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Helopeltis antonii Sign.is one type of insect that often attacks cocoa plants in Indonesia. Therefore, it is necessary to find alternative insecticides that are more ecofriendly to minimize the bad effects that may result from long-term use. Botanical insecticides are an alternative that might be used. Cymbopogon nardus L. has active compound citronella while Nicotiana tabacum has an active nicotine compound, both of which are potential as plant insecticides and are biodegradable. This study consisted of 5 treatments, namely control (P0), a combination of C. nardus and N. tabacum (80 ml and 20 ml (P1); 60 ml and 40 ml (P2); 50 ml and 50 ml (P3); 40 ml. and 60 ml (P4), and 20 ml and 80 ml (P5)). The results showed the effect of C. nardus and N. tabacum extracts on the mortality of H. antonii. P0 mortality rate 3.33%; P1 of 26.70%; P2 of 26.70%; P3 was 67%, P4 was 80%, and P5 was 93.30%. The results of analysis of variance with ANOVA showed the effect of treatment and the results of the LSD test showed that the best treatment effect was at P5. Therefore, it can be concluded that the combination of C. nardus and N. tabacum extracts is effective as a botanical insecticide for H. antonii.

Kombinasi Ekstrak Cymbopogon nardus L. dan Nicotiana tabacum Sebagai Insektisida Nabati Helopeltis antonii Sign.