V. Sugavanam et al., EFFECT OF FUNGICIDES ON VESICULAR-ARBUSCULAR MYCORRHIZAL INFECTION AND NODULATION IN GROUNDNUT (ARACHIS-HYPOGAEA L), Agriculture, ecosystems & environment, 48(3), 1994, pp. 285-293
The effects of field application rates of six fungicides (Bavistin, Di
thane, Emisan, Fytolan, Thiram and Ziram), applied both as seed dress
and soil drench, on the formation and function of vesicular-arbuscular
mycorrhizal (VAM) and rhizobial nodular systems in groundnut (Arachis
hypogea L.) were investigated. Fytolan treatment produced a remarkabl
e range of positive responses in VAM infection and spore production, r
hizobial nodulation and growth and yield of the host plant. The other
fungicides restricted mycorrhizal infection to different levels. The r
hizosphere spore count was increased in the early growth stages of the
host by fungicides, but declined in the later stages. Their effect on
sporulation varied depending on VAM fungal species. Root nodulation,
growth and yield of the host plant were not significantly affected by
the application of fungicides, excepting the interference of Emisan in
the early growth stages. The inhibitory effects of Emisan on the VAM
and Rhizobium colonisation resulted in a significant decrease in the g
rowth and yield of the host plant.