ISHS Acta Horticulturae 785: International Symposium on Grape Production and Processing
ECOLOGY AND MANAGEMENT OF RED SPIDER MITE, TETRANYCHUS URTICAE KOCH ON GRAPE |
| Authors: | D. Chandra Sekhar, D. Jagdishwar Reddy, S.J. Rahman, A. Ranga Reddy, V.V. Narendranath |
| Keywords: | grapevine, ecology, red spider mite, management |
| Abstract:
Studies on biology of red spider mite, Tetranychus urticae Koch (Acariformes: Tetranychidae) on Thompson Seedless grapevine indicated that the duration of different developmental stages of T. urticae were 3.68 days for eggs, 2.06 days for larvae, 0.74 days for I quiescent, 1.89 days for protonymph, 0.79 for II quiescent, 2.02 days for deutonymph and 0.84 days for III quiescent stages, respectively. The fecundity was 73.20 eggs/female, while pre-oviposition, oviposition and post-oviposition periods lasted for 1.96 days, 10.53 days and 2.48 days, respectively. The total developmental period from egg to adult was recorded as 12.03 days and longevity of male was 8.60 days and that of female was 14.60 days. The seasonal incidence of T. urticae in relation to abiotic factors and also chemical management of mite was studied on Thompson Seedless from November 2004 to April 2005 at an experimental plot, Maheshwaram, Ranga Reddy district, Andhra Pradesh, India. Maximum and minimum temperatures were found to be positively correlated with the population build up of the mite. Highest population of 22.11 to 25.45 mites/cm2 leaf area was observed between March and April 2005 when the temperature ranged between 35 and 37.3°C. Chemical management studies showed that abamectin at 2.70 g. a.i ha-1 was significantly superior over all other treatments with 92.65 percent population reduction over control and also recorded highest fruit yield 26757 kg ha-1. The other treatments in descending order of their efficacy were fenazaquin 125 g. a.i. ha-1 (90.82%), difenthiuron 300 g. a.i. ha-1 (89.29%), spiromecifen 120 g. a.i.ha-1 (87.31%), milbemectin 5 g. a.i. ha-1 (86.48%) and dicofol 231 a.i. ha-1 (79.82%). | |
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