Evaluation of some fumigants for control of potato bacterial wilt caused by Pseudomonas solanacearum

Abstract

All of the chemicals evaluated in field experiments, chloropicrin, D-D (1, 3-dichloropropene), MITC (methyl isothiocyanate), a mixture of D-D and MITC, metam-ammonium, DCIP (2, 2-dichlorodiisopropyl ether), and a mixture of chloropicrin and DCIP were effective for control of potato bacterial wilt caused by Pseudomonas solanacearum. Especially, injection of chloropicrin at 300l/ha, D-D at 400l/ha and a mixture of chloropicrin and DCIP at 300l/ha were highly effective. In these treated plots, the numbers of P. solanacearum in soil also decreased. A direct sterilizing effect of gas from these chemicals was recognized at 0.5mg/l of chloropicrin, at 5mg/l of MITC and at 10mg/l of D-D and DCIP in a 48 hour exposure test to the cultured pathogen. Results of the exposure test indicate that these chemicals have a direct effect in decreasing the density of the pathogen in soil and wilt incidence in the field.