JPS5823363B2 - Fungicide for agriculture and horticulture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides calcium cyanamide or cyanamide and
-Hydroxy-5-methylisoxazole (hereinafter referred to as hydroxyinxazole) as an active ingredient.

Conventionally, metal compounds such as organic mercury agents have been mainly used as fungicides for agriculture and horticulture, and their excellent bactericidal effects are well known.

However, in practice, these compounds have a phytotoxic effect on plants, and in recent years, the use of drugs with strong toxicity and residual toxicity has been restricted, and there are currently no safe and appropriate control effects that can replace these metal compounds. The current situation is that the development of new drugs that have this ability is actively underway.

In view of these current circumstances, the present inventors have conducted various studies to develop an inexpensive pest control agent that has strong bactericidal activity, is free from chemical damage, has no water storage toxicity, and has no residual toxicity.As a result, the agricultural and horticultural disinfectant according to the present invention has been developed. It has been found that the agent has a strong bactericidal effect against plant pathogens such as Sclerotinia fungi and Seedling damping-off fungi, and has almost no phytotoxic effects on plants.

Calcium cyanamide or cyanamide is known as a substance that has bactericidal, insecticidal, and herbicidal effects and has a wide range of applications.

Hydroxyinxazole is also known to be used as a fungicide.

However, in the past, calcium cyanamide was mainly used for its fertilizer effect as lime nitrogen, and its pest and disease effects were only recognized as a secondary effect.

In addition, lime nitrogen is leached with water and the supernatant liquid (cyanamide)
There is also a method of using it for the purpose of controlling pests and diseases.

However, in the former case, the effect of controlling pests and diseases is low, and in the latter case, it is complicated to work for the user, and the pest control effect is even worse than that of calcium cyanamide.

Furthermore, hydroxyisoxazole has to be used in large quantities in order to fully exhibit its bactericidal effect, which is disadvantageous in terms of price.

However, as in the present invention, an excellent synergistic effect can be obtained by using calcium cyanamide or cyanamide in combination with hydroxyisoxazole.

Therefore, the drug according to the present invention is extremely excellent as a fungicide for rapeseeds, rice, etc., and has particularly excellent bactericidal effects against cucumber seedling blight and common bean sclerotium.

Furthermore, the drug according to the present invention also has insecticidal, herbicidal, and growth promoting effects, making it extremely useful as a drug with a wide range of applications.

In the drug according to the present invention, the amount of hydroxyisoxazole used is usually 1/10 to 1/200 part by weight of calcium cyanamide or cyanamide, but the amount can be increased or decreased as appropriate depending on the purpose of use.

The agricultural and horticultural fungicide of the present invention can be used in its original form, but it can also be used in dosage forms commonly used as agricultural and horticultural fungicides, such as straw powder, liquid, emulsion, granule, and fine granules. It can be used as a drug and other commonly used forms of medicine.

The carrier used in the agricultural and horticultural fungicide of the present invention may be either solid or liquid, and is not limited to a specific carrier.

Examples of solid carriers include various clays, kaolin, clay, diatomaceous earth, curcum, silica, and calcium oxides, and examples of liquid carriers include those that serve as a solvent for the active ingredient compound of the present invention and those that are non-solvents. Any auxiliary agent may be used as long as it can easily disperse or dissolve the active ingredient compound of the present invention.

In addition, the agricultural and horticultural fungicide according to the present invention can be used as a simultaneous control agent in combination with insecticides, herbicides, other fungicides, plant growth regulators, fertilizers, etc. in order to save labor in agriculture. It is also possible to exhibit effects such as weeding, plant growth regulation, etc., and it is also possible to expand the scope of application as a fungicide.

EXAMPLES Next, Examples will be given to further specifically explain the present invention, but the present invention is not limited to the following Examples.

In the examples, "parts" indicate "parts by weight."

Example 1 A powder was prepared by uniformly mixing 96 parts of calcium cyanamide (lime nitrogen) powder with a particle size of 95% under a 32 mesh sieve and 4 parts of hydroxyisoxazole powder using a mixer.

Example 2 98 parts of the calcium cyanamide powder used in Example 1 and 2 parts of the hydroxyisoxazole powder were uniformly mixed in a mixer to prepare a powder.

Example 3 50.5 parts of calcium cyanamide powder, 1 part of hydroxyisoxazole powder, and 30.5 parts of heavy sintered phosphorus used in Example 1
1 part and 18 parts of potassium chloride were uniformly mixed in a mixer to prepare a powder.

Example 4 A liquid preparation was prepared by adding 2 parts of hydroxyinxazole powder to 98 parts of cyanamide solution (50% concentration) and thoroughly stirring and mixing.

Reference Example 1 Calcium cyanamide (lime nitrogen) was pulverized to prepare a powder having a particle size of 95% under a 32 mesh sieve.

Reference example 2 A cyanamide solution with a concentration of 50% was prepared.

Reference Example 3 A powder was prepared by uniformly mixing 4 parts of hydroxyinxazole powder and 96 parts of clay using a mixer.

Reference example 4 50.5 parts of ammonium sulfate, 30.5 parts of heavy calcined phosphorus, and 18 parts of potassium chloride
A powder was prepared by uniformly mixing the two parts with a mixer (N, P
, the ingredients are the same as in Example 3).

Test Example 1 Cucumber seedling damping-off control effect test Pots with a diameter of 16 cm were filled with field soil according to the general field cultivation test method.

At the time of filling, the samples prepared in each Example and Reference Example were uniformly mixed with soil, and the seedling damping-off fungus (Fusarim oxysporum) was further cultured on bran at 28°C for 2 weeks.
) was also mixed well with the soil at the same time in each pot.

Each pot was kept in a greenhouse at a temperature of 23°C during the day and 158°C at night, but on the 8th day after filling with soil, cucumbers (variety: Setsunari Kaga) were grown.
Thirty seeds each were sown, and on the 16th day, the disease state of seedling damping off was investigated.

The healthy seedling rate was calculated using the following formula.

Next, the test results are shown in Table 1.

In addition, the description in the section of the test drug in the table is indicated by the example or reference side number in which the drug was prepared.

As is clear from Table 1 above, the compounded acid product according to the present invention exhibits superior pesticidal effects compared to the control agent.

Test Example 2 Kidney bean sclerotium disease control test A pot with a diameter of 16 GIrL was filled with field soil according to the general field cultivation test method.

At the time of filling, each pot was prepared in which the samples prepared in each Example and each Reference Example were uniformly mixed with soil.

Each pot was maintained in a glass-enclosed greenhouse at a temperature of 23°C during the day and 14°C at night. On the 8th day of filling with soil, 20 green beans (variety: Kintoki) were sown, and the seedlings in the latter pot grew healthy and grew cotyledons. The plants were thinned out, leaving only the stocks.

When the green beans have grown to the 1.5 leaf stage, seedling seedlings (Scl)
erotinia sclero-tiorum) was inoculated onto the leaves, and the disease state was investigated 5 days later.

The investigation method was based on the ratio of the diseased area of the investigated leaves to the untreated leaves.

In addition, the description in the section of the test drug in the table is indicated by the example or reference side number in which the drug was prepared.

Next, the test results are shown in Table 2.

Test Example 3 Paddy rice seedling damping-off control test Fill a seedling box with 5kl of alluvial sandy loam soil, inoculate the soil with damping-off fungus (Fusarium sp), and after 10 days, mix the test agent uniformly into the soil. did.

111 days after mixing, paddy rice seeds (variety: Japan Time) were sown.

The environment was maintained at a glass-covered temperature, and the daytime temperature was controlled at 24°C and the nighttime temperature was controlled at 14°C, and results were investigated in the first month of sowing.

Next, the test results are shown in Table 3.

As is clear from Table 3 above, the composition according to the present invention exhibits a superior pesticidal effect compared to the control agent.

Claims (1)

[Claims] 1. An agricultural and horticultural fungicide characterized by containing calcium cyanamide or cyanamide and 3-hydroxy-5-methylisoxazole as active ingredients.