الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Red spider mites are one of the most important acaricides which cause large agricultural losses. In this study, different extracts of seeds of linseed, neem and garlic were prepared and their ability to kill red spider mites and protect plants from mite injury were evaluated. The results showed that neem hexane extract caused a complete mortality to all red spider after 24 h of treatment followed by neem ethanolic extract and garlic ethyl acetate extract. Also. Linseed aqueous extract and neem hexan extract inhibited acetyl cholinesterase (AChE) by 46.4% and 41.6% respectively compared to control.
In addition protease activity was declined due to treatment with 5000 ppm linseed ethyl acetate extract and garlic aqueous extract by 92.27% and 86.91% respectively compared to control. The results clearly indicated that infection of green bean seedlings with red spider mites led to high levels of electrolyte leakage and lipid peroxidation and treatment of infected green beans with linseed aqueous extract and neem ethyl acetate extract showed the lowest level of electrolyte leakage and lipid peroxidation.
Phenolic compouns and (PAL) were increased in green bean leaves due to the infection with red spider mites by 64.6% and 84.4% respectively. All treatments caused significant reduction in phenolic contents in infected leaves.
The results indicated a significant increase in proline contents by 59.7% and all treatments caused a significant reduction in proline content and the lowest level of prolines were recorded in the leaves treated with neem ethyl acetate extract.
The enzyme activites of Polyphenol oxidase activity (PPO), peroxidase activity (POX) and catalase activity (CAT) were increased by 38.4% , 136% and 101% respectively compared to non infected control and all treatments caused a significantly reduction in the activities of PPO, POX and CAT except linseed ethyl acetate extract which exhibited a significantly increase in PPO activity.
Our results concluded that these plant extract can be used as a natural acaricide with high levels of environmental safety and efficiency.