GB/T 17980.44-2026Pesticides - Guidelines for field efficacy trials - Part 44: Herbicides against weeds in orchards (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 44 of GB/T 17980, "Guidelines for Field Efficacy Testing 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;

44.Herbicides for Controlling Weeds in Orchards;

---Part 149: Insecticides for the Control of Red Imported Fire Ants. This document supersedes GB/T 17980.44-2000 "Guidelines for Field Efficacy Testing of Pesticides (I) Herbicides for Controlling Weeds in Orchards", and is consistent with... Compared with GB/T 17980.44-2000, apart from structural adjustments and editorial changes, the main technical changes are as follows:

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 the area of the residential area have been changed (see 5.3.2,

1 Scope

GB/T 17980.44-2026 is the Chinese national standard covering the trial protocol for orchard herbicides - the weed assessment by species and cover, and the crop safety observations on trees that will be in the same ground for twenty years. 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, so that trials run by different institutes can be compared. It replaces GB/T 17980.44-2000 and has been in force since 1 September 2026, one of six 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 17980.44-2000. 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 orchard weeds. This document applies to registered fields for herbicide control of weeds in orchards containing pome fruits, stone fruits, nuts, berries, persimmons, dates, citrus fruits, etc. Inter-drug efficacy small-area trials and safety evaluation.

4 Test conditions

4.1 Selection of Crops and Cultivars Use locally common cultivation methods and select widely planted varieties. Record crop species (including Chinese and Latin scientific names) and cultivation types. 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 cultivation methods, plant spacing, and row spacing of the tested fruit trees should conform to local production realities. The age of the fruit trees, etc., should be considered. The cultivar, rootstock, and growth vigor are consistent. It is advisable to conduct trials in densely planted orchards. Record the herbicides used in the previous growing season to avoid selecting plots that may affect crop growth 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 Follow the test requirements and label instructions, and ensure that the application of pesticides is compatible with 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 weeds emerge;

b) After the weeds sprout. Record the date and time of pesticide application, and the growth status of weeds and crops at the time of application (weed growth stage, proportion of each type of weed, and the condition of fruit trees). Age and growth and development period, 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/hm^2 (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 mode 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 crops should be selected, and all plots should be treated. Treat uniformly. It should be used separately from the test and control agents, and the name, timing of application, method of application, and dosage of the agent should be recorded. Action targets, 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 time varies depending on the crop cultivation type, application time, and pesticide characteristics. The specific number of surveys is as follows:

a) Apply herbicide before weeds emerge. - First survey. After weeds have fully emerged in the blank control area (visual assessment, control effect); - Second survey. One month after the first survey or when the experimental agent has reached its peak efficacy (number of plants and fresh weight measured). Following this survey, pesticides with long-lasting effects will be surveyed every month (visual assessment of control efficacy). - Final survey. Before harvest (visual assessment, control effectiveness).

b) Apply herbicide after weeds emerge. 1) Spring treatment. - First survey. On the day of application, or before application (measurement of weed species, density, leaf age, and growth stage, etc.); - Second survey. 2-5 days after application (visual inspection, assessment of rapid effectiveness) or 1-2 weeks after application (numerical count, number of plants); - Third survey. 3-4 weeks after application or when the experimental agent reaches its peak efficacy (counting of plants and fresh weight). Following this survey, pesticides with long-lasting effects will be surveyed every month (visual assessment of control efficacy). - Final survey. Before harvest (visual assessment, control effectiveness). 2) Summer or autumn treatment. - First survey. On the day of application, or before application (measurement of weed species, density, leaf age, and growth stage, etc.); - Second survey. 2-5 days after application (visual inspection, assessment of rapid effectiveness) or 1-2 weeks after application (numerical count, number of plants); - Third survey. 3-4 weeks after application or when the experimental agent reaches its peak efficacy (counting of plants and fresh weight). Following this survey, pesticides with long-lasting effects will be surveyed every month (visual assessment of control efficacy). - Final survey. Before harvest or 1 year after application (visual assessment of control effectiveness).