الفهرس 
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Abstract
This investigation was conducted under the laboratory
conditions of Seed Technology Research Unit. Agriculture
Research Center, Mansoura Governorate during the period of
1997- 1999. The purpose was to asses the toxicity of ethanol
extracts of harrnala, blue gum, barnoof, neem leaves, neem
seeds and wormwood to Sitophilus oryzae (L.) and Sitophilus
grainarius (L.l’. And the effect of plant materials ethanol
extract (harrnala, blue gum, barnoof, neem ’eaves, neem seed
and wormwood) and its concentrat\ons, storage periods and
moisture content in wheat and corn grains on seed viability,
seedlings vigor, insect infestation percentage and seed dry
weight loss percentage. The tested wheat cultivar was (Sakha
69) and the tested corn cultivar was (single cross 10).
Factorial completely randomized design was used in this
study.
The studied factors were:
1- First experiment:
Ethanol extracts of harmala, blue gum, barnoof, neem
leaves, neem seeds and wormwood were prepared and used to
assess its toxicity effects on Sitophilus oryzae L, and
Sitophilus groinarius L..
2- Second eXDeriment:
.Plant materials ethanol extract and its concentrations:
Four concentrations ethanol (only), 2000 ppm, 4000
ppm and 8000 ppm) from ethanol extract of harrnala, blue
gum, barnoof, neem leaves, neem seeds and wormwood were
prepared and used as a seed protectants. Also, there were
grains without any treatment (control).