Interaction of Fusarium oxysporum f. sp. ciceri and Meloidogyne javanica on Cicer arietinum.
Interaction of Meloidogyne javanica and Fusarium oxysporum f. sp. ciceri was studied on Fusarium wilt-susceptible (JG 62 and K 850) and resistant (JG 74 and Avrodhi) chickpea cultivars. In greenhouse experiments, inoculation of M. javanica juveniles prior to F. oxysporum f. sp. ciceri caused greater wilt incidence in susceptible cultivars and induced vascular discoloration in roots of resistant cultivars. Nematode reproduction was greatest (P = 0.05) at 25 degrees C. Number of galls and percentage of root area galled increased when the temperature was increased from 15 degrees C to 25 degrees C. Wilt incidence was greater at 20 degrees C than at 25 degrees C. Chlorosis of leaves and vascular discoloration of plants did not occur at 15 degrees C. The nematode enhanced the wilt incidence in wilt-susceptible cultivars only at 25 degrees C. Interaction between the two pathogens on shoot and root weights was significant only at 20 degrees C, and F. o. ciceri suppressed the nematode density at this temperature. Wilt incidence was greater in clayey (48% clay) than in loamy sand (85% sand) soils. The nematode caused greater plant damage on loamy sand than on clayey soil. Fusarium wilt resistance in Avrodhi and JG 74 was stable in the presence of M. javanica across temperatures and soil types.
Maheswari
T U
TU
Sharma
S B
SB
Reddy
D D
DD
Haware
M P
MP