A pot experiment was conducted to screen non-host plants
against M. incognita under greenhouse conditions. The greenhouse
conditions were 26/20 C and 14/10 cycles with a relative humidity
of 70e75%. Soil water contentwas maintained at about 50% of WHC
by daily supply of water. The soil was obtained from Beijing, China
(39。4000 N, 116。1500 E), a typical 30-year continuous cropping
greenhouse. The properties of soil samples were as follows: pH (in
water) 7.43, available nutrients: total N 277 mg kg1; Olsen-P155
mg kg1 and NH4OAc-K 208 mg kg1.