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Subject: Zoology × Author: Geroh, Monika × End date: 2007 × Start date: 2007 × Type: Thesis ×
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    ThesisItemOpen Access
    Ecology and management of tetranychus urticae koch on okra, abelmoschus esculentus L.
    (CCSHAU, 2007) Geroh, Monika; Gulati, Rachna
    Studies on seasonal incidence of T. urticae revealed two peaks in its population on okra during first fortnight of June (25.69 mites/ sq. cm leaf) and during first fortnight of August (22.50 mites/ sq. cm leaf). Predatory beetle S. punctillum also showed two peaks; in the first fortnight of July (0.56 beetle/leaf) and second peak coincided with peak in T. urticae population, in the first fortnight of August (0.48 beetle/leaf). Strata wise, middle strata harboured significantly more number of mites and beetles followed by top and bottom strata. A significant positive correlation(r =0.88) was observed between mite and beetle population during the present study. With abiotic factors, T. urticae and S. punctillum population showed significant positive correlation with maximum and minimum temperature. Under in vitro conditions, direct spray bioassay showed smaller LC50 and LT50 values as compared to treated food bioassay. Under in vivo, P. pinnata oil (6.24%) was most effective which caused 82.3 percent reduction in T. urticae population followed by E. globulus oil @ 4.60% (76.1%), P. pinnata seed extract @ 9.68% (60.5%) and E. globulus leaf extract @ 3.92% (36.68%). All extracts/ oil were found safe to mite predator, S. punctillum.