Laboratory and field tests of the effectiveness of the lemon-eucalyptus extract, Citridiol, as a repellent against land leeches of the genus Haemadipsa (Haemadipsidae).

摘要: Citridiol is an extract of the leaves Corymbia citriodora (Myrtaceae), lemon eucalyptus, and mostly consists p-menthane-3,8-diol isomers. The effectiveness this as a repellent against land leeches genus Haemadipsa (Haemadipsidae), primarily H. sylvestris, was tested in laboratory field, Peninsular Malaysia. formulation tested, Mosi-guard Natural spray, contained 40% (w/w) base ethanol, water isopropanol. In test, specimens sylvestris that were placed within moist, untreated arenas enclosed by treated paper rings made numerous attempts to cross but prevented or delayed from crossing over, dose-dependent manner. Mortality high among attempted over had been sprayed saturation point low only partially treated, with droplet-spray. field study carried out using indices formulated reflect severity leech attack degree repellency. Heavy moderate spraying footwear trouser legs (tucked into socks) not gave complete protection bites picta also provided enough repellency keep virtually free leeches. Even light spray greatly reduced numbers on their progression toward biting test subjects, although it failed prevent completely. There no decline when hourly assessments 6-h period field. results show highly well toxic leeches, can be effectively used