Evaluation of management practices against Polyphagotarsonemus latus (Banks) and its role as vector of leaf curl virus in chilli
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Date
2018
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CCSHAU
Abstract
Under in vitro 35.00 to 67.27 and 33.89 to 63.89 percent mortality of P. latus was recorded in Direct
Spray Bioassay, with 2.5 to 10.0 % and 1.25 to 10.0 % seed and leaf extract concentrations of P. pinnata,
respectively. LC50 values of methanolic seed and leaf extract of P. pinnata were 5.36 and 5.31, respectively for
mobile stages of P. latus. Under field conditions, the percent reduction in P. latus was from 40.60 to 72.55
percent with all the treatments concentration of P. pinnata. Under in vivo P. pinnata seed extract 10.0%
(72.55%), was the most potent in reducing the mite population followed by P. pinnata leaf extract 10.0% (65.10
%), P. pinnata seed extract 7.5 % (62.66 %), P. pinnata seed extract 5.4 % (55.49%), P. pinnata leaf extract 7.5
% (54.98 %), P. pinnata seed extract 5.0 % (48.33%), P. pinnata leaf extract 5.3 % (47.58%), P. pinnata leaf
extract 5.0 % (40.16%) and Pyriproxyfen 5% + Fenpropathrin 15% EC (1ml/l H2O) (37. 83%), respectively.
Studies on seasonal incidence of P. latus revealed a peak in its population on chilli during second fortnight of
October during the respective crop seasons in both the years under field conditions. Strata wise, top strata
harboured significantly more number of mites followed by middle and bottom strata. A comparison of mulch
treatments showed that Organic mulch 12t/ha was most effective in reduction of P. latus population (79.30 %),
followed by Black/Silver polythene sheet (78.50 %), Black/White polythene sheet (78.30 %), Black polythene
sheet (77.50 %), Organic mulch 9t/ha (74.70 %) and Organic mulch 6t/ha (65.30 %) treatment as compared to
control. In terms of percent increase in yield, Organic mulch 12t/ha caused highest increase (57.90 % over
control) followed by Black polythene sheet mulch, Black/Silver polythene sheet mulch, Black/White polythene
sheet mulch, Organic mulch 9t/ha and Organic mulch 6t/ha showing 47.49, 46.72, 45.17, 42.47 and 34.36
percent increase over control. P. latus showed non-transmissible nature of virus. Thus it indicated that mite is not
a carrier vector for transmission of leaf curl virus into chilli plant.
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