Laboratory and field experiments were conducted in Plant Protection
Research Institute and at Fayoum district, Fayoum Governorate during 2001 - 2002
seasons. This study aimed to investigate the efficiency of a selective safe substances,
leaves extracts of castor plant with three solvents varied in their polarity (petroleum
ether) hexane and water) and plant oil (Castor seed oil) for controlling the cotton aphid
Aphis gOSSYPl1 (Glover) and the spider mile Tetranychus utticee (Koch). Four
concentrations of plant extracts and plant oil were used. Mortality percen ages were
recorded after 1,2,3,5 and 7 days. The obtained data indicated that the mortality of the cotton ap~'d and the
spider mite are increased by increasing the concentration. After one day 0 treatment
the castor bean oil showed the most potency followed by petroleum et er leaves
extract and water than with hexane showing the LCSO value of 14.719, 33.366, 45.561
and 45.803 on the spider mite, 1.0335, 2.3189, 2.1166 and 3.0900 on the cotton
aphid, respectively. Also, after seven days of treatment castor oil showed the most
potency followed by the leave extracts of castor plant with petroleum ther and
hexane than with water on the cotton aphid and the spider mite. Field data indicated that castor oil treatment appeared to be the most
effective against the populations of A. gossypii (Glover) and T. unics (Koch),
followed by petroleum ether, hexane, and water extracts during the ~o tested
seasons, respectively. The early and total yield of cucumber were increased in the
tested seasons from (0.48 and 0.5 to 0.7 and 0.75) and 0.9 and 1.2 to 2.7 and 2.75)         K9 of fruit I plant for castor seed oillrealment, respectively.                         \