TABLE 2.

Biovar and Ti plasmid type of pathogenic isolates

Plot	Sampling date	No. of isolatesa
		Nopaline type				Octopine type
		Biovar 1		Biovar 2		Biovar 1		Biovar 2
		Soil	Root	Soil	Root	Soil	Root	Soil	Root
Beni Tamou	March 1990	16	NAb	0	NA	8	NA	0	NA
	April 18 1994	11	16	13	10	0	0	0	0
	June 23 1994	3	28	19	5	0	0	0	0
Boughrara	April 12 1998	3	3	2	0	0	0	0	0
	July 6 1998	2	2	6	1	0	3	0	0
Ouled Mimoun	April 15 1998	2	6	3	1	0	0	0	0
	July 7 1998	2	5	5	3	0	2	0	0

^aThe presence of nopaline-type Ti plasmids was determined by utilization of nopaline, synthesis of nopaline in incited tumors, sensitivity to K84, and hybridization with an nos probe. The presence of octopine-type Ti plasmids was determined by utilization of octopine, agropine, and mannopinic acid; synthesis of octopine, agropine, and mannopine in incited tumors; lack of sensitivity to K84; and lack of hybridization with an nos probe. Soil, bulk soil; Root, roots and soil particles tightly adhering to roots of weeds.

^bNA, not applicable.