EVALUATION THE EFFICIENACY OF SOME PLANT EXTRACTS IN BEHAVIORAL AND BIOLOGICAL RESPONSE OF KHABRA BEETLE Trogoderma granarium (EVERTS) (COLEOBTERA: DERMESTIDAE)

Abstract

A several laboratory experiments were conducted to evaluate the efficacy of some aqueous extracts of plants (thyme, mint, green tea, rosemary) on third and adult larvae of Trogodema granarium in laboratory conditions. The results were superior to the aqueous extracts of thyme at concentrations (1, 5 and 10%) compared to the aqueous extracts of other plants, and the following results were obtained:

1- As the mortality rat e increased with the increase in the concentration of the extract and the duration of exposure compared to the control sample, where the rate of larvae killing of thyme extract after 8 days was for concentrations (1,5,10% and control) (1.6, 2.0, 6.6, 1.0) respectively, and for mint plant After 8 days (3.6, 3.3, 4.3, 1.0) respectively, the larval killing rate of rosemary extract after 8 days was (1.6, 3.0, 3.0, 1.0) respectively, and the killing rate of green tea extract after 8 days (1.0, 1.6) , 2.6, 1.0).

2- The extract of thyme, mint and rosemary showed a high response to the repellency effects, while green tea gave a lower response, and this effect increases with the increase in the concentration of the extract and the duration of exposure to it. The response rate of thyme extract after 8 days to concentrations (1, 5, 10 %) (86.6, 93.3, 96.6%), respectively, and the percentage of the repellency to aqueous extract of rosemary was (80, 83.3, 83.3) respectively, and the repellency of the aqueous extract of the mint plant was (90, 90, 93.3%) respectively, and the repellency of the aqueous extract of the green tea plant was (56.6, 63.3, 73.3%) respectively.

3- The percentage of loss weight was high for the control sample treated with solvent only (water + distilled water), while the percentage of loss was low for the samples treated with plant extracts under study. Where the percentage of loss of wheat treated with aqueous extract of thyme when using concentrations (1%, 5%, and 10%) reached (5%, 2%, and 0.8%), respectively. And for wheat treated with aqueous extract of mint, which amounted to (11%, 7.8%, and 2.3%) respectively. And for wheat treated with aqueous extract of rosemary using concentration (1%, 5%, and 10%) was (10.1%, 6.8% and 3.0%) respectively. And for wheat treated with extract of green tea was (12.8%, 11.3% and 7.6%), respectively.

4- Percentage of germination efficiency test was assessed after treating wheat seeds with different concentrations of extracts used in this study (thyme, mint, rosemary, green tea). The germination percentage ranged between (95 - 99%), where the percentage of the control treatment was 97%. The highest germination rate was when using thymeplant at a concentration (1%, 5%, and 10%). And the lowest germination rate was when using green tea at a concentration of 10%, reaching 95%.