbicidal compound as active ingredients. CONSTITUTION:A herbicidal composition obtained by blending at least one selected from a salt and ester of alpha-[4-(5-trifluoromethyl-2-pyridyloxy)phenoxy]propionic acid, a salt and ester of alpha-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionic acid, 2-chloro-4-trifluoromethyl-4'-nitrodiphenyl ether and N-(3,4-dichlorophenyl) cyclopropanecarboxyamide with an alkali cyanate in a blending ratio of preferably 1:(50-600)(pts.wt.)

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a herbicidal composition containing an alkali cyanate and a specific other herbicidal compound as active ingredients.

Weeds that are the target of herbicide spraying are generally a mixture of many types, and the growth stages of each weed individual at the time of herbicide application are also diverse, so it is necessary to suppress all weeds to a satisfactory degree by applying pesticides. This may involve considerable difficulty. In particular, chemical weeding from spring to summer in weed-rich areas must act quickly on fast-growing weeds, maintain its effect over a long period of time, and suppress the regeneration of weeds once they have died. Still new - drug curses are in demand.

Q-(4-(5-)lifluoromethyl-2-pyridyloxy)phenolpropionic acid (hereinafter referred to as TFPP acid and (
・Salts and esters of (c) are described in JP-A-54-22371-1 and JP-A-54-119476 as ff-[4-
Salts and esters of (3,5-dichloro-2-pyridyloxy)phenoxy]propionic acid (hereinafter referred to as DCPP acid) are disclosed in Japanese Patent Publication No. 53-27768. Nitrodiphenyl ether (hereinafter referred to as TNDE) was produced by the Special Publication Act in 1984-33
These are known herbicidal compounds described in Publication No. 129. These have a herbicidal effect on grasses at low concentrations even in plants that have advanced in growth, but the onset of the herbicidal effect is not rapid, and growth gradually slows down from about 7 to 10 days after spraying. It usually stops and clear effects appear after about two weeks. In addition, broad-leaved plants include
It has little effect even at high doses.

Also, N-(3,4-dichlorophenyl)sifurob aI
(Carboxamide (hereinafter referred to as DCCA) is described as a herbicidal compound in Japanese Patent Publication No. 1983-839, and shows herbicidal effects on a relatively large number of grass species, but its activity is generally rather low. Moreover, it takes 4 to 5 days for the herbicidal action to occur.

On the other hand, alkaline cyanate is a herbicide that is widely known and has been put into practical use, and it has a great herbicidal effect on broad-leaved plants regardless of the size or type of the individual, but it is effective against narrow-leaved plants such as Poaceae. , the herbicidal effect is poor even when applied at high doses. In addition, the onset of the unveiling effect is extremely rapid and is completed within 2 to 3 days at the latest from the day of application, but plants that cannot be completely killed often regrow and flourish afterwards.

The purpose of the present invention is to provide a herbicidal composition that (1) has a sufficient herbicidal effect on both narrow-leaved and broad-leaved herbicidal plants, and (2) has a rapid and long-lasting herbicidal effect. be.

alkali cyanates and salts and esters of TFPP acid;
DCPP acid salts and esters, TNDE and DC
By using CA in combination with at least one member of the group, (1) it can be used against a wide variety of weeds from broad-leaved to narrow-leaved and at different growth stages with a lower potency than when using each alone; (2) Its herbicidal action is fast-acting, and the action is completed within 2 to 3 days from the day of application. (3) It was found that even after that, the weed suppression crop continued for a long time and prevented the regrowth of weeds.

The present invention provides a herbicidal composition containing as active ingredients at least one selected from the group of TFPP acid salts and esters, DCPP acid salts and esters, TNDE, and DCCA, and alkali cyanate. It is a thing.

Examples of the salts and esters of TFPP acid and DCPP acid include salts with cations such as sodium, potassium, and ammonium, and esters with lower alkyl groups such as methyl, ethyl, 1so-propyl, n-propyl, and lobethyl.

In addition, examples of alkali cyanates include sodium cyanate and cyanogen forged calicar.

The above two types of active ingredients are uniformly mixed in advance together with additives, auxiliaries, etc. added as necessary to form a herbicidal composition. It can be stored stably in a dry state and is convenient to use as is or diluted with water.
The blending ratio of both active ingredients to fully exhibit the effect of mixing is usually 50 to 600 parts by weight of alkali cyanate to 1 part by weight of TPPP acid, DCPP acid salt, ester, TNDE or DCCA. .

4- As additives and auxiliary agents to be added, those commonly used in agricultural chemicals, such as various surfactants, spreading agents, solid or liquid carriers, can be appropriately selected and used. It is usually formulated into aqueous solutions, wettable powders, powders, granules, etc.

The present herbicidal composition can be applied, for example, before sowing or planting of broad-leaved crops in field crops to quickly bring about a herbicidal effect.
The weed suppressing effect can be sustained without damaging broad-leaved crops that are sown and planted several days later. In addition, it has a strong herbicidal effect on various weeds over a wide range, so it is of course highly practical as a herbicide for forest land and non-agricultural land.
It can also be applied to clearing undergrowth in gardens, ridges in rice fields, and mowing marks.

The amount of application varies depending on the type of weeds in the area to be sprayed, the growth status, etc., and cannot be generalized, but the amount of application per 10 are is 10 to 2 for salts and esters of TPPP acid and DCPP acid.
00g preferably 50-100g, TNDE 50-4
00g preferably 50-200g, DCCA 100-200g
1000 g, preferably 200 to 500 g, and alkali cyanate 2 to 5 kg, preferably 3 to 4 kg, which are slightly smaller amounts than when each is used alone.

The synergistic action of both active ingredients in the present invention 5- (as described above) or as will be further described later) brings about an excellent effect that would not be expected from the use of each separately.This mechanism is as follows. It is estimated that it is as follows.

Alkali cyanate violently destroys the epidermal tissue of plants when it comes into contact with them, and exerts sufficient killing power on plants with exposed growing points, but it is effective against plants with advanced growth stages such as gramineous plants. The leaves are surrounded by leaf sheaths made of epidermal cells with developed growing points, so they do not die and regenerate. However, even on the hard epidermis of gramineous plants, alkaline cyanate has many minute valence effects, and these are caused by TFPP acid, DC
It seems to promote the uptake of PP acid salts, esters, TNDE, and DCCA into the plant body through the epidermis. Normally, when alkali cyanate and other agents are combined, the herbicidal activity of the other agent is often not expressed, and the time required for the alkali cyanate to attach to the epidermal tissue is relatively short, so during this time, the other agent absorbs and penetrates. It was thought that TFPP acid, DCPP acid salts, esters, T
In the case of NDE and DCCA, they have the property of being easily absorbed in a relatively short period of time through the epidermis where they have been added with alkali cyanate. In the present invention, by combining these two components, TFF'P1. DCP
Excellent herbicidal effects can be achieved by quickly harvesting and permeating P acid salts, esters, TNDE, or DCCA, and quickly translocating them within the plant body.

7- Test Example 1 Using a pot of 115.0007 ml, edible vinyl was grown in a field of silver. When the plant height was 25cm, 15% of the test chemical was applied.
A spray solution was prepared by diluting it with 1/a water and sprayed on grass leaves. On the 6th and 144th day after the treatment, the growth condition of the edible vinyl was visually observed, and the results shown in the following table were obtained. Regarding the evaluation value of the growth state in the table, 6 indicates the same as the untreated plot, and 5 indicates complete growth inhibition.

Table 1 Sodium cyanate 2% al-
Butyl 1,5TFPP 0.1%
14〃 + Sodium cyanate 2% 55 DCPPII indah 0.1% 1
41 + Sodium cyanate 2% 557IDE
O, 1% 2 4.
5-5 Juunan Shun Soda 2% 55 According to the results in the table above, the mixture of the present invention exhibits a herbicidal effect extremely quickly on mature gramineous plants, and is more synergistic than each single agent. It can be seen that the herbicidal effect is maintained over a long period of time.

8- Test Example 2 Wheat and Japanese knotweed were grown in a field of silver using a 115.0OQ7-L pot. Wheat at 6-7 leaf stage, Japanese knotweed at 1 stage
When the 0-leaf stage was reached, the test chemical was diluted with 151/a water to prepare a spray solution, and the foliage was sprayed. After processing 6
On the 144th day, the growth condition of the plants was observed in the same manner as in the previous example, and the results shown in the following table were obtained.

In addition, sodium cyanate A is 81% Na0CN and Na2C.
B is an industrial product containing 98% Na0CN.

Table 2 Sodium cyanate A2% 4.5
2.5・35 5TFPPII Butyl 125ppm
0 2 0" OI + Sodium cyanate A 2% 5 4.5 5 5#
□+Sodium cyanate B 2% 5 4 5 5TF
Butyl PP acid 250 Usaka 0 4 0
01 + Sodium cyanate A 2% 5 4.
5 5 5 + Sodium cyanate B 2%
5 4 5 5TFPP transparent butyl 500pp ring
0 4 0 09- TFPP clear butyl 500ppm O
400 + cyan soda A 2% 5 5
5 5~ + Sodium cyanate B 2% 5 5
5 5DCPP forging soda 125ppm
0 2 0 0 + Sodium cyanate A 2
% 5 4 5 5〃 +Cyanic acid N-da B 2
% 5 3 5 5DCPPa'/-da250ppm
' 0 3.5 0 0
1 + Sodium cyanate A 2% 5 4 5 5
〃 + Cyanic acid N-da B 2% 5 3 5 5
DCPP III inductor 500ppm
O3,5-400-+Sorg Cyanate A 2%
5 5 5 5 + Sodium cyanate B 2%
5 5 5 5TNDE12S9911
0-1 2.5 0 01
+ Sodium cyanate A 2% 5 5 5 5
+ Sodium cyanate B 2% 5 5 5 5TN
DE250ppm G-1
400 + Sorg Cyanate A 2% 5 5
5 5 + cyanic acid N-da B 2% 5 5
5 5TNDE6001) p-〇-14,5001 + cyanate forged soda A 2% 5 5 5 5U + cyanate soda B 2% 5 5 5 510- Test Example 3 A test plot of 1 section 2112 was established at the edge of an outdoor area where weeds were overgrown. The test chemical was diluted with 151/a water to prepare a liquid solution, which was sprayed onto the stems and leaves of weeds on May 8th. May 18th and 6th
The weed growth status on the 6th day of the month (indicated by the 5-level evaluation value as in Test Example 1.2) was as shown in Table 3.

The 3% sodium cyanate solution was highly effective against broad-leaved weeds, but
The effect was small on grassy weeds, and regeneration of weeds that had once died was observed.

TEPP acid, DCPP acid, and TNDE have extremely weak effects on broad-leaved weeds, and although they have a control effect of 80 to 100% on grass weeds, it takes 10 to 15 days for the effects to appear.

DCCA alone had insufficient control power.

#3 Oat 2-2.5 1.5 8 luc haze 4.5-5 5 1 Sodium cyanate 3% Fleas 77 sma 5
5:, P' Creak 3.5-5 5-day mogi
44.5 Oat 04 2 TNDE O, 05% Harunon
OO Gishiishi OO Yomo* 00 Oat 3.5-4.5 5 Nang Soda 3% Harutz 1 N 4.5-5 53
+ Himenofuon 4,5-
5 5TNDE Q, 05% Flea 77 Sma 55 Platypus 4.55 Sparrow lily 55 Oat 05 4 DCPP acid sodium 0.05% Hymenosin
GO Miminagusa 00 Sodium cyanate 3% Kounnozuri 3.
5-4.5 55+ / Minofusuma 55DCPPIillung 0.05% Hully, N 55ノYshi 55 Oat 05 6 DCPPCPP outside 0.05% Bulge, N
00nomino7suma OO Nogeshi 00-1+19- Oat 3.55 Sodium cyanate 3%, 6 Menotebbou 557
10 Nomi 77 Sma 55D
CPP butyl o, os% Miminagusa 5-
1 5 HARZ 1%-55 IF 55 EN I 05 8 TFPPII butyl 0.05% HARZ Kasumi
00 himemurikishi! 1 Kegi OO Oat 4.5-5 Nawate 5 Sodium cyanate 3% Halcine 559 +
Miminagusa 55TFPP Shunbutyl 0.05% Gishigishi 55 Tsumoi 54.5 Ushichickweed 55 Kamijidasa 22 Harutslayer 0215 10 DCCA O, 25% Yaemugura
02 Yomoi 1.51 Japanese pea 2.5 1.513- Sodium cyanate 3% Oat 53
．． 5.411 + Hartz 1n
55DCCA 0.25% Miminagusa 55') 5 Rito Σ--55 Oat 55cm 85cm Honharutsu 1n @Qu 85# Miminagusa
151 181 Umbakobe 20#
20a Jimogi 65#67〃 12J1 treatment ゝ Nodeshi ”
454 46# Oras/Ento 70 skewers 72
# Platypus 60 # 62 # Sparrow 20 # 22 # Gishiishi 4
0# 80# Hymenon 60# 8
3*Note: In the present invention plots (3, 5, 7, 9, and 11), the herbicidal effect appeared quickly, and excellent efficacy was observed from about 5 to 7 days after application, and the herbicidal effect was still visible even after one month. All weeds were almost completely suppressed.

Test Example 4 Test plots of 1 plot and 2 x 2 plots were set up at the edge of overgrown weeds in the field, and a spray solution was prepared by diluting the test drug 14- with 101/a water and spraying was carried out. The treatment was carried out on May 8th, and the investigation was carried out on May 20th [LJ] and June 20th [LJ]. The survey results are shown in the table below.

Table 4 Kamojigusa 20 1 Sodium cyanate 3% Himen +
l:s a, s--11----------Muqt-1111124.5-12=-Kamosigusa
3.5-4 5 Shimogi 00 2 TFPPII Butyl o, 05% q Shimogi 0.
0 Mehishiba 45 Yapurashi 0 0 --- Sodium cyanate 3% Kamojigusa 553 +
Red cucumber glue 55TFPP Shunbutyl 0.05% Horsetail 54.5 Ishigishi 4.5 (-= Sodium cyanate 3% showed a relatively weak unveiling effect 12 days after treatment, but significant regeneration after 32 days) was seen.

Butyl TFPP acid 0.05% group showed an effect only on grass weeds, and the activity was moderate 12 days after treatment. On the other hand, the mixed-use area showed a large unveiling effect both after 12 and 32 days, indicating an excellent effect that was both immediate and long-lasting.

Formulation example 1゜(1) Butyl TFPP acid 2.5 parts by weight (2) Kaolin 17.
5 parts by weight (3) Sodium alkylbenzenesulfonate
5 ff1iLl (4) Sodium cyanate
75 parts by weight (1), (2) and V (3)
Mix uniformly, further add (4), mix and grind,
The composition of the present invention (hydrating powder) was prepared.

Formulation example 2゜(1) DCPP soda 3 parts by weight (2) Sodium cyanate 90
Part by weight (3) Sodium alkylbenzenesulfonate
A composition of the present invention (aqueous solvent) was prepared by uniformly mixing 1 g of 7 weight (1), (2), and (3).

Formulation example 3゜(1) TNDE 5 parts by weight (2) Sodium cyanate 70
Weight part (3) Soda carbonate 2
0 parts by weight (4) Labelin S (trade name: formalin composite of sodium naphthalene sulfonate) 5 heavy fit parts (1) are heated and melted to a liquid state, and (2) is heated to about 70°C and stirred. I sprayed it while doing so. After cooling (3) and (4)
) and pulverized and mixed to obtain a composition (powder) of the present invention.

Patent applicant: Ishihara Sangyo Co., Ltd. Japan Fine Chemical Co., Ltd. 117 completed-

Claims (1)

[Claims] a-(4-(5-)lifluoromethyl-2-pyridyloxy)phenoxy]propionic acid salts and esters,
Salts and esters of l[4-(3,5-dichloro-2-pyridyloxy)phenoxy]ppionic acid, 2-chloro-4-trifluoromethyl-4'-nitroSj phenyl ether and N-(3 ,4-dichlorophenyl)
A herbicidal composition comprising at least one selected from the group of cyclopropanecarboxamides and an alkali cyanate as active ingredients.