Effect of Agents on Control of Root Knot Nematode Disease and Yield and Quality of Flue-cured Tobacco
The effects of chemical agents and microbial agents on the control of root-knot nematode disease in flue-cured tobacco were compared to provide a theoretical basis for effectively reducing the occurrence of root-knot nematode disease in flue-cured tobacco.Different treatments such as control(Yo),abamectin(Yi),oligosaccharide·fosthiazate(Y2),nematicidal Bacillus(Y3)and Brevibacillus brevis(Y4)were set up.The physical and chemical properties of soil,agronomic traits of flue-cured tobacco,control effect of root-knot nematode disease,photosynthetic characteristics,appearance quality of raw tobacco,economic traits and chemical composition after baking were compared and analyzed.The results showed that compared with the control,Y4 treatment significantly increased soil available nutrients and organic matter content,significantly promoted the growth of tobacco plants,and enhanced the disease resistance of flue-cured tobacco to tobacco root-knot nematode disease.The incidence and disease index were 23.59 percentage points and 11.03 lower than those of Y0 treatment,respectively.Y4 treatment significantly increased the net photosynthetic rate,stomatal conductance,intercellular CO2 concentration and SPAD value of flue-cured tobacco.The yield,average price,output value and proportion of middle and superior tobacco of flue-cured tobacco were the highest in Y4 treatment,which were 1.1,5.2,6.4 and 3.4 percentage points higher than those of the control,respectively.In terms of the chemical composition of flue-cured tobacco leaves,Y2 treatment was generally better.In summary,Brevibacillus brevis has a good control effect on tobacco root-knot nematodes,and has a good effect on improving soil physical and chemical properties,promoting the growth and development of flue-cured tobacco and improving yield and quality.
root knot nematode diseaseflue-cured tobaccochemical agentsmicrobial agentyield and qualitypest control effectivenesssoil physicochemical properties
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