Potato gangrene control by ultra low volume sprays of thiabendazole

Abstract

A method is described by which a mist of thiabendazole (TBZ) is applied to potato tubers using an ultra low volume sprayer set over rotating rollers.The fungicidal solution (2 % a.i. TBZ) is applied at 2 l/t of potatoes moving through the mist at 50 kg/min.Effective control of gangrene in storage was achieved in laboratory and farm trials.

Efficacy of Benomyl and Thiabendazole in Controling Potato Gangrene Relative to the Time of Tuber Injury

“…Decreasing efficacy with increasing delay in application after lifting has also been found with organo-mercury fungicides and 2-aminobiitane (Boyd, 1960;Graham et al, 1973) possibly because taber skin becomes increasingly impervious after lifting or because F. exigua has penetrated too deeply for the fungicide to be effective (Graham et al, 1975). TMabendazole applied as an ultra low volume spray (Logan et al, 1975) or as a dust or dip will prevent infection of wounds made after treatment, either because the fungicide kills or inactivates the fungus at the tuber surface or perhaps because it becomes incorporated into the tissues when the tuber is wounded. In treatments in which infested soil was inoculated into wounds on previously treated tubers, the 10 per cent a.i.…”

“…The disease was controlled best by thiabendazole and dipping was more effective than dusting. Logan et at (1975) sprayed thiabendazole at ultra low volume on to tubers and prevented rotting at wounds made two days after treatment.…”

Experiments with foliar sprays of thiabendazole and captafol for control of potato gangrene

“…Dusts, dips and mists of thiabendazole applied immediately or soon after harvest to seed tubers for the control of gangrene during storage have been used extensively without evidence of yield reductions in the progeny (Hide et al 1969;Logan et al, 1975). foveata pycnidia on stems this had little effect on the incidence of gangrene in storage and was therefore of less practical importance than the reduction in size and number of progeny tubers in plants whose foliage had been sprayed with thiabendazole.…”

“…Control of the disease in storage may be achieved by dips and dusts (Hide, Hirst & Griffith, 1969) or mists (Logan, Copeland & Little, 1975) of the systemic fungicides benomyl and thiabendazole. This paper describes trials to investigate the effect of thiabendazole and a nonsystemic fungicide, captafol, on the incidence of pycnidia on senescent stems and the extent of disease control in storage.…”

Control of silver scurf (Helminthosporium solani) disease of potato with benomyl and thiabendazole

“…The discovery by Hide et al (1969) that the systemic fungicides benomyl and thiabendazole were suitable alternatives to the toxic organo-mercurial compounds for tuber disinfection to control tuber-borne pathogens is likely to make the use of chemical disinfection by growers more common. Investigations into the effectiveness of these chemicals and into ways of applying them have been carried out (Hirst, Hide, Griffith & Stedman, 1970;Logan, 1974;; Logan, Copeland & Little, 1975). Both benomyl and thiabendazole used as dusts or dips for seed tubers were found to reduce the incidence of silver scurf on progeny tubers at lifting (Hide et al 1969; French, 1973; Jouan, Lemaire, Perennec & Sailly, 1974;.…”