GB/T 17980.43-2026Pesticides - Guidelines for field efficacy trials - Part 43: Herbicides against weeds in leafy vegetables (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part

1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 43 of GB/T 17980, "Guidelines for Field Efficacy Tests of Pesticides". GB/T 17980 has published the following... part.

1.Insecticide control of lepidopteran borers in rice;

2.Insecticide Control of Rice Leaf Roller;

3.Pesticide Control of Rice Leafhoppers;

43.Herbicide Control of Weeds in Leafy Vegetable Fields;

---Part 149: Insecticides for the Control of Red Imported Fire Ants. This document replaces GB/T 17980.43-2000 "Guidelines for Field Efficacy Testing of Pesticides (I) - Control of Weeds in Leafy Vegetable Crops by Herbicides". Compared with GB/T 17980.43-2000, the main technical changes in the draft are as follows, except for structural adjustments and editorial modifications.

a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2000 edition);

b) The requirements for selecting the test weeds have been changed (see 4.2,

2.2 of the.2000 edition);

c) Added provisions for test treatment (see 5.1);

d) The requirements for test and control reagents have been changed (see 5.2,

3.1 of the.2000 edition);

e) The requirements for cell area and repetition have been changed (see 5.3.2,

1 Scope

GB/T 17980.43-2026 is the Chinese national standard covering the trial protocol for herbicides in leafy vegetables - crops harvested within weeks of treatment and eaten whole, which makes crop safety and residue the limiting considerations rather than efficacy. The GB/T 17980 series is what a pesticide registration in China rests on: it fixes the plot design and replication, the application rate and timing, the assessment of the pest and of the crop, and the analysis of the result. It replaces GB/T 17980.43-2000 and has been in force since 1 September 2026, one of the parts of the series revised together. It was issued on 27 February 2026 and has been in force since 1 September 2026, replacing GB/T 17980.43-2000. The document is under the responsibility of the Ministry of Agriculture and Rural Affairs. This page is published from the official record of the 2026 edition; the clause text of a standard this recent is not yet in circulation, and the figures, limits and tables it contains are those of the document itself, delivered in full with the English translation.

This document describes the method for field plot trials of herbicides for controlling weeds in leafy vegetable fields. This document applies to field efficacy plot trials and safety evaluations for herbicides used to control weeds in leafy vegetable fields.

4 Test conditions

4.1 Selection of Crops and Cultivars Use locally common cultivation methods and select widely planted varieties. Seed quality should meet GB 16715.2 and GB 16715.4 standards. Requirements for field-use seeds in GB 16715.5.Record the crop species (including Chinese and Latin scientific names), cultivation type, and variety name.

4.2 Selection of weeds as test subjects The weeds in the test site should be representative, the weed density should meet the experimental requirements, and the weeds should be evenly distributed. The weed community composition should be the same as that of the test herbicide. The herbicide spectrum is consistent. Record the Chinese and Latin scientific names of various weeds.

4.3 Cultivation conditions Soil conditions (soil type, organic matter content, pH, soil moisture, fertility) and tillage practices should be uniform and consistent across all experimental plots, and should meet the requirements of the current regulations. Agricultural practices in the field of earth science. The vegetable cultivation measures tested should conform to local production realities, and sowing (or transplanting) should be carried out according to the cultivation model specifications to ensure the sowing quantity in each plot. The number of transplanted plants, sowing depth, plant spacing, and row spacing should be consistent. Special attention should be paid to the prevention and control of diseases, pests, rodents, and birds when growing leafy vegetables. Record the main cultivation conditions of the tested vegetables, including cultivation methods and specifications, irrigation time, water volume and method, and fertilization time, type and method. Laws, etc. Record the previous crop and the herbicides used in the previous crop, and avoid selecting plots that may affect the growth of the tested vegetables or the effectiveness of the tested herbicides.

5 Experimental Design and Arrangement

5.1 Test Treatment Treatments such as experimental agents, control agents, manual weeding, and blank control should be set up.

6 Applying pesticides

6.1 Application Method Conduct the application according to the test requirements and label instructions, and ensure that the application is appropriate for local scientific agricultural practices. Record the application methods and procedures.

6.2 Application equipment Use commonly used equipment, or select equipment according to the test requirements. When using the spray method for pesticide application, choose a sprayer with stable pressure and a fan-shaped nozzle. The sprayer is used to apply the pesticide, ensuring that the pesticide is evenly distributed throughout the entire test plot or accurately and directionally distributed to the target area. Record the amount used. Information such as equipment type and operating conditions (working pressure, nozzle type, nozzle diameter, flow rate, etc.).

6.3 Application time and frequency Follow the test requirements and label instructions. If the application time is not specifically specified on the label, it should be determined based on the test objective and the test reagent. The application of pesticides is based on their therapeutic properties. Application time is divided into.

a) Before sowing or transplanting vegetables (with or without soil mixing);

b) Vegetables after sowing but before emergence (with or without soil mixing);

c) After the vegetables have emerged or been transplanted. Record the date and time of application, as well as the growth status of weeds and vegetables at the time of application (growth stage and the proportion of each type of weed, etc.).

6.4 Dosage and Water Consumption Apply the pesticide according to the test requirements and the dosage and water usage specified on the label. The dosage of the pesticide is expressed in g/hm2 (grams per hectare) of active ingredient. Dosage is expressed in mL/667m^2 (milliliters per 667 square meters) or g/667m^2 (grams per 667 square meters), and water consumption is expressed in L/hm^2 (liters per hectare). The volume is expressed in liters per hectare (L/667m^2) and liters per 667 square meters (L/667m^2). When the water volume is not specified in the experiment, it can be determined based on the method of action of the test agent and the type of sprayer. The water consumption should be determined based on the type of pesticide and local production conditions. Accurate dosage should be ensured during pesticide application; the dosage deviation between replicates of the same treatment should not exceed [a certain value]. ±5%. Record factors affecting efficacy, duration of action, and selectivity.

6.5 Data requirements for pesticides used to control pests, diseases, and non-target weeds If other pesticides are used during the trial, those that have no effect on the test pesticide, target weeds, and tested vegetables should be selected, and all plots should be treated accordingly. Perform homogenization treatment. It should be used separately from the test and control agents, and the name of the agent, application time, application method, and dosage should be recorded. Quantity, target of action, etc.

8 Equivalent to 35.1%~67.5% of the blank control area; - Level

9.Equivalent to 67.6%~100% of the blank control area.

7.1.2 Survey Time and Frequency The survey period varies depending on the type of vegetable cultivation and the timing of pesticide application; the specific number of surveys is as follows:

a) Apply pesticides before sowing, before transplanting, and before seedling emergence. - First survey. After weed emergence in the blank control area (visual assessment, control effect); - Second survey. 2-3 weeks after application (number of plants counted); - Third survey. 4-5 weeks after application or when the experimental agent reaches its peak efficacy (counting of plants and fresh weight); - Fourth survey. Before harvest (visual inspection, control effect).

b) Apply pesticides after emergence or transplanting. - First survey. On the day of application, before application (measurement of weed species, density, leaf age, and growth stage, etc.); - Second survey. 1-2 weeks after application (number of plants counted); - Third survey. 3-4 weeks after application or when the experimental agent reaches its peak efficacy (counting of plants and fresh weight); - Fourth survey. Before harvest (visual inspection, control effect).