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GB/T 45211.8-2025Technical code of practice for evaluation of resistance to diseases and insect pests in wheat — Part 8: Blossom midges (English PDF)

小麦抗病虫性评价技术规程第8部分：吸浆虫

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 24, 2025

Implementation date

August 1, 2025

Scope

GB/T 45211.8-2025 is the English-translated version of 小麦抗病虫性评价技术规程第8部分：吸浆虫.

GB/T 45211.8-2025 is the Chinese national standard covering how a wheat line stands up to the blossom midge — the identification nursery and its siting where the pest occurs naturally, the soil quadrat sampling that shows the larvae and pupae are really there before anything is scored, the counting of insects per ear at the adult stage, the estimated loss rate that turns an insect count into the yield a grower would lose, and the resistance classes. Part 8 of the series, which takes the eight major pests and diseases of wheat one part at a time. First edition, under the Ministry of Agriculture and Rural Affairs. In force from 1 August 2025. Issued on 24 January 2025, it has been in force since 1 August 2025.

Document preview — GB/T 45211.8-2025

National Standard of the People's Republic of China

ICS: 65.020.01
Classification: B 15

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

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 wheat midge wheat blossom midge
3.2 Insect pest resistance
3.3 estimated loss rate of insect pests
3.4 quadrat sampling and number of insects per quadrat
4 Evaluation Procedure

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting is required.

This document is part 8 of GB/T 45211 Technical Specification for Evaluation of Disease and Pest Resistance of Wheat. GB/T 45211 has been published as follows. part. --Part 1: Stripe rust; --Part 2: Leaf rust; --Part 3: Stem rust;

--Part 4: Fusarium head blight; --Part 5: Sheath blight;

--Part 6: Yellow dwarf disease; --Part 7: Aphids; --Part 8: Midges.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the Ministry of Agriculture and Rural Affairs of the People's Republic of China.

This document was drafted by: Institute of Plant Protection, Chinese Academy of Agricultural Sciences.

The main drafters of this document are Chen Wanquan, Liu Taiguo, Chen Julian, Cheng Dengfa and Cao Yazhong.

Introduction

GB/T 45211 "Technical Procedures for Evaluation of Wheat Disease and Insect Resistance" aims to standardize the technical methods, operating procedures and identification methods of wheat disease and insect resistance.

Establish evaluation principles and provide standardized technologies for breeding material screening, hybrid offspring selection, disease resistance gene discovery and variety evaluation and approval.

This method plays an important role in guiding and promoting disease-resistant breeding, variety layout and plant quarantine of wheat in China.

GB/T 45211 is divided into the following 8 parts for the 8 major pests and diseases that cause great harm. --Part 1: Stripe rust; --Part 2: Leaf rust; --Part 3: Stem rust;

--Part 4: Fusarium head blight; --Part 5: Sheath blight;

--Part 6: Yellow dwarf disease; --Part 7: Aphids; --Part 8: Midges.

Technical regulations for evaluating wheat disease and insect resistance Part 8: Midges

1 Scope

This document defines the terms and definitions of wheat resistance evaluation technology, establishes the evaluation procedures, and specifies the content of field resistance identification.

The verification method is described.

This document applies to the field characterization and evaluation of resistance of wheat plants to midges.

2 Normative references

GB/T 24501.2

NY/T 616

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 wheat midge wheat blossom midge

It belongs to the family Diptera. It uses its larvae to rip the pericarp of wheat fruit that is still filling with grain and suck the sap, causing the grains to become thin or even empty. Pests.

Note. In China, the main species is the red wheat midge (Sitodiplosis mosellana), while in mountainous areas and some special ecological areas, there is the yellow wheat midge (Contarinia tritici).

3.2 Insect pest resistance

Plants have heritable traits that make them resistant to insect infestation.

3.3 estimated loss rate of insect pests

Based on the number of insects in each ear of wheat kernels, the yield loss caused by insect pests is estimated as a percentage of the receivable yield.

3.4 quadrat sampling and number of insects per quadrat

The number of each effective insect stage contained in a sample plot is the insect population of a sample, which is used to indicate the insect population density of larvae, pupae and other insect stages in the soil.

Note. Sampling is carried out according to the sampling method specified in NY/T 616.A soil sample square (10 cm x 10 cm x 20 cm) taken by a soil sampler is a sample square.

4 Evaluation Procedure

The evaluation procedure of wheat resistance to midge includes identification of nursery site selection and setting, natural insect susceptibility, resistance classification at adult stage, estimated loss rate from insect pests, and

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 24501.2Technical specification for control of wheat stripe rust (Puccinia striiformis West.) and wheat midge - Part 2: Wheat midge

NY/T 616

Cited by

GB/T 47359-2026Technical specification for the control of wheat midge

Editions of GB/T 45211.8

Edition	Title	Revision	Status
GB/T 45211.8-2025	Technical code of practice for evaluation of resistance to diseases and insect pests in wheat - Part 8: Blossom midges	current edition	Current

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