CN108684661A - A kind of suspending agent of prevention rice disease - Google Patents

Abstract

The invention discloses a kind of suspending agent of prevention rice disease, the percentage composition of active ingredient prochloraz nantokite is 22.5% in the suspending agent, the percentage composition of active ingredient tricyclazole is 22.5%.The test of pesticide effectiveness shows that the suspending agent has the positive features such as with strong complementarity, synergistic effect is apparent, prevention spectrum expansion, amount of application is reduced, the optimum period for applying fertilizer extends, high, environmental pollution reduces to crop safety and environment compatibility is strong.

Description

A kind of suspending agent for preventing and treating rice diseases

technical field

The invention belongs to the field of agricultural plant protection, and in particular relates to a suspending agent with remarkable effect on rice disease control.

Background technique

Rice blast is one of the important diseases of rice, which can cause a large reduction in yield, and in severe cases, the yield can be reduced by 40% to 50%, and even the grains cannot be harvested. Occurs evenly in all rice regions of the world. The disease occurs everywhere, most of which occur in the leaves and nodes, and can cause different degrees of yield reduction after the occurrence, especially the early and severe occurrence of panicle blast or knot blast, which can cause white ears and even yield. In recent years, the annual occurrence area of rice blast in Guangdong is not less than 500,000 mu, and it has been increasing year by year. Local outbreaks are not uncommon. At present, rice blast may occur in any year and any season in the province.

Rice sheath blight, also known as moire, is commonly known as flower foot stalk, rotten foot blast, eyebrow spot. It is caused by infection by Rhizoctonia solani, and it mostly occurs under high temperature and high humidity conditions. Sheath blight is one of the major diseases in rice production, which is a serious hazard in southern rice areas. The disease prevents the rice from heading, or there are more grains in the heading, and the grain weight decreases.

Rice false smut is a fungal disease that occurs in the late stage of rice. It has commonly occurred in various rice areas in China in recent years, and has become one of the main diseases of rice. Rice false smut only occurs in the panicle after rice flowering to milk maturity, and is mainly distributed in the middle and lower part of the rice panicle. Rice false smut can reduce the thousand-grain weight of rice, decrease the yield, increase the grain and broken rice, and reduce the yield and quality of rice. This germ contains toxic substances and pathogenic pigments for humans, livestock, and poultry, which can cause direct and indirect damage to humans.

Prochloraz copper salt is a complex of fungicide prochloraz. Prochloraz copper salt has multiple functions such as systemic absorption, conduction, prevention, protection, and treatment. It belongs to imidazole fungicides. The copper complex is an active ingredient, which has special effects on various crop diseases caused by ascomycetes. Prochloraz copper salt works by inhibiting sterol biosynthesis. It is mainly used for crops that are prone to phytotoxicity when prochloraz EC is used. It has obvious control effects on diseases caused by Ascomycetes and Deuteromycetes in various crops. It can also be used with most fungicides, fungicides, insecticides, Mixed use of herbicides has good control effect. It can treat and eradicate various diseases on field crops, fruits and vegetables, turf and ornamental plants.

Tricyclazole is a special fungicide for the control of rice blast and belongs to the thiazole class. The bactericidal mechanism is mainly to inhibit the formation of episporium melanin, thereby inhibiting spore germination and episporium formation, preventing the invasion of pathogens and reducing the production of spores of Magnaporthe grisea. Tricyclazole has a strong systemic property and can be quickly absorbed by the roots, stems and leaves of rice and transported to all parts of the rice plant. Generally, the absorbed drug amount in the rice plant can reach saturation within 2 hours after spraying. Tricyclazole is mainly used for prevention and protection, and the effect is best when used before the onset of disease. The effect of soaking seedlings with tricyclazole to prevent and control leaf blast is better than spraying before pulling out seedlings. Soaking seedlings with medicinal liquid may sometimes cause yellowing, but it will recover soon, and will not affect the growth of rice seedlings in the future.

Practical pesticide experience has shown that repeated and exclusive application of an active compound to control agricultural diseases will lead to rapid selection of target organisms in many cases. At present, a mixture of different active compounds is usually used to control diseases. By combining active compounds with different mechanisms of action, the development of resistance can be delayed, the amount of application can be reduced, and the cost of control can be reduced.

Contents of the invention

The object of the present invention is to provide an effective control pesticide for rice diseases.

The purpose of the present invention can be achieved through the following measures:

The object of the present invention is to provide a kind of suspending agent for preventing and treating rice diseases, the active ingredient of this suspending agent is made up of prochloraz copper salt and tricyclazole, and the weight ratio of described prochloraz copper salt and tricyclazole is 1 : 1, the total weight percentage of described active ingredient in this suspending agent is 45%, and all the other are auxiliary agents. Wherein: the weight percentage of prochloraz copper salt is 22.5%, and the weight percentage of tricyclazole is 22.5%. According to the occurrence degree of rice diseases, the dosage of the active ingredients of the present invention is 180-456 g/hectare, and the frequency of application is 1-3 times.

The inventors have found through experiments that the above-mentioned suspending agent has obvious synergies, can increase the active utilization rate of the respective components, and more importantly, can significantly reduce the decomposition rate of the two active components and prolong the duration of action. Containing prochloraz copper salt and tricyclazole have different structural types and different mechanisms of action. The combination of the two can expand the control spectrum, and can delay the occurrence and development of resistance to a certain extent, and prochloraz copper salt There is no cross-resistance with tricyclazole.

In a processing scheme of a suspension agent, after uniformly mixing prochloraz copper salt, tricyclazole, dispersant, wetting agent, antifreeze agent, defoamer and water, adding it to a sander for sanding, adding pH The regulator adjusts the pH value to form the suspending agent.

The specific preparation process can choose the following methods:

Prepare this suspension. It specifically includes the following steps: firstly, mix and stir prochloraz copper salt, tricyclazole, dispersant, wetting agent, antifreeze agent, defoamer and water evenly in proportion, and add them into a sander for sand grinding until the particle size of the sample is determined to reach Requirements, release materials. Add the required structure regulator into another container, and mix it under uniform stirring to obtain a uniform material. And measure the pH value, adjust it to the required range with acid or alkali, and obtain the suspending agent.

The auxiliary agent in the suspension dosage form of the present invention includes one or more of the following auxiliary agents: wetting agent, dispersant, filler, stabilizer, solvent and auxiliary auxiliary agent, but the auxiliary agent in the present invention is not limited to All of the above, if necessary, other types of additives, such as binders, viscosity modifiers, etc., can also be added.

Suitable solvents are preferably one of methyl ester soybean oil, corn methyl ester oil, methyl ester palm oil, methyl ester coconut oil, turpentine-based vegetable oil and fatty acid ester, or toluene, acetone, isopropanol, chloroform, ethanol, methanol , cyclohexane or any combination of two or more. Most preferred are methyl ester soybean oil, methyl ester palm oil, turpentine based vegetable oil.

The suitable stabilizer is preferably one of epoxidized soybean oil, 2,6-di-tert-butyl-p-cresol (BHT), butylhydroxyanisole (BHA), triphenyl phosphite and potassium dihydrogen phosphate.

Suitable dispersants are preferably aromatic sulfonates, acrylic acid-acrylate copolymers, formaldehyde condensate sulfonates, maleic anhydride copolymer sodium salts, polymeric carboxylic acid sodium salts, styrene alkyl polyoxyethylene ether phosphates , sodium naphthalene sulfonate formaldehyde condensate, tristyrylphenol polyoxyethylene ethers and derivatives esters, fatty alcohol polyoxyethylene ethers, alkylphenol polyoxyethylene ethers, polymer EO-PO block copolymerization Lignosulfonate, alkylphenol polyoxyethylene formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate phosphate, styrene phenol formaldehyde resin polyoxyethylene ether phosphate, styrene One or more combinations of phenolic polyoxyethylene polyoxypropylene ether, alkylnaphthalene formaldehyde condensate sulfonate, polymer hydrophobic branched copolymer, and polymeric carboxylate.

Suitable fillers are selected from modified water-soluble starch, cellulose ether and its derivatives, magnesium aluminum silicate, kaolin, diatomaceous earth, attapulgite, glucose, light calcium carbonate, white carbon black, and inorganic salts. kind.

Suitable wetting agents are preferably sodium lauryl sulfate, nonylphenol polyoxyethylene, alkylphenol polyoxyethylene formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate phosphate, styrene phenol Formaldehyde resin polyoxyethylene ether phosphate, styrylphenol polyoxyethylene polyoxypropylene ether, alkylnaphthalene formaldehyde condensate sulfonate, alkyl succinate sulfonate, Span SPAN, soil temperature TWEEN One or a combination of two or more.

Suitable auxiliary agents are selected from one or more combinations of binders, disintegrants, pH regulators, bactericidal preservatives, defoamers, antifreeze agents, and thickeners; wherein: the bonding The agent is selected from polyvinyl alcohol, gelatin, gum arabic, xanthan gum, sodium polyacrylate, sodium alginate, starch, cellulose and its derivatives, preferably one of cellulose and its cellulose derivatives; the disintegrant is selected from One of magnesium aluminum silicate, polyethylene glycol PEG, modified starch, inorganic salt, white carbon black, silica gel; the pH acid-base regulator is glacial acetic acid, hydrochloric acid, ammonia, ethanolamine, triethanolamine A kind; Described bactericidal preservative is: one in potassium sorbate, sodium benzoate, formaldehyde, isothiazolinones; Described defoamer: natural oil, polyether defoamer, higher carbon alcohol, A kind of silicone defoamer. The antifreeze agent is selected from propylene glycol or ethylene glycol; the thickener is selected from xanthan gum, carrageenan, pectin, agar, alginate or sodium carboxymethyl cellulose.

The other features of the suspending agent bactericidal composition of the present invention are mainly as follows: 1. Since the chemical structures of the two single agents of the composition are very different, the mechanism of action is completely different, and the synergistic effect between the two is obvious. There is no cross resistance, which can delay the resistance problem caused by the separate use of two single agents; 2. Since the formulation of this composition is a suspension, there is no dust hazard, and it is safe for operators and the environment; water is used as the dispersion medium, There are no flammability and phytotoxicity problems caused by organic solvents; compared with wettable powders, it is allowed to choose raw materials with different particle sizes in order to achieve the best biological effect and physical stability of the preparation; liquid suspensions spread well in water , can be directly used as a spray liquid; the specific gravity is large and the packaging volume is small. The dispersion and spreadability of the suspension are relatively good, the suspension rate is high, the ability to adhere to the surface of the plant is relatively strong, and it is resistant to rain erosion, so the drug effect is more significant and longer-lasting than that of the wettable powder. It has the characteristics of small particles, large active surface, strong penetration, no dust during dispensing, low cost, and high efficacy. It also has the advantages of wettable powder and emulsifiable concentrate, can be wetted by water, and has good suspendability after being diluted with water; 3. Compared with other active ingredient forms of prochloraz, the present invention is a water-based formulation, which is more environmentally friendly. Due to the different effective forms of prochloraz, the dosage forms that can be processed are quite different. For example, prochloraz can only be processed into emulsifiable concentrates, emulsions in water and other dosage forms, and cannot be processed into suspension concentrates. The melting point of prochloraz manganese salt is low, so it can only be processed into powder dosage form, and can not be processed into suspension dosage form; 4. Inorganic copper is complexed in prochloraz copper salt, and copper ions also have good bactericidal activity, so Prochloraz copper salt has higher bactericidal activity than prochloraz or prochloraz manganese salt.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not used to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

1. Preparation of suspending agent

Embodiment 45% prochloraz copper salt · tricyclazole suspending agent

Utilize the processing method of the suspending agent of the present invention to prepare this suspending agent, the active ingredient prochloraz copper salt 22.5%, the effective ingredient tricyclazole 22.5%, dispersant styrene alkyl polyoxyethylene ether phosphate 6%, wetting agent Styrene phenol formaldehyde resin polyoxyethylene ether phosphate ester salt 8%, antifreeze agent glycerin 3%, defoamer high carbon alcohol 0.2%, thickener xanthan gum 1.5%, add water (water makes up 100%) and stir Mix, put into a sander and grind until the particle size is qualified, release the material, and adjust the pH to 5-8 with ammonia water to prepare a 45% prochloraz copper salt tricyclazole suspension.

2. Drug efficacy verification test

Utilize the suspending agent prepared by the present invention to verify the control effect in the field. Test method: In the early stage of the disease, spray the first time immediately, and decide whether to spray the second or third time according to the severity of the rice disease, and the interval between each application is 5-7 days, and each treatment is 4 plots , each plot is 20 square meters. Before the medicine and the last spraying 10-13 days, investigate and count the incidence of the disease, randomly sample at 5 points in each plot, investigate 5 crops at each point, investigate the percentage of the lesion area of each leaf on the whole plant to the leaf area and grade it, Calculate the disease index and control effect. In order to verify the actual effect, the test plots for each disease are independent test plots.

Anticipated control effect (%)=X+Y-XY/100 (wherein, X, Y are single agent control effect)

Grading standards:

Grade 0: no lesions;

Grade 1: There are less than 5 lesion spots on the leaves, and the length is less than 1cm;

Grade 3: 6-10 lesions on leaves, some of which are longer than 1cm;

Grade 5: 11-25 lesions on leaves, some lesions are connected into sheets, and the area of lesions accounts for 10-25% of the leaf area;

Level 7: There are more than 26 diseased spots on the leaves, and the diseased spots are connected into pieces, and the area of the diseased spots accounts for 26-50% of the leaf area;

Grade 9: Lesions are contiguous into sheets, and the area of diseased spots accounts for more than 50% of the leaf area, or the whole leaf is dead.

1. Field control effect test of prochloraz and its derivatives combined with tricyclazole against rice blast

Apply pesticides at the early stage of rice blast disease, and the diseases occur more seriously, mainly rice panicle blast and leaf blast, spray 3 times, and the interval between spraying is 5 days, and the amount of each spray is gradually increased, according to the amount of active ingredients The calculations were 180 g/ha, 303.75 g/ha, and 455.625 g/ha, respectively, and the control effect was measured 11 days after the third spraying.

Table 1. Field test results of prochloraz copper salt and tricyclazole compounded against rice blast

Determination result (table 1) shows that the control effect of prochloraz copper salt and tricyclazole complex pair control paddy rice blast is obviously improved, and wherein 45% prochloraz copper salt tricyclazole suspension agent control rice blast control effect and Compared with the control drug, the improvement is obvious, mainly because the prochloraz copper salt complexes inorganic copper, and copper ions also have good bactericidal activity. During the whole test process, no phytotoxicity to rice growth was found, indicating that the suspending agent of the present invention is safe to the growth of rice.

2. Field control effect test of prochloraz and its derivatives combined with tricyclazole against rice sheath blight

Apply pesticides at the early stage of rice sheath blight, apply pesticides twice, and the interval between applications is 7 days. Calculated according to the amount of active ingredients, the dosage of each application is 303.75 g/ha and 180.0 g/ha respectively. The control effect was measured 13 days after treatment.

Table 2. Field control results of prochloraz copper salt and tricyclazole compounded rice sheath blight

Determination result (table 2) shows that 45% prochloraz copper salt tricyclazole suspending agent prevents and treats rice sheath blight control effect relative control agent and has obvious promotion, illustrates that 45% prochloraz copper salt tricyclazole suspending agent controls rice Sheath blight works better.

3. Field control effect test of prochloraz and its derivatives combined with tricyclazole against rice false smut

The pesticide was applied at the early stage of rice false smut, and the pesticide was applied once. Calculated according to the amount of active ingredients, the application rate was 303.75 g/ha, and the control effect was measured 15 days after the application.

Table 3. Field test results of prochloraz and its derivatives combined with tricyclazole on rice false smut

Determination result (table 3) shows that 45% prochloraz copper salt tricyclazole suspension agent prevents and treats rice false smut control effect to have obvious improvement relative to other control agents, shows that 45% prochloraz copper salt tricyclazole suspension agent control Rice false smut is more effective.

Claims (4)

1. a suspending agent for preventing and treating rice diseases, is characterized in that, the active ingredient of this suspending agent is made up of prochloraz copper salt and tricyclazole, and the weight ratio of described prochloraz copper salt and tricyclazole is 1. : 1, the total weight percentage of described active ingredient in this suspending agent is 45%. 2. the application of the suspending agent according to claim 1 in the prevention and treatment of rice diseases. 3. The use according to claim 2, characterized in that the rice diseases are rice blast, rice sheath blight and rice false smut. 4. The use according to claim 2 or 3, characterized in that the dosage of the active ingredient of the suspension is 180-456 g/ha, and the frequency of application is 1-3 times.