Evaluation of the Control Efficacy of Mating Disruption by Active High Dose Aerosol Pheromone Dispensers on Rice Pests

doi:10.16409/j.cnki.2095-039x.2024.03.012

Abstract

Abstract: To explore the applied technology and evaluation of aerosol sex pheromone for mating disruption to control Chilo suppressalis Walker in hilly, irregular but flat rice fields. The populations of stem borer, rice leaf roller, rice planthopper and main natural enemies were investigated in the mating disruption and control paddy field. The results showed that the number of moths trapped in the control was significantly higher than those trapped in the area by mating disruption. The average disrupted rate of C. suppressalis moths was 75.3%, and that of Cnaphalocrocis medinalis Guenée moths was 89.9%. The damaged rate by stem borers showed an increase with time. The damaged rate of stem borers in the control was 1.41%, on October 20, significantly higher than that in the mating disruption 0.17%. The number of larvae per tuft in the mating disruption was 0.02, significantly lower than the 0.27 larvae in the control. Surveys on September 19 and October 7 showed that the rate of leaf rolling in the mating disruption was significantly lower than that in the control, however, no significant difference was found in the larvae of C. medinalis between mating disruption and control areas. The number of rice planthoppers showed an increase with time, and there was no significant difference in the early stage. In the control, the number of rice planthoppers surveyed on September 19 was 8.2 per tuft in the control and 0.4 per tuft in the mating disruption. On October 20, the number of rice planthoppers in the control was 53.6 per tuft, significantly higher than the 1.4 per tuft in the mating disruption. The number of parasitoids in the rice fields was significantly higher in the mating disruption 0.14 per tuft than in the control 0.08 per tuft. The number of spiders in the mating disruption was 2.11 per tuft, and in the control was 3.30 per tuft, with no significant difference. The number of Cyrtorhinus lividipennis Reuter in the mating disruption was 0.10 per tuft, and 0.01 per tuft in the control, with no significant difference. Using aerosol high dose sex pheromone dispensers in rice planting fields in hilly areas is effective for controlling population control and reduces the damage inflicted by C. suppressalis. The use of dispensers also strongly disrupted the calling and mating of rice leaf rollers C. medinalis, which indirectly and effectively controled the occurrence of planthoppers in late-stage rice crops. The reason may be that the specificity of sex pheromones protected the population of natural enemies in the paddy fields.

Key words: Chilo suppressalis, Cnaphalocrocis medinalis, rice planthoppers, sex pheromone, mating disruption, aerosol dispenser

CLC Number:

S476

WANG Weiying, CHEN Yu, ZHAO Hong, GUO Qianshuang, DU Yongjun. Evaluation of the Control Efficacy of Mating Disruption by Active High Dose Aerosol Pheromone Dispensers on Rice Pests[J]. Chinese Journal of Biological Control, 2024, 40(6): 1293-1301.

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