BIONOMICS AND CONTROL OF RED SPIDER MITE, Tetranychus lombardinii BAKER AND PRITCHARD (ACARI: TETRANYCHIDAE) INFESTING JASMINUM SPP.
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Date
2017-07-20
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The crimson spider mite, Tetranychus lombardinii infested jasmine crop, more
particularly Jasminum sambac in 11 districts of Karnataka. In Bangalore, J. sambac
harboured more number of mites (12.72 mites/twig of 6-8 leaves) compared to J.
multiflorum & J. grandiflorum (10.39 to 10.95). Mite activity showed gradual increase
from August onwards recording a peak of 23.24 mites in Nov. followed by low intensity
peaks (10-11mites) in Feb. & April. Mite development in the laboratory was faster (24.85
- 8.74 days for female; 24.26 to 7.37 for male) as rearing temperature increased from
20℃ to 35℃. Life cycle was shortest (7.37 days for male & 8.74 for female) at 35℃.
Life cycle was shortest (7.62 to 22.37 days for male; 9.04 to 23.86 for female) on J.
sambac at all temperature (20℃- 35℃) & relative humidity (71-88%) conditions.
Longevity, oviposition period, fecundity and sex ratio declined (22.61 to 7.96 days, 18.68
to 4.27 days, 49.24 to 16.12 eggs/female and 1:13.6 to 1:4.3) as rearing temperature
increased from 20℃ to 35℃. Mite also preferred J. sambac for reproduction vis-a-vis J.
multiflorum & J. grandiflorum. Life table data were generated at four constant rearing
temperatures on Jasminum spp. Intrinsic rate of natural increase, rm (female
offsprings/female/day) was relatively high when reared between 25℃ & 30℃ (0.153 to
0.191 & 0.165 to 0.189, respectively). Relative toxicity of acaricides (based on LC50
values) to T. lombardinii was, Hexythiazox (0.11ppm)> Fenpyroximate (0.14)>
Fenazaquin (0.42)> Fenpropathrin (0.56)> Buprofezin (0.83)> Spiromesifen(0.95)>
Dicofol (1.49)> Propargite (4.49)> Diafenthurion (8.80). The Order of field residual
toxicity (based on LT50 values) was, Spiromesifen (17.12 days)> Fenazaquin (14.54)>
Fenpyroximate (14.08)> Propargite (13.98)> Dicofol (13.63)> Hexythiazox (12.92)>
Buprofezin (12.52)> Fenpropathrin (12.43)> Diafenthiuron (11.73).
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