Investigation And Comprehensive Control Effect Of Tobacco Black Shank Disease In Chongqing Wanzhou Area

Through the investigation in Wanzhou District of flue-cured and Burley tobacco black shank disease incidence of planting area, record field related to environmental conditions, different factor analysis to explore the influence and black shank disease regularity, to carry out comprehensive control of agricultural, reduce disease occurrence and harm, provide reference to recover the loss of tobacco production. Data survey conducted in 2012-2014, respectively, set up the system and the survey point, analysis method of table and drawing through the data, draw three conclusions.The incidence of tobacco black shank in Chongqing Wanzhou District:tobacco black shank occurred more widely, the survey township have occurred, above the onset of plot ratio reached 30% plots, plots of the highest average incidence reached more than 10%, need to cause enough attention; Wanzhou area tobacco black shank disease field period from late May to the rosette stage onset, Vigorous growing period to topping period recovery period is the peak period, recoveryperiod and reached the peak at. Effects of different factors on black shank:in the same planting area, transplanting 5d per advance, disease index can reduce 0.1-0.2; different elevation have a certain influence on the black shank, altitude per 100m, the disease index about can reduce about 0.1; caused by continuous cropping soil residual bacteria increased tobacco field rotation, the disease index decreased significantly about 0.2; Wanzhou district annual planting varieties Yunyan 87, compared to the K326 resistance is relatively high, Eyan 3 and Eyan 6 no significant difference; slope plots in the 10-20 degrees, beneficial to the field of ventilation drainage and water and fertilizer, tobacco black shank disease harm is lighter. Comprehensive prevention and control measures:to optimize layout through the use of early transplanting period, proper increase of planting tobacco field soil slope, elevation, choose suitable to implement land rotation, to eliminate the source of infection, strengthen disease resistance breeding and disease resistant varieties planting efforts, improve tobacco transplanting and field management level, maintain good health, in a timely manner in tobacco field chemical control means, to achieve the comprehensive prevention and control effect is very good, the field tobacco black shank disease incidence and prevalence significantly reduce the harm.