An insecticidal and acaricidal polysulfide metabolite from the roots of Petiveria alliacea
Johnson, L. | Williams, L.A.D. | Roberts, E.V.
The present study reports on the insecticidal and acaricidal potentials of dibenzyltrisulfide (DBTS) isolated from the roots of Petiveria alliacea L. using thin layer and high performance liquid chromatography. The 96-h LD50 value (microgram per tick) obtained for adult Boophilus microplus (Canestrini) topically treated with DBTS was 0.920. The LD50 values obtained for three commercial acaricides dimethoate, lindane and carbaryl were 4.6, 9.3 and 6.9 microgram per tick respectively. The IOD50 and IHD50 (concentrations inhibiting egg laying and hatching by 50% respectively) in microgram per tick doses for DBTS were 0.22 and 0.24 respectively. The 24-h LD50 dose (microgram per insect) obtained for DBTS on adult Cylas formicarius elegantulus (Summer) was 0.193 microgram per insect. The vapour from a stock solution of 5 g litre-1 of DBTS was highly toxic to adult Hypothenemus hampei Ferr. inside coffee berries, inflicting 89% mortality within 24 h.
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