How to prevent and control wheat rosette dwarf disease? Growers should take preventive measures in advance

Symptoms and characteristics of rosette dwarf disease: infected plants have yellow-green alternating stripes on the upper leaves, increased tillering, stunted and dwarfed plants in a rosette-dwarf form, and generally cannot joint or head. Plants infected in early spring show symptoms successively during the green-up stage and jointing stage, with stripes on the heart leaf, a relatively darker green leaf color, and slightly thicker and sturdier stems. After jointing, infected plants show stripes only on the upper leaves, and any grains that can head are shriveled and thin.

Transmission route: wheat rosette dwarf virus is not transmitted through sap, seeds, or soil, and is mainly transmitted by the small brown planthopper, making it an insect-borne viral disease.

Control methods: (1) Agricultural control measures. For example, flat planting of wheat, reasonable arrangement of relay intercropping, and avoiding relay intercropping with grass family plants; intensive cultivation and meticulous farming to eliminate the living environment of the small brown planthopper and reduce virus sources and insect sources; sowing in contiguous fields at the appropriate time and avoiding early sowing; winter irrigation of wheat fields to protect seedlings and reduce overwintering of the small brown planthopper; early fertilization and watering during the wheat green-up stage to increase the heading rate. Remove weeds; many weeds are hosts of planthoppers and also sources of wheat viral disease. Clearing weeds at field edges and beside ditches eliminates virus sources and has insecticidal and disease-preventive effects. (2) Chemical control. Use 10% imidacloprid wettable powder at 2000 3000 times dilution, or 5% acetamiprid wettable powder at 2000 3000 times dilution, to control the small brown planthopper and reduce insect sources. In affected fields, spray Bingdu Kexing aqueous solution at 500 times dilution, and pull out and destroy diseased plants.