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STUDIES OF TURMERIC CURCUMA LOGNA AS PROTECTANT AGAINST INSECT PESTS OF STORED RICE

Ibrahim, Farzana (1997) STUDIES OF TURMERIC CURCUMA LOGNA AS PROTECTANT AGAINST INSECT PESTS OF STORED RICE. PhD thesis, University of Karachi, Karachi.

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Abstract

Turmeric Curcuma longa (L.) is a tropical herb of the family Zingiberaceae. Turmeric oil extracted with petroleum ether and chemical fractions of this oil obtained through column chromatography were systematically screened for repellent and growth inhibitory effects on Tribolium castaneum. Synergistic effects of applied to rice grain, bags or both and its comparison with existing pest control practices for the management of stored grains were also studied In repellency studies primary fractions CLPE 2 and CLPE 4 were the most promising showing 48.75 and 58.75 percent average repellency at 600 μg/cm2 against T. castaneum. Secondary fractions CLPE 2(B) and CLPE 4(@) showing 57.25 and 64.00 percent average repellency at 600 μg/cm2 were the most promising. Fractions CLPE 8 and CLPE 9 were the most promising growth inhibitors of T. castaneum. When fed on wheat flour containing 1000, 500 and 250 ppm of CLPE 8 the adults produced 55.25, 68.00 and 71.25 larvae as against 212.50 in control. Pupation and adult emergence was also significantly affected. Similarly CLPE 9 also caused a significant reduction in the progeny of T. castaneum. Studies on synergistic effects of neem oil and mustard oil alone and in various combinations on turmeric oil against T. castaneum and R. dominica indicated that turmeric oil when applied alone was more effective than in combination with other oils. However, in combinations higher proportion of turmeric oil had more effect on both insect species. In field evaluation turmeric oil application to rice grain, to bag or both had effects comparable with other pest control techniques such as application of grain protectant coopex and Polyethylene Enclosure and Phosphine Fumigation (PEPF), on the grain moisture, thousand grain mass, weeviled grain and population of major insect pests. Turmeric oil application to bag and coopex to grain caused significant reduction in weeviled grain in Dokri but not Thatta. Turmeric oil applications had higher grain moisture content than other treatments except PEPF. There was no significant increase of insect population in turmeric oil applications until 2 months. Maximum weeviled grain were 3.3 percent whereas in PEPF weeviled grain remained below 2% until 10 months but after 12 months it increased to the highest figure of 4.66 percent. There was no significant effect of any treatment on T. castaneum population of S. oryzae was higher in thatta Than in Dokri

Item Type:Thesis (PhD)
Uncontrolled Keywords:turmeric curcuma logna, insect, pests, rice, zingiberaceae, tribolium castaneum, turmeric oil
Subjects:Biological & Medical Sciences (c) > Biological Sciences(c1) > Paleo-zoology(c1.10)
ID Code:1200
Deposited By:Mr. Muhammad Asif
Deposited On:03 Jan 2007
Last Modified:04 Oct 2007 21:05

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