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Subject: Zoology × Author: Monika ×
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    ThesisItemOpen Access
    Evaluation of management practices against Polyphagotarsonemus latus (Banks) and its role as vector of leaf curl virus in chilli
    (CCSHAU, 2018) Monika; Gulati, Rachna
    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.