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GB/T 17980.24-2026Pesticides - Guidelines for field efficacy trials - Part 24: Fungicides against scab of pear (English PDF)

农药　田间药效试验准则　第24部分：杀菌剂防治梨黑星病

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 27, 2026

Implementation date

September 1, 2026

Scope

GB/T 17980.24-2026 is the English-translated version of 农药　田间药效试验准则　第24部分：杀菌剂防治梨黑星病.

GB/T 17980.24-2026 is the Chinese national standard covering the trial protocol against pear scab - a disease assessed on the fruit as well as the leaves, because a scabbed pear is unsaleable however healthy the tree. 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, disease or weed and of the crop, and the analysis of the result. It replaces GB/T 17980.24-2000 and has been in force since 1 September 2026. It was issued on 27 February 2026 and has been in force since 1 September 2026, replacing GB/T 17980.24-2000. 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.

Document preview — GB/T 17980.24-2026

National Standard of the People's Republic of China

ICS: 65.100
Classification: B 17
Replacing: GB/T 17980.24-2000

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
4 Test conditions
5 Experimental Design and Arrangement
5.2 Reagents
5.3 Community Arrangement
6 Applying pesticides
7 Survey
7.1 Drug Efficacy Survey
7.4 Impacts on other organisms
7.5 Meteorological and Soil Data
8 Methods for calculating drug efficacy
8.1 Formula for Calculating Drug Efficacy
9 Results and Report Writing

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 24 of GB/T 17980, "Guidelines for Field Efficacy Testing of Pesticides". GB/T 17980 has already 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;

24.Fungicides for the Control of Pear Black Spot;

---Part 149: Insecticides for the Control of Red Imported Fire Ants. This document supersedes GB/T 17980.24-2000 "Guidelines for Field Efficacy Tests of Pesticides (I) Control of Pear Black Spot by Fungicides", and is consistent with... Compared with GB/T 17980.24-2000, 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 test conditions have been changed (see Chapter 4, Chapter 2 of the.2000 edition);

c) Added requirements for experimental treatments and blank controls (see 5.1);

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

3.1 of the.2000 edition);

e) Changes were made to cell arrangement, cell size, and duplication requirements (see 5.3,

3.2 of the.2000 edition);

1 Scope

This document describes a field plot trial of a fungicide for controlling pear scab (Venturiapirina, Venturianashicola). method. This document applies to field efficacy plot trials and efficacy evaluations of fungicides for the control of pear scab. Other field efficacy trials should refer to [reference needed]. Follow the instructions.

4 Test conditions

4.1 Selection of test subjects, crops and varieties The test subject was black star disease. The experimental crop was pear trees. Disease-susceptible varieties or locally cultivated varieties were selected, and the variety names were recorded. The variety, tree age, and other relevant information should be recorded. Fruit trees with basically the same spacing and vigor.

4.2 Environmental Conditions All experimental plots should have uniform cultivation and management practices (soil type, fertilization, irrigation) that conform to local scientific agricultural practices. Record the cultivation management measures during the experiment, including the timing, quantity, and method of irrigation, fertilization, etc.

5 Experimental Design and Arrangement

5.1 Test Treatment Test reagents, control reagents, and blank controls should be included.

5.2 Reagents

5.2.1 Test reagents The test reagent should be applied at least three times; in special cases, the dosage should be set according to experimental requirements. Specify the Chinese/English common name or code of the reagent. Dosage form, active ingredient content, manufacturer, production date or batch number, expiration date, etc.

5.2.2 Control reagent The control agent should be a registered, locally commonly used product with good efficacy and safety in actual use. The type and function of the control agent should be clearly defined. The method should be the same as or similar to that of the test drug, and the registered dosage should be used. If the test drug is a compound formulation, a single dose of each active ingredient should also be included as a control. Control drug. Special cases may vary depending on the purpose of the experiment. Record the Chinese/English common name, dosage form, active ingredient content, and manufacturer of the control drug. The product name, registration number, production date or batch number, and dosage are required.

5.3 Community Arrangement

5.3.1 Layout of the community The experimental, control, and blank control plots were randomly assigned to blocks, and the plot arrangement was recorded. Special circumstances should be noted. illustrate.

5.3.2 Area of the community and duplication Area of each plot. There should be no fewer than 3 mature fruit trees in each plot, and the area of the plot should be recorded. Number of repetitions. at least 4 repetitions.

6 Applying pesticides

6.1 Application Method Follow the test requirements and label instructions. Application methods should be adapted to local scientific agricultural practices. Record the application methods and procedures. process.

6.2 Application equipment Select commonly used equipment in production, or choose equipment according to experimental requirements. Record the type of equipment used and its operating conditions (e.g., working pressure, etc.). All information regarding nozzle type and nozzle diameter.

6.3 Application time and frequency Conduct the experiment according to the test requirements and label instructions. Record the number of applications, the date of each application, and the crop growth stage. The first application should be made at the site of the disease. Before or at the initial stage of an outbreak, the decision to apply pesticide again depends on the development of the disease during crop growth.

6.4 Dosage Administer the medication according to the test requirements and the dosage specified on the label, and record the amount of active ingredient used, usually expressed in mg/kg (milligrams per kilogram). Spray. When applying the pesticide, record the dilution ratio and the amount of pesticide solution used per hectare, expressed in L/hm2 (liters per hectare). The amount of pesticide applied should be uniform. Uniform distribution. Dosage deviation should not exceed ±10%. If it exceeds ±10%, its impact should be recorded and assessed.

6.5 Chemical requirements for controlling other diseases, pests, and weeds If other agents are used, those that have no effect on the test agent and the test subjects should be selected, and all plots should be treated uniformly. Use separately from test and control agents to minimize interference from these agents. Record the accurate number of doses administered. Information such as the generic name of the drug, dosage form, content of active ingredient, manufacturer, dosage, application method, application time, and target pests.

7.1 Drug Efficacy Survey

7.1.1 Survey Methodology At least three trees should be selected and marked for the survey in each area. For each tree, samples should be taken from five points on the east, south, west, and north sides of the canopy. Each point should be marked and the survey conducted in the current year. 20 leaves and 20 fruits on the new shoot. For bagged orchards, only the leaves need to be surveyed. The leaf survey classification is as follows:

0.No disease;

1.The area of lesions is less than 10% of the total leaf area;

3.The area of lesions accounts for more than or equal to 10% but less than 25% of the total leaf area;

5.The area of lesions accounts for more than or equal to 25% but less than 40% of the total leaf area;

7.The area of lesions accounts for more than or equal to 40% but less than 65% of the total leaf area;

9.The area of lesions accounts for more than or equal to 65% of the total leaf area. The fruit survey and grading are as follows: Grade

0.No disease spots on the fruit;

1.Each fruit has 1 to 2 lesions;

3.Each fruit has 3 to 4 lesions;

5.Each fruit has 5 to 6 lesions;

7.Each fruit has 7 to 10 lesions, some of which are connected and cover about one-fifth of the fruit area;

9.Each fruit has more than 10 lesions, and the lesions are connected and cover more than one-quarter of the fruit area.

7.1.2 Survey Time and Frequency Before applying the pesticide, investigate the baseline disease incidence. Determine the timing and frequency of investigations during the application period based on disease development or experimental requirements. (The last application...) Efficacy investigations should be conducted 7 to 14 days after administration. For drugs with a long duration of effect, further investigations can be conducted.

7.4 Impacts on other organisms

7.4.1 Impact on other pests and diseases Observe and record any effects of the pesticide on other pests and diseases in the test area, including both beneficial and harmful effects.

7.4.2 Effects on other non-target organisms Observe and record the effects of the agent on wild organisms and beneficial arthropods in the experimental area.

7.5 Meteorological and Soil Data

7.5.1 Meteorological Data During the experiment, rainfall data (rainfall type, daily rainfall, and daily rainfall in mm) was recorded from the test site or the nearest weather station. Data on temperature (daily average temperature, maximum and minimum temperatures, expressed in °C) and other adverse weather conditions affecting the test results throughout the entire test period were recorded. Climate factors, such as severe or prolonged drought, torrential rain, hail, etc.

7.5.2 Soil Data Record information such as soil type, soil fertility, moisture (dry, wet, or waterlogged), and soil cover (crop residue, plastic film cover, weeds).

8.1 Formula for Calculating Drug Efficacy

8.1.1 Disease Index The disease index is calculated using formula (1).

8.1.2 Prevention and control effect The prevention and control effect is calculated according to formula (2).

8.2 Statistical Analysis Appropriate biostatistical methods (such as Duncan's new multiple range method or other multiple comparison methods) should be applied to analyze the results and determine the significance of differences. Compare the sexes and indicate the statistical analysis software used.

9 Results and Report Writing

Based on the experimental results and statistical analysis, the product characteristics, efficacy, safety, and key usage techniques were evaluated, and an experimental report was compiled. The report should include a summary table of the original data. GB/T 17980.24-2026. Field Efficacy Trial Guidelines for Pesticides - Part 24. Control of Pear Black Spot by Fungicides ICS

17 National Standards of the People's Republic of China Replaces GB/T 17980.24-2000 Guidelines for Pesticide Field Efficacy Trials Part

24.Fungicide Control of Pear Black Spot Published on 2026-02-

27 Implemented on 2026-09-

01 State Administration for Market Regulation The State Administration for Standardization issued a statement.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.

Editions of GB/T 17980.24

Edition	Title	Revision	Status
GB/T 17980.24-2026	Pesticides - Guidelines for field efficacy trials - Part 24: Fungicides against scab of pear	current edition	Current
GB/T 17980.24-2000	Pesticides - Guidelines for field efficacy trials - Part 24: Fungicides against scab of pear	previous edition	Superseded

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