Turnip seed (brassica napus)‎ extracts as grain wheat protectants against the granary weevil, sitopltilus granarius l.

Abstract EN

Turnip seeds, Brassica naps, were extracted by different solvents, and tested for their toxicities to the granary weevil, Sitophilus granaries L.

infesting wheat.

Petroleum ether, chloroform and acetone extracts, at a rate of 9 ml / kg seeds, showed 100 % mortality after 7 days.

Petroleum ether extract was the most potent, at both LC50 and LC95 levels, whereas other extracts were slightly less.

Reproductive capacity of the weevil was strongly affected, at the two levels of the tested extracts.

Complete protection (100 %) to grain wheat against S.

granaries L.

was achieved.

The residual effect was studied after different periods (from 1 to 8 weeks) from the time of treatment.

Results showed that chloroform extract gave a good protection for up to 7 weeks.

All the extracts reduced the germination of wheat grains at both their LC50 and LC95 values, at the time of treatment and after 7 weeks.

No marked effect of the tested extracts on the water inhibition by the grains was observed.

The initial effect of the extracts on the chlorophyll contents was variable ; after 7 weeks the results were more constantly high.

The tested extracts prove effective in controlling of S.

granaries L., with some adverse effect on the germination of the grains and on the chlorophyll contents of the wheat leaves.