Table 1. Comparison of Meloidogyne strain clump formation and attraction to cyanide^a.

Species and strains	Nematode isolate origin:Host and geographic location	Clumps inPF-127 by48 h	2 mM KCN:# J2 within 5 mmat 3 hb	2 mM KCN: clump formation by 24 h
M. hapla
VW9	Tomato, CA, USA	Yes	116.8a	Yes
VW10	Hemp, The Netherlands	Yes	65.4b	Yes
VW11	Everlasting flowers, The Netherlands	Yes	74.7b	Yes
VW12	Tomato, CA, USA	Yes	65.7b	Yes
LM	Unknown host, France	No	50.0c	No
NCS	Unknown host, North Carolina, USA	No	48.0c	No
M. javanica
VW4	Unknown, CA, USA	Yes	46.8c	Yes
VW5	Unknown, CA, USA	Yes	50.8c	Yes
M. incognita
VW6	Cotton, CA, USA	Yes	20.3d	No
Beltran	Lima bean, CA, USA	Yes	31.3d	No
Harmony	Grape, CA, USA	No	9.6e	No
557R	Tomato, NC, USA	Yes	30.3d	No
W1	Tomato, CA, USA	Yes	23.6d	No

^aPetri dishes contained 300 J2 per ml PF-127 gel.

^bAverage number of nematodes within 5 mm of the small opening of the dispenser minus the average number of nematodes in the corresponding region with a dispenser containing PF-127 gel alone. Significant differences are indicated by different letters (P<0.05).