Water extracts of 7 and 18, out of 23 plant species screened in vitro inhibited conidial germination of Sarocladium oryzae (rice sheath rot pathogen and Fusarium oxy. f. lycopersici (tomato wilt pathogen) respectively. Water extracts of Caesalpinia pulcherrima and Ipomaca crassicaulls at 10 and 5 per cent sprayed (1) before inoculation (ii) before and also after inoculation (iii) After disease development reduced the sheath rot disease incidence in pot culture experiments; the latter was more effective than the former. Ten per cent conc. was more effective than 5 per cent and the extracts sprayed both before and also after inoculation showed the lowest disease incidence.
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