Effect of fallow periods on the yield and the incidence of Pseudomonas solanacearum on potato in Honduras.
Agrimycin [streptomycin], Benlate [benomyl] and PCNB [quintozene] were applied to potato seed pieces and soil in a plot never planted with potatoes before and to plots from which potatoes had been harvested 2 yr, 1 yr and 1 week earlier. The previous potato crops had shown symptoms of infection by P. solanacearum. Marked differences in yields of the newly planted crop indicated that continuous harvesting of potatoes or fallow periods of only 1 yr were inadequate. A min. fallow period of 2 yr resulted in good yields, comparable with those from new land. The chemicals apparently failed to control the disease.