EFFECT OF FUNGICIDES AND HERBICIDES INTERACTIONS ON TOMATO DAMPING-OFF AND PLANT GROWTH

Document Type : Original Article

Authors

1 Plant Pathology Research Institute, Agricultural Research Centre, Giza, Egypt

2 Institute of Environmental Studies and Research, Ain Shams University, Cairo, Egypt

10.21608/ejar.1993.462474

Abstract

Fusarium oxysporum f. sp. lycopersici and Rhizotonia solani were isolated from tomato seedlings showing damping-off symptoms. Both fungi caused high incidence of damping-off to UC-97and Super mar­mande tomato cultivars. The disease incidence varied according to each pathogen and the date of planting. High percentage of disease was de­tected when tomato seeds were planted in soil infested with F. oxyspor­urn f. sp, lycopersici during July, August and October. On the other hand, when tomato seeds were planted in soil infested with R. solani, the high­est incidence of damping-off disease was attained during October and December. Application of Enide or Devrinol as pre-emergence herbicide was not effective in minimizing the disease incidence. Vitavax-thiram or Vitavax-captan as fungicidal seed treatment were effective in controlling the disease. However, date of sowing affected the efficiency of these fungicides. Vitavax-captan gave better disease control than vitavax­thiram during October, while the reverse was observed during July and August plantations. Application of Enide enhanced the efficacy of Vita­vax-thiram against the Fusarium pathogen during october plantation while Devrinol enhanced the potency of Vitavax-captan during August plantation. The efficacy of these combined treatment against Rhizocto­nia pathogen did not greatly differ from the effect of each fungicide alone. However , they enhanced its efficiency against the mixture of both pathogens. Also, the application of these pesticides affected the growth of tomato plants.

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