ABSTRAK<br />Kepik renda lada (KRL), Diconocoris hewetti (Dist.) (Hemiptera:<br />Tingidae) adalah salah satu hama pada pertanaman lada di Indonesia.<br />Penelitian bertujuan untuk membandingkan berbagai parameter kehidupan<br />dan demografi KRL pada dua varietas lada. Pengaruh varietas lada<br />terhadap parameter kehidupan dan demografi KRL diteliti di rumah kasa<br />dan pertanaman lada di Pulau Bangka, sejak Oktober 2003 hingga Februari<br />2004. Penelitian mencakup pengaruh varietas Chunuk dan LDL terhadap<br />masa perkembangan telur dan nimfa, lama hidup imago jantan dan betina,<br />serta keperidian. Selain itu juga diteliti pengaruh fase bunga, pucuk daun,<br />dan buah muda terhadap lama hidup imago. Pengaruh varietas terhadap<br />berbagai parameter demografi KRL dipelajari dengan memelihara kepik<br />dari sejak telur hingga imago yang muncul meletakkan telur kembali.<br />Hasil penelitian menunjukkan bahwa perbedaan varietas mempengaruhi<br />berbagai parameter kehidupan KRL. Lama perkembangan nimfa 17,3 dan<br />13,0 hari, lama hidup imago jantan 10,2 dan 18,8 hari, lama hidup imago<br />betina 13,6 dan 16,9 hari, keperidian 13,9 dan 24,5 butir, berturut-turut<br />pada varietas Chunuk dan LDL. Imago KRL hidup lebih lama pada bunga<br />fase-3 dibandingkan pada bunga fase-1 atau-2. Laju pertambahan intrinsik<br />(r) 0,0741 dan 0,0827; laju reproduksi bersih (Ro) 6,98 dan 8,52, masa<br />generasi (T) 26,21 dan 25,91; laju pertambahan terbatas (λ) 1,0769 dan<br />1,0862 berturut-turut pada varietas Chunuk dan LDL. Secara keseluruhan,<br />varietas LDL lebih mendukung kehidupan dan perkembangan populasi D.<br />hewetti. Jika tidak tersedia bunga lada KRL mampu bertahan hidup dengan<br />mengisap pucuk daun dan buah muda. Lama hidup imago 12,1 hari dan<br />23,5 hari pada buah muda. Implikasi dari hasil penelitian ini adalah<br />informasi dasar dalam penelitian untuk pengendalian KRL.<br />Kata kunci: Lada, Piper nigrum L., hama, kepik renda lada, Diconocoris<br />hewetti, parameter kehidupan, demografi, Propinsi Bangka<br />Belitung<br />ABSTRACT<br />Life parameters and demographic of bug peper lace<br />Diconocoris hewetti (Dist.) (Hemiptera: Tingidae) on two<br />pepper varieties<br />Pepper lace bug (PLB), Diconocoris hewetti (Dist.) (Hemiptera:<br />Tingidae), is one of the insect pests attacking pepper in Indonesia.<br />Research was conducted with the objective to compare various life history<br />and demographic parameters of PLB on two pepper varieties. The effect<br />of two pepper varieties on various life parameters and demographic of<br />PLB was conducted in green house and farmer field on Bangka Island,<br />since October 2003 to February 2004. The experiment covered the effect<br />of LDL and Chunuk varieties on eggs and nymphal development, male<br />and female adults longivity and fecundity. Besides the effect of<br />development stage on inflorescence, shoots and young berries to adults<br />longivity were observed. The effect of varieties to demographic parameters<br />of PLB was studied by rearing the bugs since egg to adult laid eggs. The<br />result revealed that difference variety was influenced life history and<br />demographic parameters of PLB. Nymphal development time of PLB were<br />17.3 and 13.0 days, male adult longivity 10.2 and 18.8 days, female adult<br />longivity 13.6 and 16.9 days, fecundity 13.9 and 24.5 eggs per female,<br />respectively on Chunuk and LDL. The life history of PLB adult was longer<br />on stage-3 inflorescences than stage-1 or stage-2. The intrinsic rates of<br />increase (r) were 0.0741 and 0.0827, net reproductive rate (Ro) 6.98 and<br />8.52, mean generation time (T) 26.21 and 25.91 days, finite rate of<br />increase (λ) 1.0769 and 1.0862 on Chunuk and LDL<br />respectively.Generally, variety LDL was much better food source for the<br />development of D. hewetti. If there were no inflorescences available, the<br />PLB was able to survive by feeding on shoots or young berries. Adult<br />longivity was 12.1 days on shoots and 23.5 days on young berries. The<br />implication of this research is as the basic information in the next research<br />for PLB control.<br />Key words : Pepper, Piper nigrum L., pest, lace bug, Diconocoris hewetti,<br />life parameters, demographic, Bangka Belitung Province
Age-dependent effects of moderate differences in environmental predictability forecasted by climate change, experimental evidence from a short-lived lizard (Zootoca vivipara)
