in-vitro assessment of alliacin (alcoholic extracts of garlic, onion and leek) effect on red mite (dermanyssus gallinae)

Red mite control was usually based on organophosphates, carbamates and pyrethroids (1). due to the increased resistance to these toxins, the number of toxins currently used is limited. the use of plant compounds is an alternative approach for controlling mites (2,3). in the present study, the effect of alliacin (alcoholic extracts of garlic, onion and leek) and alcoholic extract of garlic, onion, leek and two-component compounds of garlic and onion, garlic and leek, onion and leek alcoholic extracts with concentration 1.5, 3, 7.5, 15 and 30% and cypermethrin with concentrations of 1, 2 and 4 ml per l for 36 hr at different time intervals (2,4, 6, 8, 10, 12, 24 and 36 hr) was examined on the chickens red mite. the results showed that cypermethrin only at a concentration of 4 ml per l after 24 and 36 hr of exposure was able to kill 20.66 and 29.66% of mites, respectively. alliacin at a concentration of 30% was able to kill 86.66 and 96.66% of mites in 24 and 36 hr, respectively. the best results were related to the two-component compounds of garlic and leek alcoholic extract and garlic and onion alcoholic extract at a concentration of 30%, in 12 hr could kill 95% and 86.66%, and eliminate 98.33 and 100% of red mites in 24 hr, respectively. due to resistance of red mite to chemical toxins, alliacin and the two-component compounds of garlic, onion and leek extract could be used as alternatives to eliminate red mite.