Three
synthetic botanical materials which are Camphour, Menthol and Thymol were
prepared as suitable fromulations: Camphour as 25% emulsifable concentrate,
both Menthol and Thymol as 20% concentrated emulion. Prepared formulations
sprayed on tomato plants at concentrations 1.0, 1.5 and 2.0% (V. /V.). Direct
effect on present 2^nd and 4^th instar larvae of cotton
leafworm was determined by takeing tomato leaves samples directly after
spraying and introducing these leaves samples to larvae in laboratory, for
studying latent effect,treated leaves samples were taken each two days and
introduced to the rest alive larvae ,mortality counts was recorded each two
days,then mortality percentages were calculated.Residual effect was determined
by the same method mentioned before,by taking leaves samples after 7 days of
treatment and introduchngto larvae in laboratory, other samples  taken each two days and introduced to the
rest alive larvae. Antifeedent effect also was determined by determination the consumed
amount of treated tomato leaves and untreated, then reduction percentage in
food consumed was calculated.    Results
obtained indicated that the tested matrials at all tested concentrations showed
hightoxic effect directly against the present larvae or residual after7days
against new infestation if occurred .Also, the tested materials showed
antifeedent effect against 4^th instar larvae to be more than 50% at
1% concentration. For economic consideration,concentration 1% could be
recommended for controlling larvae of cotton leafworm infested tomato.