Influence of hydrogen cyanide-producing rhizobacteria in controlling the crown gall and root-knot nematode, Meloidogyne incognita

Egyptian Journal of Biological Pest Control

Table 7 Effect of six isolates of HCN-producing rhizobacteria on incidence of root-knot nematode on tomato plants in the absence or the presence of A. tumefaciens after 45 days of inoculation

Treatments	Pathogen	Incidence of root-knot nematode disease
		Nematode population in			Final population (Pf)	Reproduction factor (RF)	Reductions in nematode population %(Red %)	No. of galls	Root gall index (RGI)	No. of egg masses	Egg masses index (EI)
		Soil (250 g)	Root
		Soil (250 g)	Developmental stages	Females
P. japonica	M. incognita	784.0^EF	0.0^E	15.0^G	799.0^E	0.40	85.7	11.2^F	3.0	12.8^ABC	3.0
B. megaterium		1808.0^C	5.0^DE	44.2^B	1857.2^C	0.93	66.7	37.0^C	4.0	10.0^C	2.0
Pseudomonas sp. Gamma-81		500.0 ^FG	0.0^E	26.0^DE	526.0^EF	0.26	90.6	13.2^F	3.0	0.0^D	0.0
P. tolaasii		564.0^FG	0.0^E	29.2^CD	593.2^EF	0.30	89.4	16.0^EF	3.0	3.0^D	2.0
P. chlororaphis		428.0^FGH	0.0^E	16.0^FG	444.0^EFG	0.22	92.0	13.0^F	3.0	0.0^D	0.0
P. mosselii.		396.0^FGH	0.0^E	15.0^G	411.0^EFG	0.21	92.6	12.8^F	3.0	0.0^D	0.0
Control(+)		5412.0^A	87.4^A	74.6^A	5574.4^A	2.79	0.0	63.8^A	4.0	15.8^A	3.0
Oxamyl		244.0^GH	16.2^CD	27.8^CD	288.0^FG	0.14	94.8	21.6^DE	3.0	10.0^C	2.0
P. japonica	M. incognita + A. tumefaciens	1216.0^DE	10.0^CDE	31.6^CD	1257.6^D	0.63	72.4	31.4^C	4.0	12.0^BC	3.0
B. megaterium		608.0^FG	0.0^E	27.0^D	635.0^EF	0.32	86.1	23.2^D	3.0	0.0^D	0.0
Pseudomonas sp. Gamma-81		1348.0^D	19.4^C	35.2^C	1402.6^D	0.70	69.2	36.0^C	4.0	3.0^D	2.0
P. tolaasii		436.0^FG	0.0^E	25.8^DE	461.8^EF	0.23	89.9	22.2^DE	3.0	0.0^D	0.0
P. chlororaphis		486.0^FG	0.0^E	23.8^DEF	509.8^EF	0.25	88.8	21.4^DE	3.0	0.0^D	0.0
P. mosselii.		324.0^GH	0.0^E	18.4^EFG	342.4^FG	0.17	92.5	11.0^F	3.0	0.0^D	0.0
Control(+)		4456.0^B	59.6^B	44.8^B	4560.4^B	2.28	0.0	53.0^B	4.0	13.4^AB	3.0
Control(−)		0.0^H	0.0^E	0.0^H	0.0^G	0.0	0.0	0.0^G	0.0	0.0^D	0.0
Healthy plants		0.0^H	0.0^E	0.0^H	0.0^G	0.0	0.0	0.0^G	0.0	0.0^D	0.0

Means in the same column shared a letter are not significantly different (p ≤ 0.05); RF = final population in treatment/2000; Red% (reductions in nematode population%) = [(Pf_c − Pf_t)/Pf_c] × 100 where Pf_c = final population in control and Pf_t = final population (Pf) in treatment; RGI or EI was determined according to the scale given by Taylor and Sasser (1978)