The effect of treating seed potato tubers with benzimidazole, imidazole and phenylpyrrole fungicides on the control of rot and skin blemish diseases.
Carnegie, S. F., Cameron, A. M., Lindsay, D. A., Sharp, E. and Nevison, I. M.
Annals of Applied Biology Year: 1998 Vol: 133 Issue: 3 Pages: 343-363 Ref: 26 ref.
1998
บทคัดย่อ
Over 6 yr the effectiveness of imazalil, prochloraz and fenpiclonil, applied either alone or in a mixture, in controlling gangrene (Phoma foveata [P. exigua var. foveata]), dry rot (Fusarium solani var. coeruleum), skin spot (Polyscytalum pustulans) and silver scurf (Helminthosporium solani) on potato tubers in store was compared with that of 2-aminobutane [butylamine] and thiabendazole. An assessment was also made of their efficiency in controlling the development of these diseases on the daughter tubers of seed tubers treated at harvest or before planting. Overall, 2-aminobutane was more effective in controlling gangrene in store than the spray-applied fungicides. Deposits of imazalil, thiabendazole and fenpiclonil were greater when sprays were applied with an electrostatic sprayer than with an hydraulic sprayer. The opposite was found with the mixture of prochloraz Mn and tolclofos-methyl. More effective gangrene control was associated with the highest deposits. Fenpiclonil and the mixture of
thiabendazole and imazalil were more effective in controlling dry rot than imazalil alone. The development of dry rot was, however, increased by 2-aminobutane treatment on 8 out of 14 stocks. 2-aminobutane gave the greatest reduction (83%) in the severity of skin spot during storage whereas thiabendazole alone, and the mixture of thiabendazole and imazalil, gave mean reductions of 70% and 65% respectively. This mixture and fenpiclonil gave the greatest reduction in the severity of silver scurf although, in general, reductions in silver scurf with fungicide treatment were less than with skin spot. The type of sprayer used to apply a fungicide did not affect the effectiveness of the fungicides in controlling either skin spot or silver scurf on tubers in store, or on the daughter tubers. The incidence of gangrene and dry rot on daughter tubers was not reduced consistently by fungicide treatment of seed tubers of the 6 stocks tested. However, the severity of skin spot and silver scurf was reduced by fungicide t
reatments of all 8 stocks but the reduction in disease was greater for skin spot than for silver scurf. All fungicides gave reductions in the severity of skin spot, and fenpiclonil and the mixture of thiabendazole and imazalil were the most effective for silver scurf. The effectiveness of the fungicides in controlling these diseases was similar for seed treated at harvest and that treated before planting.