An environmentally friendly agent for preventing and controlling macadamia nut borer

Abstract

The present invention belongs to the technical field of pesticides, and specifically relates to an environmentally friendly agent for controlling macadamia nut peach borer. The environmentally friendly insecticide composition comprises an active ingredient comprising a binary combination of oxymatrine and spinosad, chlorfenapyr, or tolfenpyrad. The environmentally friendly agent exhibits high control efficacy: when oxymatrine is combined with spinosad, chlorfenapyr, or tolfenpyrad within a certain mass ratio range, it exhibits a synergistic effect against macadamia nut peach borer, thereby enhancing control effectiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and particularly relates to an environmentally friendly agent for preventing and controlling macadamia nut borer. Background Art

[0002] The peach borer (Conogethes punctiferalis Guenée), also known as the peach borer, peach spot borer, and peach borer, is a omnivorous pest of the family Pyralidae in the order Lepidoptera. It can damage a variety of fruit trees, forest trees, and crops, including macadamia nuts. When the larvae of the peach borer infect macadamia nuts, they primarily infest the nut shells. Some larvae also penetrate the young nut shells and seed coats to enter the kernels. When infested fruits are dissected, larvae can be seen between the shell and seed coat. Infested fruit typically cracks or breaks the peel, dries out, interrupts fruit development, and causes premature fruit drop, impacting macadamia yield and quality.

[0003] Chemical pesticides are a common method for controlling agricultural pests, and are certainly an effective means of controlling the macadamia peach borer. However, long-term application of a single chemical can lead to pest resistance, reducing the effectiveness of chemical control. Fruit farmers often increase the dosage or frequency of chemical applications to improve pest control. However, this only improves control effectiveness in the short term and can exacerbate the development of pest resistance, pesticide residues, and environmental pollution.

[0004] Oxymatrine, also known as matrine, CAS number: 16837-52-8, molecular formula: C 15 H 24 N2O2, the structural formula is as follows:

[0005]

[0006] Oxymatrine is a natural plant ingredient with low toxicity to humans and animals, and has a wide spectrum of insecticidal activity. It has contact and stomach poisoning effects on pests, and has obvious control effects on various crop pests such as armyworms, cabbage worms, aphids and red spiders. The prior art discloses that oxymatrine has a high synergistic effect when compounded with neonicotinoid insecticides such as imidacloprid, acetamiprid, nitenpyram, thiamethoxam, thiacloprid, dinotefuran or clothianidin, which can reduce and delay the development of drug resistance in pests and can be used to control various pests on rice, vegetables and fruit trees. Secondly, the prior art also discloses that oxymatrine can be used to control pests such as beet armyworm, rice leaf roller, cotton bollworm, diamondback moth, cabbage worm, Spodoptera litura and red spider when compounded with benzoylurea such as hexaflumuron, flufenoxuron, lufenuron, flufenoxuron, diflubenzuron, diflubenzuron or thiophanate-methyl.

[0007] At present, there are no reports on the combination of oxymatrine with spinosad, chlorfenapyr or tolfenpyrad.

[0008] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0009] The present invention aims to provide an environmentally friendly agent for controlling macadamia nut borer, which has high control effect, low resistance risk, and is green and safe.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] An environmentally friendly insecticidal composition, wherein the effective ingredients of the environmentally friendly insecticidal composition are formed by a binary combination of oxymatrine and spinosad, chlorfenapyr or tolfenpyrad.

[0012] Preferably, the mass ratio of oxymatrine to spinosad is 1-15:45-1.

[0013] Preferably, the mass ratio of oxymatrine to chlorfenapyr is 1-20:30-1.

[0014] Preferably, the mass ratio of oxymatrine to tolfenpyrad is 1-40:40-1.

[0015] The present invention also provides an environmentally friendly agent, which is prepared from the environmentally friendly insecticide composition and auxiliary components.

[0016] The present invention also provides use of the environmentally friendly insecticide composition or the environmentally friendly agent in preventing and controlling agricultural pests.

[0017] Preferably, the agricultural pests include macadamia nut borer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) High control effect. When the oxymatrine of the present invention is compounded with spinosad, chlorfenapyr or tolfenpyrad, within a certain mass ratio range, it exhibits a synergistic effect on macadamia nut borer, thereby improving the control effect.

[0020] (2) Low resistance risk. The environmentally friendly agent of the present invention is compounded with two insecticide active ingredients in a certain mass ratio. It can control pests from different sites of action, has a low resistance risk, and can delay the development and development of pest resistance.

[0021] (3) Green and safe. The environmentally friendly pesticide of the present invention has high control efficiency and can reduce the amount of pesticide used. On this basis, it can reduce the cost of prevention and control, the amount of pesticide residue and the environmental pressure. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0023] Example

[0024] 1. Test agent

[0025] 98% oxymatrine technical, 81.2% spinosad technical, 92% chlorfenapyr technical, 98% tolfenpyrad technical, all of the above agents are commercially available.

[0026] After dissolving the test agent, dilute it with 0.1% Tween-80 aqueous solution to 800 mg / L single-dose stock solution. Set up multiple groups of ratios, and set 5 mass concentration gradients for each single-dose stock solution and each group of ratio mixtures, each with a mass concentration of 50 mL.

[0027] 2. Test pests

[0028] Peach borer (C. persica) was collected from macadamia nuts and reared in the laboratory for more than five generations. Rearing conditions included a temperature of 27±1°C, a humidity of 70%, and a photoperiod of L:D = (15:9) h. Healthy, second-instar larvae of uniform size were selected as test subjects.

[0029] 3. Test methods

[0030] The test insects were immersed in the solution for 8 seconds. The excess solution was absorbed with filter paper and then transferred to the original breeding conditions for rearing. Each treatment was repeated 4 times, with 20 insects immersed in each repetition. A solution containing only 0.1% Tween-80 was set as a blank control. After 24 hours, the mortality of the test insects was checked, and the total number of insects and the number of dead insects were recorded. The corrected mortality rate of each treatment was calculated, and regression analysis was performed to calculate the LC value of each treatment agent. 50 .

[0031] The co-toxicity coefficient (CTC) of the mixture was calculated according to the Sun Yunpei method, and the synergistic effect of the mixed drugs was evaluated based on the CTC. A CTC of ≤ 80 indicates an antagonistic effect, 80 < CTC < 120 indicates an additive effect, and CTC ≥ 120 indicates a synergistic effect. The results are shown in Tables 1-3.

[0032]

[0033] In the above formula: P is the mortality rate, in %; K is the number of dead insects, in head; N is the total number of insects treated, in head.

[0034]

[0035] In the above formula: P1--corrected mortality rate, unit is %; P t --Treatment mortality, unit is %; P0--blank control mortality, unit is %.

[0036] Table 1 Indoor bioactivity of oxymatrine and spinosad combination against macadamia nut borer

[0037]

[0038]

[0039] As shown in Table 1, when oxymatrine and spinosad were compounded in a mass ratio of 1-15:45-1, the co-toxicity coefficient against macadamia nut borer was greater than 120, which was a synergistic effect.

[0040] Table 2 Indoor bioactivity of oxymatrine and chlorfenapyr against macadamia nut borer

[0041] Drug name and ratio <![CDATA[LC 50 (mg / L)]]> ATI TTI CTC Oxymatrine 1.7486 100.0000 -- -- Chlorfenapyr 13.7073 12.7567 -- -- Oxymatrine 1: Chlorfenapyr 30 8.6928 20.1155 15.5710 129.1856 Oxymatrine 1: Cyclofenac 20 6.0108 29.0910 16.9111 172.0224 Oxymatrine 1: Chlorofenazine 10 5.4990 31.7985 20.6879 153.7057 Oxymatrine 1: Cyclofenac 5 3.3006 52.9782 27.2973 194.0790 Oxymatrine 1: Cyclofenac 1 2.4052 72.7008 56.3784 128.9516 Oxymatrine 5: Cyclofenac 1 0.9705 180.1752 85.4595 210.8312 Oxymatrine 10: Chlorofenazine 1 0.6180 282.9450 92.0688 307.3191 Oxymatrine 20: Chlorfenapyr 1 1.3556 128.9909 95.8456 134.5820

[0042] As shown in Table 2, when oxymatrine and chlorfenapyr were compounded in a mass ratio of 1-20:30-1, the co-toxicity coefficient against macadamia nut borer was greater than 120, which was a synergistic effect.

[0043] Table 3 Indoor bioactivity of oxymatrine and tolfenpyrad against macadamia nut borer

[0044]

[0045]

[0046] As shown in Table 3, when oxymatrine and tolfenpyrad were compounded in a mass ratio of 1-40:40-1, the co-toxicity coefficient against macadamia nut borer was greater than 120, which was a synergistic effect.

[0047] In summary, when oxymatrine of the present invention is binary-combined with spinosad, chlorfenapyr or tolfenpyrad, the co-toxicity coefficient against macadamia nut peach borer is greater than 120 within a certain mass ratio, showing a synergistic effect. Compared with a single active ingredient, the control effect against macadamia nut peach borer can be improved, which is beneficial to reducing the application dosage and delaying the development of pest resistance.

[0048] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An application of an environmentally friendly insecticide composition in controlling macadamia nut borer, characterized in that: The environmentally friendly insecticide composition is composed of a binary compound of oxymatrine and spinosad; wherein, The mass ratio of oxymatrine to spinosad is 1-15:45-1.

2. An environmentally friendly agent, characterized in that: The environmentally friendly insecticide composition is prepared from the environmentally friendly insecticide composition according to claim 1 and auxiliary components.

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