EFEKTIVITAS MINYAK JARAK PAGAR DAN JAMUR Beauveria bassiana UNTUK PENGENDALIAN HAMA Helopeltis spp . PADA KAKAO / Effectivity of jatropha oil and Beauveria bassiana fungi to control Helopeltis spp. on Cacao

Abstract

<p>The oil of jatropha seeds has a potency as botanical pesticide, because of its chemical subtances which are unsaponifiable such as streoester, tryacycerol, diacilglicerol, sterol, monoacilglycerol and others. The chemical substances which are toxic to insect are sterol and triterpene alcohol. The other substance in fruits and seeds which is also toxic is curcin. The objective of this research is to find out the efectivity of jatropha cake and oil on mortality of Helopeltis spp. combined with commercial B. bassiana. Two factors were used in this activity i.e. accessions of Jatropha curcas and strains of B. bassiana. Accession factors consist of nine levels based on phorbol ester and curcin, as B. bassiana consists of three strains, so there were 27 combinations of treatments. The research used factorially block design with three replications. Variables observed were damage intensity, mortality of helopeltis and the effect on cacao seeds and B. bassiana development. The formulation contained 20% of jatropha oil or cake, 60% of solvent, 10% of emulsifiers and others. This formula was diluted in water with 10% concentration. The result of the research were a) Jatropha oil and cake had the same effect on insect mortality b) the combination between two accessions of jatropha (C100 and JW) and ED7 resulted 97-100% mortality, while c) B80 and C81 gave the highest mortality on Helopeltis spp. without the use of fungi.</p>