Phytotoxic and Insecticidal Activity of Plants of Family Zygophyllaceae and Euphorbiaceae

The statistical analysis revealed that 10g and 20g extracts of all the tested plants significantly inhibited the growth of Lemna minor with significant differences. The plants means were non-significant while the interaction between extracts and plants was significant. Fagonia cretica, Peganum harmala, Tribulus terrestris, Chrozophora tinctoria and Ricinus communis caused significant growth inhibition of Lemna minor in all the dilutions. The interaction between plants and dilution was non-significant. Among the three plants extracts, Peganum harmala showed the highest insects mortality followed by Fagonia cretica at the same dose. Tribulus terrestris showed the lowest mortality of Tribolium castaneum. All the doses (5 to 20%) of the plant extracts showed significant differences of mortality of T. castaneum as compared to control. The highest dose mean (12.8%) was shown by P. harmala, while the lowest dose mean was shown by T. terrestris.