TABLE 1.

Relative biocontrol activities of T. virens strains carrying the Psy1 disruption compared to the activity of parental isolate G20-M37

Straina	Relative biocontrol activityb
	R. solani			P. ultimum
	Expt 1	Expt 2	Expt 3	Expt 1	Expt 2
G20-M37	1.0	1.0	1.0	1.0	1.0
M37-T14		0.98	0.97		0.97
M37-T18	0.83	1.3	1.1	1.0	1.1
M37-T24		1.2	0.91		1.1
M37-T42	0.17∗	1.1	1.0	1.1	0.94
M37-T53		0.82	1.2		0.94
M37-T62	0∗	1.1	1.0	1.1	0.90
M37-T71	0∗	0.74	1.0	1.2	0.94

^aR. solani or P. ultimum was incubated with a T. virens strain for 10 to 13 days before eggplant seeds were planted. The T. virens strains used were recipient strain G20-M37 (glx mutant) and Psy1 disruptants (T strains). 

^bRelative increases in the plant stand values compared to the disease control values. All values are relative to the data obtained for G20-M37, the parental isolate, which was assigned a relative biocontrol activity of 1.00 for each experiment. Relative biocontrol activity was calculated as follows: (percent plant stand after treatment − percent plant stand for R. solani-inoculated control)/(percent plant stand with G20-M37 treatment − percent plant stand for R. solani-inoculated control). Values that are significantly different (P = 0.05) from the G20-M37 value as determined by Duncan's multiple-range test are indicated by an asterisk. The plant stand values for control treatments in which neither pathogen nor T. virens was used were 87 to 90%. The plant stand values for pathogen and uninfested bran treatments were 0% for R. solani in all three experiments and 30 and 0% for P. ultimum in experiments 1 and 2, respectively. The plant stand values for the G20-M37 treatment were 33 and 60% for R. solani in experiments 1 and 2, respectively, and 77% for P. ultimum in both experiments.