Author: R. AHMAD AND T. MUKHTAR
Publishing Date: 2007
Volume 25 Issue 1
The effects of three Pasteuria penetrans isolates and their blend (Pp1, Pp2, Pp3 and Pp blend) on the production of galls and egg-masses by Meloidogyne javanica and on the number of juveniles per 500 g of soil over three crop cycles of egg plant were studied in pot experiments. The data were analyzed as “treated / control” and shown as D-gall, D-egg mass and D-juvenile. The three subsequent crops have affected the number of galls and egg-masses. After each crop the numbers of galls and egg-masses were significantly reduced, but a marked reduction was found after the third crop. A similar trend was also observed in numbers of juveniles. D-galls were 0.927, 0.581and 0.109; D-egg-masses were 0.470, 0.279 and 0.055 while D-juveniles were 0.755, 0.759 and 0.421 after first, second and third crop cycles, respectively. The three isolates of P. penetrans and their blend also affected the D-galls and D-eggmasses. Pp1, Pp2 and Pp blend behaved almost similarly for gall production. Comparatively less eggmasses were produced in Pp1, Pp2 and Pp3 as compared to Pp blend. No significant differences were recorded in number of juveniles after each crop for all the P. penetrans isolates. After first crop the numbers of spores attached were 6.00/J2 which rose to 13.15 spores / J2 after second crop and finally reached to 26.89 spores / J2 after third crop. The three isolates of P. penetrand and their blend also behaved significantly differently. The maximum numbers of spores attached were with Pp3 (23.15 spores / J2 followed by Pp blend (16.24 spores / J2), Pp1 (12.74 spores / J2) and
Pp2 (9.25 spores / J2).