The present investigation was carried out to evaluate the potential of chitosan alone
and in combination with various agricultural wastes for the management of rootknot
nematode, Meloidogyne incognita on eggplant cv. ‘BR-112’ under greenhouse
conditions. The results showed that chitosan as a single or joint treatment with agricultural
wastes significantly (p ≤ 0.05) reduced root-knot indices, and the nematode
population in soil. As a result, of this, the growth and growth yielding attributes of
eggplant were remarkably augmented. Chitosan as an elicitor induced plant mediated
systemic resistance against M. incognita in eggplant. The results of the study
demonstrated that maximum reduction in eggmass/root, eggs/eggmasses, nematode
population and root-knot indices, was acquired by the treatments: chitosan + onion
and chitosan + mentha. It was followed by chitosan + Brassica, chitosan + urad
and chitosan + coconut whereas, chitosan combined with corn cob waste was found
to be the least effective when compared to the control. The application of chitosan
alone was effective but not very satisfactory. Compared to the control applications of
all the treatments significantly increased plant growth in terms of length, fresh and
dry weights, pollen fertility, yield and biochemical parameters such as chlorophyll,
carotenoid content and antioxidant enzymes. This may have been due to the eliciting
activity of chitosan, causing systemic resistance in the plant and the release of various
toxic chemical compounds during decomposition which have lethal effects against
the second stage juveniles of M. incognita and nematode multiplication.
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