Pustaka Ilmiah Universitas Padjadjaran

Abstrak

Resistance Status Of Crocidolomia Pavonana F. (Lepidoptera : Crambidae) From Pasirwangi Garut, West Java To The Insecticide Profenofos And Its Susceptibility To The Methanolic Leaf Extract Of Nicotiana Tabacum L. (Solanaceae)

This research was conducted to determine the resistance status of Crocidolomia pavonana to the synthetic insecticide profenofos and to know the toxicity of leaf extract of tobacco (Nicotiana tabacum) against C. pavonana. The study used two bioassay methods, dry film and feeding assay. C. pavonana larvae was obtained from Sirnajaya, Karyamekar, and Padasuka village, Pasirwangi district, Garut, West Java, Indonesia. A standard susceptible strain of C. pavonana larvae (more than 20 generation in the laboratory) was used as comparison. The results of this study showed that C. pavonana from all villages (Karyamekar, Sirnajaya, Padasuka) indicating slight resistance (1 < RR =5) to profenofos with Resistance Ratio (RR) values of 1.04, 1.65, and 1.20, respectively (dry film method) and 1.23, 1.86, and 1.42 (feeding assay). These results suggest that the resistance mechanism of C. pavonana in these populations occur mainly in the insect alimentary canal. On the other hand, the field population of C. pavonana had a RR to tobacco leaf extract of less than one (0.92 in Sirnajaya; 0.89 in Karyamekar; 0.90 in Padasuka) suggesting that the larvae of C. pavonana tested were not resistant to the tobacco leaf extract.