II 18 2"5 32 39 



DAYS AFTER FUMIGATION 



46 



Figure J. The relationship of percentage of infection of tomato ('Bonnie 

 Best*) (•■■■■•) and inoculum density of Fusarium oxysporum f. sp. radicis - 

 lycopersici (OlllllO) to time after fumigation of soils which were amended 

 with three isolates of Trichoderma harzianum , one isolate of Aspergillus 

 ochraceus , and one isolate of Penicillium restrictum at 1000 conidia of 

 each isolate per gram of soil; the pathogen subsequently was added at 

 1000 chlamydo spores per gram to 1500 g of soil every 7 days and tomato 

 plants were maintained in the infested soil for 14 days under growth- 

 chamber conditions before infection incidence and the inoculum density of 

 the pathogen were determined. 



