Effect of datura stramonium and legeum spartum extracts on some productivity characters of the mulberry silkworm, Bombyx mori L.
2009
Lotfy, L.A.S. | Yousif-Khalil, S.I. | Desuky, W.M.H. | Helaly, M.M.Y.
Summarized data are as follows: *Applying ethanolic and chloroform extracts of D. strumonium during 4th instar resulted in producing heavier fresh cocoon weight (0.910 and 0.941g), respectively. The same trend was also recorded for the cocoons resulted from 5th instar larvae treated with chloroform extracts of the two plants. Other extracts were nearly similar to the control (0.850g). _ Feeding 5th instar larvae on chloroform extracts of datura and halfa, as well as chlorpyrifos methyl increased significantly pupal weight. _ Applying chloroform extract of D. stramonium during the 5th instar and chlorpyrifos methyl treated larvae increased significantly cocoon shell weight. The highest silk ratio was detected for 4th instar larvae treated with chloroform extract of L. spartum (19.0%) and for 5th instar with ethanolic extracts of D. stramonium (18.29%). Significant elongation in the reelable silk filament length was realized with all the tested extracts, as it ranged 778.21 - 884.59 m for 4th instar treated and 700.65-757.67 m for 5th instar treated larvae compared to 622.98 and 704.14m, recorded for the control of 4th and 5th instars, respectively. * treating 4th instar larvae with the extracts of the plants in chloroform caused significant increase in the filament weight.
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