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Articles by Endang Sri Ratna
Total Records ( 3 ) for Endang Sri Ratna
  Resti Rahayu , Intan Ahmad , Endang Sri Ratna , Marselina I. Tan and Nova Hariani
  Six strains of German cockroach, Blattella germanica, collected from three major cities in Indonesia which are Jakarta, Bandung and Surabaya were bio-assayed with topical application to monitor insecticide resistance to insecticides propoxur, permethrin and fipronil. In general, compared with VCRU susceptible strain as the standard, all cockroach strains were resistant to all insecticides tested, with Resistance Ratios ranging from 2.11-1013.17 fold. Majority of strains exhibited very high resistance (RR50>50) to permethrin; this study also revealed the existence of extremely high resistance to permethrin (RR50 of 1013.17 fold) in HHB-JKT strain. Resistance levels to both propoxur and fipronil is vary (RR50 ranging from 2.11-44.72 fold). But, in general, the field strains are still susceptible to fipronil. This study is the second report of German cockroach resistance to insecticides in Indonesia which suggest the importance of continued monitoring of insecticides susceptibility for controlling the German cockroach, B. germanica. In addition, the findings can be used in formulating potential strategies for cockroach resistance management.
  Sulaeha Th , Aunu Rauf , Purwantiningsih and Endang Sri Ratna
  Background and Objective: Melon fly, Zeugodacus cucurbitae (Coquillett) (Diptera:Tephritidae), is a major agricultural pest in Indonesia. It is considered a specialist insect since it only attacks plants that belong to the family Cucurbitaceae. Such insects commonly use plant semiochemicals to find appropriate hosts for feeding and oviposition. The objective of this study was to identify chemical compounds from the host plants that were attractive to male and female Zeugodacus cucurbitae (Z. cucurbitae). Materials and Methods: Chemical blends were extracted from the host plants and responses of the melon fly to the scents were studied by Y-olfactometer. Results: Fractions of bitter gourd (Momordica charantia) were more attractive to male and female Z. cucurbitae compared to those of angled luffa and cucumbers. Compounds extracted from the leaves of bitter gourd after saponification were identified as a ketone (6,10,14-trimethyl-2-pentadecanon), an aldehyde (3,7,11,15-tetramethyl-2-hexadecen-1-ol) and phytosterol. Conclusion: The ketones and the aldehydes are kairomones for Z. cucurbitae.
  Murni Indarwatmi , Dadang , Sobir and Endang Sri Ratna
  Background and Objective: The cocoa mealybug Exallomochlus hispidus (Morrison) is a quarantine pest on mangosteen. Gamma irradiation is a possible phytosanitary control treatment. This research investigated the lethal and sublethal gamma irradiation doses for controlling Exallomochlus hispidus (E. hispidus) and the impact of irradiation on mangosteen fruit quality. Methodology: Nymphs and adult females of E. hispidus were exposed to gamma irradiation (50-2000 Gy and a control) and newly emerged females were exposed to a sublethal dose of 50-400 Gy. Mangosteen fruit was irradiated at 250-1000 Gy. Reproductive development, longevity and fecundity of irradiated females were observed. The physical and chemical qualities of irradiated fruit were assessed. Results: The LD99 for the first, second and third instar nymphs and adults were 423.7, 1026.0, 1276.0 and 1934.5 Gy, respectively. Irradiation doses of 50-400 Gy on adult females resulted in significantly longer pre and post birth periods but shorter birth period. These doses also increased the longevity and decreased the fecundity, observed as 99.7% unhatched eggs and 0.3% undeveloped nymphs. The quality of mangosteen fruit did not effect by irradiation unless the red color retain and vitamin C content of fruit was significantly decreased. Conclusion: The result indicates that irradiation is an effective phytosanitary treatment to control E. hispidus on mangosteen. Irradiation doses of 250 Gy are recommended for phytosanitary treatment without degradation of fruit quality.
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