JPS6247161B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fungicidal composition that effectively controls overwintering diseases of trees. The control of various diseases on trees can be broadly divided into the control of overwintering disease bacteria that hide under the skin of tree trunks and branches during the tree's hibernation period, and the control of disease bacteria during the growing season after the tree has germinated and expanded its leaves. Conventionally, various fungicides have been put into practical use to control diseases during the growing season after germination and leaf spread of trees, but the fungicides that can be used during the overwintering season of trees are extremely limited. For example, there are only lime sulfur mixtures, pentachlorophenol, and organic chemical agents (such as methyl dimethyldithiocarbamate). This is largely due to the fact that many of the overwintering pathogens often penetrate deep into the bark layer, making it difficult for ordinary chemicals to penetrate. The present inventors have determined that 3,5-dimethyltetrahydro-
It was revealed that 2H-1,3,5-thiadiazine-2-thione (hereinafter referred to as TMTT) can extremely effectively control various disease fungi during the hibernation period of trees, especially against overwintering disease fungi. By using a mixture of one or two types of seed adjuvants,
By revealing higher pesticidal effects,
The invention has been completed. TMTT according to the present invention is conventionally known as a soil disinfectant, and this agent is effective against overwintering diseases of trees.
It is an unexpected fact that hibernating trees can be extremely effectively controlled without causing chemical damage, and it is thought that the value of use in industrial and horticultural fields is extremely high. Examples of overwintering pathogens that can be effectively controlled by this agent during the hibernation period of trees include grape late rot (Glomerella cingulata), citrus black spot (Diaporthe citri), grape black pox (Elsinoe ampelina), Examples include Gloeosporium Kaki, Cladosporium carpophilum, and the like, but the diseases targeted by the composition of the present invention are not limited thereto. The fungicidal composition of the present invention can be used by applying or spraying the agent at a predetermined concentration onto tree trunks and branches. As described in the examples, the auxiliary agent that enhances the effect is one that is added or mixed in advance with TMTT and fixes or covers the TMTT to further enhance the effect. Various things contributed to enhancing the effect depending on the type. That is, paraffin, vinyl acetate, polyoxyethylene resin acid, polyoxyethylene alkyl ether,
Polymer emulsion such as synthetic resin, or vegetable oil,
The efficacy could be enhanced by adding one or more of polyvinyl alcohol, alginic acid, gelatin, sodium carboxymethyl cellulose (CMC), etc. That is, when this drug is actually manufactured and used, it can be prepared and used in the usual dosage form currently commonly used as concentrated medicines, as described in the Examples. In addition, when using an adjuvant added to the above-mentioned ordinary preparation, it can be easily prepared by adding it at the time of use, and as shown in the examples, some adjuvants may be mixed with TMTT in advance. It is also possible to make and use . It was completely unexpected and completely unknown that such a preparation and method of use would exhibit excellent effects against various wintering diseases and exhibit excellent practicality. This pest control agent and its method of use not only significantly simplify and save labor for pest control work, but also make it possible to alternately use compounds with completely different effects from conventional pest control agents, along with its excellent pest control effect. This makes it extremely useful in taking measures against resistant bacteria. Next, Examples will be described to explain the details of the present invention, but it goes without saying that the blending ratios of each may be varied over a wide range other than those shown below. Example 1 Aqueous solution 20 parts by weight of TMTT (98%), caustic soda (95%)
%) 11 parts by weight and 69 parts by weight of water were mixed and dissolved to obtain an aqueous solution. When using, dilute with water and apply with a brush. Example 2 Emulsion 10 parts by weight of TMTT was mixed with 44 parts by weight of N.N-ditylformamide (hereinafter referred to as DMF) and xylene.
The mixture was dissolved in 40 parts by weight, 6 parts by weight of an emulsifier was added thereto, and mixed and stirred to obtain an emulsion. This produces a good emulsion when diluted with water. Apply this dilution to the affected area by spraying or brushing. Example 3 Oil: 5 parts by weight of TMTT, 20 parts by weight of DFM and 55 parts by weight of xylene
Parts by weight were dissolved in 20 parts by weight of linseed oil to obtain an oil solution. This may be directly sprayed using a sprayer or applied with a brush. Example 4 Wettable powder A wettable powder was obtained by mixing and pulverizing 40 parts by weight of TMTT, 40 parts by weight of clay, 10 parts by weight of bentonite, and 10 parts by weight of a dispersant. It is diluted and suspended in water and then sprayed or applied. Example 5 Powder 1 part by weight of a dispersant and 2 parts by weight of sodium carboxymethyl cellulose (CMC) were added to 4 parts by weight of TMTT, 89 parts by weight of talc, and 4 parts by weight of gelatin powder, and the mixture was mixed and ground to obtain a powder. Add water to this and mix well to form a paste and apply it to the affected area. Example 6 Aerosol agent 3 parts by weight of TMTT, 34 parts by weight of DMF, 33 parts by weight of xylol
10 parts by weight of pigment, 20 parts by weight of propellant
Parts by weight were added and filled to obtain an aerosol agent. Spray this aerosol onto the affected area. Example 7 Paste 50 parts by weight of boiling oil, 40 parts by weight of pigment, and 5 parts by weight of dispersant were mixed with 5 parts by weight of TMTT, and a sufficiently uniform paste was obtained using a homogenizer. Apply this paste directly to the affected area. Next, the characteristics and control effects of the composition for controlling overwintering diseases of the present invention and the control method using the same will be explained with reference to test examples. Test Example 1 Effect of TMTT emulsion with the addition of a fixing agent on grape late rot disease (Glomerella cingulata). Test method: Field test, 10% TMTT emulsion was used as the test agent, and 40% paraffin was used as the adhesive spreading agent.
Emulsion was added. As a control agent, Neoasozin solution (preparation containing 6.5% iron ammonium metalarsonate as an active ingredient, manufactured by Kumiai Chemical Industry Co., Ltd.), which is commonly used as a pest control agent, was used. On April 23rd, the test chemicals were diluted with paraffin emulsion stock solution to the specified concentration and applied to all the mother branches of each area using a brush. The survey was conducted on August 11th. The degree of disease was divided into five levels as follows, and the number of whole fruit bunches was investigated for each degree. No degree of disease Diseased grains out of whole grains in one fruit cluster 0% Small Among all: Less than 5% Medium Among: 6-20% High Among 〃 21-50% Very Among 〃 51% or more

[Table] TMTT emulsion with 40% paraffin emulsion
The late-rot control agents diluted 10 and 30 times were much higher than conventional control agents, showing surprising efficacy. Test example 2 Pre-emergence spraying effect on plum scab disease Shirakaga 6th grade, 1 ward, 1 tree, 3 consecutive times, 4 times every 10 days from February 2nd to March 5th, June 3rd, 1 tree The number of affected fruits per 200 fruits was investigated.

[Table] Test example 3 Effect of pre-emergence spraying on rose scab, Confidence 5th grade, 1 ward, 1 tree, 3 consecutive times in February
Spraying was carried out twice on March 12th and March 1st, and on July 15th, three flowering branches per tree were arbitrarily sampled and the number of affected leaves of each was investigated.

【table】

【table】

Claims (1)

[Claims] 1 3,5-dimethyltetrahydro-2H-1.
A fungicidal composition containing 3,5-thiadiazine-2-thione as an active ingredient for effectively controlling overwintering fungi of trees. 2 3,5-dimethyltetrahydro-2H-1.
The sterilizing composition according to claim 1, comprising 3,5-thiadiazine-2-thione and paraffin emulsion. 3 3,5-dimethyltetrahydro-2H-1.
A sterilizing composition according to claim 1, comprising 3,5-thiadiazine-2-thione and a vegetable oil emulsion. 4 3,5-dimethyltetrahydro-2H-1.
The sterilizing composition according to claim 1, comprising 3,5-thiadiazine-2-thione and a polymer emulsion.