T/NAASS 130-2025 Technical code of practice for prevention and control of avena sativa red leaf disease

Scope

This document specifies the terms and definitions, prevention principles, aphid monitoring, prevention methods, and occurrence survey for the prevention and control of red leaf disease in feed oats in Ningxia Yinchuan Irrigation Area. This document is applicable to the prevention and control of red leaf disease in feed oats in the Yinchuan Irrigation Area of Ningxia. 3 Terms and Definitions The following terms and definitions are applicable to this document. Oat red leaf disease A major viral disease of oats caused by the transmission of barley yellow dwarf virus by aphids. Its symptoms and occurrence patterns are described in Appendix 1 for reference. 4 Prevention Principles In accordance with the principle of "prevention-oriented and comprehensive prevention and control", the key measures are to prevent and control aphids and other vector insects. 5 Aphid Monitoring Aphid Species The main aphid species involved in virus transmission include Sitobion avenae and Schizaphis graminum. Monitoring Methods 5.2.1 Setting Sampling Areas During the seedling and tillering stages of oats, each 1 hm2 area is divided into 5 fixed monitoring points, each with an area of 100 m2. 5.2.2 Yellow Board Monitoring Five yellow sticky boards (25 cm × 30 cm) are evenly hung at each monitoring point. The lower edge of the boards is adjusted to 15 cm above the oat tops as the plants grow. The number of aphids is counted and recorded every 3 days, and the boards are replaced regularly. 5.2.3 Survey of Monitoring Points Five sampling points are randomly selected in each monitoring point, and 20 oat plants are surveyed to count the types and numbers of aphids. 6 Prevention Methods Aphid Prevention 6.1.1 Critical Prevention Period Late April to late May, during the seedling and tillering stages of oats. 6.1.2 Biological Pesticide Prevention Before sowing oats, mix the wettable powders of Metarhizium acridum or Beauveria bassiana with base fertilizer and

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