Pathogen Identification and Chemical Control Techniques Against Root-knot Nematode Disease of Facility Watermelon in Huyi District of Xi'an City
The occurrence,damage and pathogen species of the watermelon root-knot nematode disease were investigated at facilities in the Huyi District,Shaanxi Province.Safe and efficient pesticide control technologies against this disease were screened to ensure the healthy development of the Shaanxi watermelon industry.In May 2022,the incidence and disease index of root-knot nematode disease were determined in the main watermelon planting bases of Huyi District.Root-knot nematodes were isolated from watermelon root samples,the species was identified by morphological and molecular identification methods,and the effects of different chemicals were evaluated.The results showed that the average diseased field rate,diseased plant rate,and disease index in the main watermelon production area of Huyi District were 92.9％,88.7％,and 73.1 respectively.Based on the morphological characteristics of second-stage juveniles,the perineal patterns of female adults,and molecular identification,Meloidogyne incognita was identified as the infectious nematode in watermelons.The test showed that 98％dazomet had a significant inhibitory effect.The appropriate dosage was 150 kg/hm2 of soil,reached 100％inhibition in 30 days and 92.1％in 70 days.In addition,soil treatment with 41.7％fluopyram(2250 mL/hm2)before transplanting watermelons could effectively inhibit M.incognita infection.After 70 days,the relative inhibitory effect was 75.7％,which was better than root irrigation.
Meloidogyne spp.watermelonoccurrencepathogen identificationchemical controlHuyi District
万方数据
维普
