The Role of Mixing Different Plant Extracts to Boiled Linseed Oil for the Control of Whitefly Bemisia tabaci

Field experiments were conducted to study the effect of mixture botanical water extract of " capsicum + ginger "and" garlic + black pepper" with boiled linseed oil prepared as emulsifiable concentrate for controlling whiteflies Bemisia tabaci and aphids on squash leaves. The first boiled linseed oil formula contained capsicum and ginger extract, the second contained garlic and black pepper extract and the third was boiled linseed oil only. Each formula was tested at concentrations of "1.5%, 2.5% and 3.5%".Also 2.5% concentration of each formula was mixed with half the recommended rate of chlorpyrifos-methyl (CPM) "Reldan 50 % EC" which they has been mixed with boiled water "botanical extract" dilution. In the field all practiced formulations were compared with control and chlorpyrifos-methyl at recommended and half concentrations. In Water dilution four plants were boiled in first "capsicum + ginger" was boiled with cone. 1.7 % w/v and mixed with 1 ** formula in field and second water dilution" garlic + black pepper "was boiled with cone. 1.7 % w/v and mixed with 2,á formula in field, 3rd formula was mixed with normal water in field and insecticide full and '/2 rate was mixed with normal water also in field. In the laboratory experiments were conducted on eggs and immature stages. In the field experiment was conducted in November, 2006 and average number of insects was calculated per leaf for plants before spraying and after 1, 3, 5, 7 days from spraying. All the tested solutions of plant oil were passed successfully the emulsifibility test. The results revealed that all the tested materials exhibited reasonable insecticidal activity against all stages of whitefly. The best treatment against whitefly eggs was 2.5% from the third formulation + '/2 Reldan rate recorded 93.3 % reduction. The highest reduction percentage of whitefly nymphs was recorded with 2.5 % from the second formulation + '/2 Reldan rate (100 % reduction). The best treatment against whitefly adults was noticed with 2.5% from the first formulation combined with '/2 Reldan rate which recorded 87.0% reduction. It has been no improvement when adding ginger and glue to capsicum against whitefly adult stage in 11 / 2006 season compared with 11/ 2005 season, on the contrary for ginger and glue there has been improvement when adding black pepper and glue to garlic against whitefly adult stage in season 11/ 2006 compared by season 11/ 2005 by more than 20%, adding the glue for oil increased efficiency against whitefly adult stage in season 11 / 2006 compared by season 11 / 2005., All treatments achieved excellent results against aphids. Data also showed that the highest average weight for 3 squash plants with fruits was recorded at the treatment of 2.5 % from the third formulation (750 g) indicating 78.6, 130.6 and 30.4% over the control, Reldan (full rate) and '/2 Reldan rate, respectively. And there is improvement and advantage in boiling plants with field water dilution against whitefly adult stage. There is convergence between the results of laboratory and field "in most treatments". The full rate of insecticide caused scorching to the treated leaves and decreased the growth but half rate does not scorching leaves.