JP2857188B2 - Soil nematode control agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is suitable for various plant-parasitic nematodes which infest the roots and tubers of agricultural crops and cause serious damages such as deterioration in quality and reduced yield. Although some activity is seen under the conditions,
Certain insecticides which are not practical in terms of application rate and control effect, and O, O-diethyl-O- (3-oxo-2-phenyl-2H-pyridazine- which is ineffective as a nematicide effect.
6-yl) phosphorothioate (pyridafenthione;
(Non-product name) and an excellent soil nematode control agent which is synergistically enhanced in efficacy and practically sufficiently provided.

(Prior art)

A variety of harmful nematodes inhabit the agricultural lands and forests that we use, causing tremendous damage to useful plants, crops, trees, and flowers.

In recent years, in upland agriculture in Japan, especially in vegetable areas adjacent to special production areas and large cities, it is a fact that management is not feasible unless narrow arable land is efficiently produced and stable production of high value commercial crops is carried out.

For this reason, intensive agriculture, in which the same crop is continuously cultivated for many years, has been actively carried out. As a result, nematode damage, which is said to be one of the obstacles to continuous cropping, has become an important problem. .

Important species of plant parasitic nematodes parasitic on agricultural crops are root-knot nematodes (Meloidogyne spp.), Black-spot nematodes (Pratylenchus spp.) And cyst nematodes (Heterod).
era spp.), and these parasitic plants are widespread.

For example, in the case of root-knot nematodes, cucumber, melon,
Watermelon, pumpkin, tomato, eggplant, pepper, burdock,
Parasitic range is wide from field crops such as carrots, sweet potatoes and yams to fruit trees such as apples, grapes, and figs. Damaged agricultural crops suffer quality deterioration and poor growth, and the decrease in sales is inevitable. Paramecium nematodes have parasitic damage to radish, burdock, taro, cucumber, tomato, strawberry, lettuce, fruit trees, etc., and can cause damage such as quality deterioration and root rot. .

Among soybean cyst nematodes, the soybean cyst nematodes, which specifically infest and damage the beans, often increase in population density year after year by continuous cultivation, and the yield is often drastically reduced in the third year of cultivation.

In addition, nematodes are closely related to the occurrence of soil diseases,
It is well known that soil diseases frequently occur due to the presence of plant parasitic nematodes.

At present, chlorpicrine, DD (1,
High vapor pressure drugs such as 3-dichloropropene), nemacopene (mixture of 1,3-dichloropropene and chlorpicrine) and ditrapex (mixture of 1,3-dichloropropene and methyl isothiocyanate) Fumigants are mainly used, which are instilled in soil and uniformly dispersed in the soil to control them.

Recently, nemamol (dichlorodiisopropyl ether: DCIP), bidede (methyl-N ', N'-dimethyl [(), which has a simple treatment method and does not require degassing such as fumigants, Methylcarbamoyl) oxy] -1-thiooxamidimidate; oxamyl) and advantage (2,3-dihydro-2,2-dimethyl-7)
-Benzo [b] furanyl-N-dibutylaminothio-N
Nematocides such as -methylcarbamate; carbosulfan) have also been used.

[Problems to be solved by the invention]

However, the currently used nematode control agents described above have several problems.

There are several problems with nematode control agents. For example, infusion of fumigants is complicated. A certain gas diffusion period is necessary to achieve the effect, depending on the soil temperature, it is necessary to perform operations such as soil suppression, vinyl coating, water sealing, etc. There are many problems, such as the fact that some fumigants have a strong odor and high vapor pressure, and there are air pollution problems in residential areas in suburban areas.

On the other hand, the granule type is simple to use but has an unstable effect, and has drawbacks such as higher toxicity compared to general insecticides.

Therefore, the development of a safe, simple to use, and effective soil nematode control agent is desired. The present inventors have conducted various studies to solve such problems, and as a result, the present invention has been completed. Reached.

[Means for solving the problem]

The present inventors have proposed a compound which is considered to be active in nematodes among compounds generally used as insecticides, for example, isoxathion (O, O-diethyl-O- (5
-Phenyl-3-isoxazolyl) phosphorothioate), sulphophos (O-ethyl = O-4-methylthiophenyl = S-propyl = phosphorodithioate), prothiophos (O-2,4-dichlorophenyl-O-ethyl-S-propyl) Phosphorodithioate), phenthione (O, O-dimethyl-O- [3-methyl-4- (methylthio) phenyl] thiophosphate), fenitrothion (O, O-dimethyl-O- (3-methyl-4-nitro) Phenyl) thiophosphate), salicion (2-methoxy-
4H-1,3,2-benzodioxaphosphorin-2-sulfide), thiocyclam (5-dimethylamino-1,2,3-trithiane oxalate), thiodicarb (3,7,9,13-tetra Methyl-5,11-dioxa-2,8,14-trithia-4,7,9,
Investigations have been made on whether a pesticide such as 12-tetraazapentadeca-3,12-diene-6,10-dione) can be put to practical use as a soil nematode control agent. Under conditions suitable for the application of an effect such as application of a medicinal amount and soil moisture, temperature, and contaminated soil mainly composed of larvae, although it shows a certain degree of effect, no practically applicable control agent has been found.

Therefore, a mixture of each insecticide was trial-produced, and the efficacy against nematodes was examined.As a result, a remarkable effect of enhancing efficacy was observed by applying a mixture of an off-nack having no activity to nematodes and an organic phosphorus agent or carbamate. The present inventors have found the surprising fact that the present invention can be performed and completed the present invention.

That is, the present invention relates to O, O-diethyl-0- (3-oxo-2-phenyl-2H-pyridazin-6-yl) phosphorothioate and O, O-diethyl-O- (5-phenyl-3-isoxazolyl). Phosphorothioate, O-ethyl = O-4-methylthiophenyl = S-propyl = phosphorodithioate, O-2,4-dichlorophenyl-O-
Ethyl-S-propyl phosphorodithioate, O, O-dimethyl-O- [3-methyl-4- (methylthio) phenyl] thiophosphate, O, O-dimethyl-O- (3-methyl-4-nitrophenyl ) Thiophosphate, 2-methoxy-4H-1,3,2-benzodioxaphosphorin-2-
Sulfide), 5-dimethylamino-1,2,3-trithiane oxalate, 3,7,9,13-tetramethyl-5,11-dioxa-2,8,14-trithia-4,7,9 , 12-Tetraazapentadeca-3,12-diene-6,10-dione and [RS]-[O-1
-(4-chlorophenyl) pyrazol-4-yl = O-
[Ethyl = S-propyl-phosphorothioate] as an active ingredient.

The soil nematode control agent of the present invention includes root-knot nematodes (Meloidogyne spp.), Parasitism nematodes (Pratylenchus spp.), And cyst nematodes (Heteroder)
a spp.), etc., exhibit an excellent control effect that cannot be obtained with a single insecticide. In particular, a mixture of pyridafenthion and isoxathion, salithione, thiodicarb or pyraclofos exhibits a remarkable synergistic effect, and shows a superior nematode controlling effect as compared with commonly used granular type drugs.

The mixture according to the present invention can be mixed with various carriers according to the intended use and used in any form such as dusts, fine granules and granules. Examples of the carrier include bentonite, talc, kaolin clay, diatomaceous earth, charcoal, and granular zeolite.

The active ingredient content is 1% to 10% pyridafenthion,
A range of 1% to 10% for other pesticides is suitable, the mixing ratio of which depends on the biological activity and physicochemical properties of the pesticide and is not limiting. The application rate of the active ingredient is 0.2 kg to 4 kg per 10 a, preferably 0.6 to 2 kg.
It is.

The insecticide other than pyridafenthion used in the mixture of the present invention may be only one kind, but of course, two or more kinds may be used in combination.

〔Example〕

 Next, preparation examples of the soil nematode controlling agent of the present invention will be shown.

Formulation Example 1 Bilidafentione 2 parts, Thiodicarb 75% wettable powder 2.
67 parts, 2 parts of white carbon and 93.33 parts of clay are mixed and ground to obtain a 2% + 2% mixed powder.

Formulation Example 2 Bilidafenthione 2 parts, isoxathion 50% emulsion 4
Parts, 4 parts of white carbon and 90 parts of clay,
A 2% + 2% mixed powder is obtained.

Formulation Example 3 2.5 parts of viridafention, salicion 25% emulsion 10
Parts, 8 parts of white carbon and 79.5 parts of clay are mixed and pulverized to obtain a 2.5% + 2.5% mixed powder.

Formulation Example 4 2.5 parts of bididafenthion 50% emulsion of isoxathion 5.0 Sodium dodecylbenzenesulfonate 2.0 Polyvinyl alcohol 2.0 Clay 90.5 Total 102.0 parts A total of 102.0 parts or more is mixed and powdered, and then a small amount of water is added, followed by stirring, mixing and kneading, and extrusion granulation. 2.5% + 2.5% after granulating with machine and drying
Obtain granules.

Formulation Example 5 Bilidafenthion 3.0 parts Isoxathion 50% emulsion 6.0 Acetone 1.6 Fine particle zeolite 93.2 Total 103.7 parts Bilidafenthion is acetone and isoxathion 50%
It is dissolved in an emulsion, spray-mixed with fine-particle zeolite, and dried to obtain 3% + 3% fine granules.

Formulation Example 6 Bilidafenthion 3.0 parts Salithion 3.0 β-oxy-ethylphenyl ether 4.0 Fine particle zeolite 94.0 Total 104.0 parts Bilidafenthion and salithion are dissolved in β-oxy-ethylphenyl ether, spray-mixed into fine particle zeolite, and dried. Thus, 3% + 3% fine granules are obtained.

Formulation Example 7 Bilidafenthion 3.0 parts Thiodicarb 3.0 Dichloromethane 15.0 Fine particle zeolite 94.0 Total 115.0 Parts Bilidafenthion and thiodicarb are dissolved in dichloromethane, spray-mixed into fine particle zeolite, and dried to obtain 3% + 3% fine granules.

 Next, comparative preparation examples are shown.

Comparative Preparation Example 1 8 parts by weight of methylvinphos 50% wettable powder (hereinafter referred to as "parts"), 2 parts of white carbon, and 90 parts of clay are mixed and pulverized to obtain a 4% powder.

Comparative Preparation Example 2 10 parts of a 40% emulsion of methidathion, 8 parts of white carbon,
82 parts of clay is mixed and pulverized to obtain a 4% powder.

Comparative Preparation Example 3 10 parts of isoxathion 50% emulsion, white carbon 8
And 82 parts of clay are mixed and pulverized to obtain a 5% powder.

Next, the soil nematode controlling agent of the present invention will be described with reference to test examples in order to show an excellent synergistic effect and practicality.

Test Example 1 Effect of pyridafenthion mixed powder on root-knot nematode After root-knot nematode (Meloidogyne spp.) Contaminated soil grown by continuous cultivation of tomatoes was sifted through a 5 mm sieve and mixed uniformly, 20 kg per 10 a of powder according to Preparation Example 1 was mixed.
Mix in a plastic bag with a considerable amount, φ11cm, height 8cm
After the treatment, 5 g of tomato seedlings were transplanted per cup. The test was conducted in a glass greenhouse. One month after the treatment, the tomatoes were extracted and the extent of root-knot nematode damage was investigated according to the following criteria, and the Nekob index was calculated.

For the test, 3 cups per section were used, and the results based on the total value are shown in Table 1.

As a result of this test, the mixture of pyridafenthion and another insecticide showed an excellent synergistic effect as compared with the case where each was used alone.

Damage to root-knot nematode 0: No goal 1: Several goals are recognized 2: Goals are recognized 3: Many goals are recognized 4: Goals are recognized throughout the root Test Example 2 Effect of pyridafenthion mixed powder on root-knot nematode 7 m of root-knot nematode-contaminated soil that has proliferated in tobacco
m, sieve and mix uniformly, then unglazed Pot of 17.5cm in diameter
And mixed with a predetermined amount of the powder produced according to Formulation Example 1 using a concrete mixer.

After the treatment, five lettuce seedlings were transplanted per pot and cultivated in a glass greenhouse. Approximately one month after the treatment, the lettuce seedlings were extracted, washed with water, and the Nekob index was calculated according to Test Example 1. In addition, the foliage volume was also investigated.

For the test, 3 pots were used per section, and the total results are shown in Table 2.

Test Example 3 Effect of pyridafenthion mixed dust on root-knot nematode-damaged root-contaminated soil Soil of root-knot nematode-contaminated soil grown by continuous cultivation of tomatoes was sifted through a 5 mm sieve and mixed uniformly to obtain a diameter of 11c.
500 g was placed in a polycup having a height of 8 cm and a height of 8 cm, and the root of the root-knot nematode damaged by tobacco was cut into 1 cm, and 5 g was mixed per cup.

Next, a predetermined amount of the powder produced according to Formulation Example 1 was mixed in a plastic bag. After the treatment, put in the cup again, extract the germinated cucumber seeds, wash with water, and test example 1
The Nekob index was calculated according to the following.

The test used 3 cups per section, and the results based on the total value are shown in Table 3.

Test Example 4 Efficacy comparison of isoxathion and pyridafenthion mixture by dosage form 7 m of root-knot nematode-contaminated soil that grew parasitically on tobacco
m, and the mixture was uniformly mixed. The mixture was placed in a 1 / 5000a Wagner pot, and the agents produced according to Formulation Examples 4, 5, 6, and 7 were mixed together in a concrete mixer together with an equivalent amount of 20 kg per 10a.

After treatment, 7 seeds of cucumber sprout seeds are sown per pot,
Seedlings were cultivated in a glass greenhouse. Twenty-seven days after the treatment, all the plants were taken out and washed, and the Nekob index was calculated according to Test Example 1.

Three pots were used for the test, and the results based on the total value are shown in Table 4.

Test Example 5 Comparison of Efficacy of Isoxathione and Pyridafentione Fine Granules by Component Amount A tobacco cultivation site where damage to the root-knot nematode was remarkably cultivated and leveled, and a 1 m × 3 m section was provided. Formulation Example 4 in the ward
A predetermined amount of the fine granules prepared as a prototype according to 5, 6, and 7 was hand-processed, and mixed with a rotary tiller to a depth of 10 cm.

18 days after the treatment, the soil in the ward was unglazed with 3 pieces of 17.5cm diameter Po
Then, 7 seeds of cucumber sprouting seeds were sown per pot.

Thereafter, the cucumber was cultivated in a glass greenhouse, and after 38 days, all the cucumber plants were extracted, washed with water, and the Nekob index was calculated according to Test Example 1.

 The test was repeated three times, and the average value is shown in Table 5.

Test Example 6 Effect of pyridafenthion-mixed fine granule on root-knot nematode (field) A 1 m × 3 m section was provided by cultivating and leveling the inside of a greenhouse where the root-knot nematode was significantly damaged. Formulation Example 4 in the ward
The fine granules prepared in accordance with Example 5 were hand-processed in an amount of 20 kg per 10a. After the treatment, the mixture was mixed with a rotary tiller to a depth of 15 cm. After the treatment, 15 pepper seedlings were transplanted in the plot.

Forty-one days after the treatment, the foliage length, the number of fruits, and the foliage weight of the peppers were investigated, and the Nekob index of the above-ground part was calculated according to Test Example 1.

 Table 6 shows the average value of three repetitions in one section.

Test Example 7 Effect of pyridafenthion-mixed fine granule on root-knot nematode Nematosa nematode (Prat) obtained by continuously cultivating soybean
ylenchus sp.) After mixing the contaminated soil uniformly, 1 / 5000a
The pots were placed in Wagner pots and the potato nematode before treatment (per 50 g of soil) in each pot was examined by the Berman method.
The next day, 20kg per 10a of the microgranule prototyped according to Formulation Example 5
The mixture was mixed in a concrete mixer with a considerable amount of the drug. After the treatment, 7 soybean seeds were sown per pot and cultivated in a glass greenhouse.

58 days after the treatment, the number of nematodes in 50 g of soil in the pot and 10 g of soybean root was detected and investigated by the Berman method.

In the test, three pots were used per section, and the average value
It is shown in the table.

Test Example 8 Effect of pyridafenthion-mixed fine granule on soybean cyst nematode Soybean cyst nematode (Heterodera glycines) -contaminated soil obtained by continuous cultivation of soybean was uniformly mixed to obtain a diameter of 1
The mixture was placed in a 7.5 cm unglazed pot and mixed with a concrete mixer together with a dose of 20 kg equivalent of 10 a of the fine granules prepared in accordance with Preparation Examples 4 and 5 per 10 a. After the treatment, 7 soybean seeds were sown per pot and cultivated in a glass greenhouse.

54 days after the treatment, all the plants were extracted and the number of cysts adhering to the roots was examined.

In the test, three pots were used per section, and the result of the average was
It is shown in the table.

Test Example 9 Effect of pyridafenthion mixed fine granule on root-knot nematode The root-knot nematode-contaminated soil (field soil and double-dilution soil) obtained by continuously growing tomatoes in a glass house was uniformly mixed, and placed in a 17.5 cm diameter unglazed pot. It was mixed with a concrete mixer together with a predetermined amount of the fine granules prepared as a trial according to Formulation Example 5. After the treatment, the seeds were left in a glass house, and one day after the treatment, 6 seeds of cucumber sprouting seeds were sown per pot. On the 22nd day after the chemical treatment, all the growing cucumber plants were extracted, washed with water, and the degree of root-knot nematode damage and the above-ground fresh weight were investigated.

The test used 3 pots per section, and the result of the average was ninth.
It is shown in the table.

(Effects of the Invention) The soil nematode controlling agent of the present invention shows a synergistic effect that can not be predicted by a single agent on nematodes such as root-knot nematodes, neksare nematodes, and cyst nematodes parasitic on agricultural crops, and is used safely. Can be very useful.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI (A01N 57/16 43:88) (72) Inventor Takeshi Takemita 10-7-205, Gadai, Chigasaki-shi, Kanagawa (56) Reference Document JP-A-49-118838 (JP, A) JP-A-57-167906 (JP, A) JP-A-55-53208 (JP, A) JP-A-49-126834 (JP, A) 4080 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 57/16 A01N 57/14 A01N 57/36 A01N 43/88 CA (STN) REGISTRY (STN) WPIDS (STN)

Claims (1)

(57) [Claims] (1) O, O-diethyl-O- (3-oxo-2-
Phenyl-2H-pyridazin-6-yl) phosphorothioate and O, O-diethyl-O- (5-phenyl-3-isoxazolyl) phosphorothioate, O-ethyl = O-4
-Methylthiophenyl S-propyl phosphorodithioate, O-2,4-dichlorophenyl-O-ethyl-S
-Propyl phosphorodithioate, O, O-dimethyl-O
-[3-methyl-4- (methylthio) phenyl] thiophosphate, O, O-dimethyl-O- (3-methyl-4-
Nitrophenyl) thiophosphate, 2-methoxy-4H
-1,3,2-benzodioxaphosphorin-2-sulfide), 5-dimethylamino-1,2,3-trithiane oxalate, 3,7,9,13-tetramethyl-5,11- Dioxa-2,8,
14-trithia-4,7,9,12-tetraazapentadeca-3,12
-Diene-6,10-dione and [RS]-[O-1- (4-
(Chlorophenyl) pyrazol-4-yl = O-ethyl =
S-propyl-phosphorothioate], as an active ingredient.