Author: T.A. KHAN AND M.S. ASHRAF
Publishing Date: 2006
Volume 24 Issue 2
Inoculum level of 2000 second stage juveniles (J2) of Meloidogyne incognita and 1000 J2 of M. javanica per plant were detrimental or pathogenic to lettuce. With an increase in the inoculum levels from 250 to 8000 J2 per plant, there was a progressive increase in plant growth reduction and total population buildup of both the nematode species. The number of galls per root system also increased with an increase in the inoculum levels. However, the reproduction factor of both the nematodes decreased with an increase in the inoculum levels from 250 to 8000 J2 /plant. Principal symptom associated with root-knot infestation on lecture is the presence of oblong galls on the root system. Moreover, infected plant failed to produce head. Meloidogyne incognita and M. javanica required 32 and 29 days, respectively, to complete their life cycle on lettuce at a temperature ranging between 18-25o C.