Resistance evaluation of rice variety ‘Guiyu 11’ to Nilaparvata lugens

Objective  To determine the resistance of rice variety ‘Guiyu 11’ to brown planthopper, Nilaparvata lugens, and provide technical supports for green control of N. lugens.

Method  The resistance of ‘Guiyu 11’ to N. lugens was systematically evaluated using seedling screening test, honeydew excretion measurement, laboratory evaluation of adult-plant and field investigation of N. lugens populations.

Result  ‘Guiyu 11’ and the resistant variety ‘Rathu Heenati’ (as the control) showed moderate resistance to N. lugens at seedling stage. The average quantity of honeydew secreted by N. lugens after feeding on ‘Guiyu 11’ for 24 hours was not significantly different from that of ‘Rathu Heenati’ at tillering and booting stages. At adult-plant stage, ‘Guiyu 11’ and ‘Rathu Heenati’ plants grew normally after infected by N. lugens for 15 days, while all plants of the sensitive variety ‘TN1’ withered and died. The field investigation of dynamic insect density showed that the average numbers of N. lugens on ‘Guiyu 11’ on June 19 and June 24 in 2019 were 218.33 and 436.67 per hundred clump, respectively, and were significantly lower than that on the sensitive variety ‘Liushayouzhan 202’.

Conclusion  ‘Guiyu 11’ is moderately resistant to N. lugens and shows significant inhibiting effect on the growth of N. lugens population in paddy field. ‘Guiyu 11’ can be applied to the ecological control of N. lugens.