ISHS Acta Horticulturae 808: II International Symposium on Tomato Diseases
ACTIVITY OF COMPOSTS MADE FROM POSIDONIA, POULTRY MANURE AND OLIVE EXTRACTS AGAINST PYTHIUM APHANIDERMATUM |
| Authors: | R. Khanfir Ben Jenana, M.A. Triki, R. Haouala, K. Hibar, A. Rhouma, M. Ben Khedher, B. Henchi |
| Keywords: | compost, Pythium aphanidermatum, tomato, antagonist effect |
| Abstract:
The main causal agent of damping-off and root rot of many crop plants is P. aphanidermatum Edson (Fitzp.). Biological control of Pythium is a promising means of reducing damping-off and offers reduced environmental impact compared to the use of fungicides. In this study, compost extracts (E1, E2 and E3) were tested for their effects on mycelial growth of the pathogen. Stand percentage and seedling length were measured for inoculated tomato (Solanum lycopersicum. cv. Rio Grande) in three substrates (S1, S2 and S3) containing one of three composts (C1, C2 and C3). Extracts E1, E2 and E3 inhibited P. aphanidermatum mycelial growth 22.8%, 16.0% and 14.6% respectively in vitro. Seedling stands in substrates containing the composts and irri¬gated with their corresponding extracts were 80% for S1, and 55% for S2 and S3, whereas in the inoculated control the seedling stand was 10%. Mean seedling lengths were 12 cm, 15 cm, 20 cm, 8 cm and 18 cm in S1, S2, S3, inoculated control (IC) and non-inoculated control (NIC) respectively. Our results showed that the investigated composts could be used as culture media. On the other hand, the compost extracts might be considered as an efficient means of biological control against P. aphanidermatum. | |
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