MECHANISM OF LANTANA CAMARA LEAF EXTRACTS IN THE MANAGEMENT OF MELOIDOGYNE INCOGNITA ON TOMATO
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Date
2019-07
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AAU, Jorhat
Abstract
An experiment was carried out on the mechanism of Lantana camara leaf extract in the
management of Meloidogyne incognita on tomato. For this, leaf extract of L. camara
(25gm/75ml w/v) were evaluated at 25, 50, 75 and 100 percent concentration through egg hatch
inhibition and larval mortality test. The result of the in-vitro efficacy test showed that maximum
egg hatch inhibition of M.incognita was recorded in the 100 percent concentration of L. camara
leaf extract where as minimum was recorded in the 25percnet concentration after 7 days of
exposure time. The maximum mortality of M. incognita J2was recorded in the 100 per cent
concentration of L. camara leaf extract where as minimum was recorded in the 25 per cent
concentration after 24, 48, 72 and 96 hours of exposure time. No mortality was recorded in the
control treatment i.e. sterile distilled water. It was observed that there was an increasing trend in
the mortality of J2 with increase in the concentration and time of exposure. Similarly, egg hatch
inhibition was also found to be more with increase in the concentration. A pot experiment was
conducted to explore the biochemical mechanism of leaf extracts of L. camara in the
management of M. incognita on tomato. For this the activity of defence related enzymes viz.,
peroxidase (PO), polyphenoloxidase (PPO) and total phenol content were observed at 25,50,75
and 100 percent concentration of L. camara leaf extract after 35and 45 DAI of M .incognita in
tomato. Among the different concentrations, highest activity of peroxidase (PO),
polyphenoloxidase (PPO) and total phenol content was observed at 100 percent concentration
while the minimum activity was recorded in the 25 percent concentration both after 35and 45
DAI. However, maximum activity of the biochemical compounds was recorded at 35 DAI while
the same declined at45 DAI. The lower concentration of L. camara leaf extract viz., 25 and 50
percent showed stimulatory effect on plant growth parameter whereas higher concentrations
viz., 75 and 100 percent concentration of L. camara leaf extract showed inhibitory effect on
plant growth. The maximum plant growth parameter like shoot height, shoot weight (fresh) and
root length and root weight (fresh), dry shoot weight were recorded in the 50 percent
concentration of L. camara leaf extract where as the minimum was recorded in the nematode
alone treatment. The minimum nematode multiplication like number of galls, number of
eggmasses and final nematode population in soil were recorded in the 100 percent concentration
of L. camara leaf extract followed by 75, 50 and 25 percent concentration.
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