Ralstonia solanacearum propagación

UF UNIVESSITY OF FLORIDA EDIS IFAS EXTENSION
2007 Florida Plant Disease Management Potato.
Pamela Roberts, Pete Weingartner, and Tom Kucharek2

Management Strategies Potato is vegetatively propagated by planting tubers which can carry many different pathogens. Therefore, it is especially important to include both preplant and post harvest strategies to control diseases in this crop. Many potato diseases during the cropping season and in the harvested crops are initiated as inoculum in seed tubers. For this reason utilization of certified inspected seed tubers is imperative for effective disease management in potatoes and a Florida Seed Law is in place to help ensure high quality seed tubers for Florida growers.
Bacterial Wilt and Tuber Brown Rot (Ralstonia solanacearum)Symptoms: Symptoms resemble those of bacterial ring rot. Initially terminal leaflets wilt on hot days. Wilt progresses rapidly during hot weather and individual branches or entire plants wilt. Leaves often turn yellow and leaf margins roll. Stem cross sections exhibit vascular browning and as wilt advances illustrate bacterial oozing which is more viscous that that of ring rot. Cut stems suspended in water will usually exude bacterial streams from the vascular system. Tuber symptoms progress from the stolon end and consist initially of mild browning which progresses to distinct vascular discoloration coupled with bacterial oozing when tubers are cut in cross section. Soil often adheres to bacterial oozing from the eyes of severely affected tubers. Complete disintegration of tubers often results from secondary invaders. Tubers from a single plant can vary from asymptomatic to complete rot.
Cultural Control: Maintaining a dense cover crop of sorghum/sudan grass or corn which crowd out broad-leaved weeds can reduce incidence of bacterial wilt. Avoid rotations with Solanaceous crops or planting highly susceptible cultivars such as Superior, Red LaSoda, LaRouge, or Pontiac. Do not move soil, water, or equipment from infested to non- infested fields. Incidence of tuber brown rot in the crop can be reduced by delaying harvest and allowing infected tubers to rot in the field.

Saludos. Elba (Moderadora)