Abstract
ABSTRACT Root-knot nematode (Meloidogyne incognita) is a serious pest of vegetables and major limiting factor in the commercial production of carrot in many parts of the world, including India. To avoid excess use of chemicals, an attempt was made to manage M. incognita infecting carrot by using bioagents viz., Trichoderma harzianum (indigenous and commercial) and Pseudomonas fluorescens (commercial) under field conditions. Among biocontrol agents, the lowest nematode population in soil (222.66/200 g) was recorded in isolated T. harzianum @ 25g/m2 (2 × 106 Cfu/g) treated plot than by commercial T. harzianum @ 20g/m2 . Maximum reduction of galls/rhizome (11.00), galls/5 g of root (36.00) and egg masses (11.33) per 5 gram of root was recorded in isolated T. harzianum @ 25g/m2 treatment compared to other treatments. Maximum shoot height (49.66 cm), shoot weight (26.00 g/rhizome) and rhizome yield (8.20 q/ha) were also recorded in isolated T. harzianum @ 25g/m2 followed by isolated T. harzianum and commercial T. harzianum @ 20g/m2.
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