Flowering weeds can serve as refugia for natural enemies. In coffee plantation, they might have the potential to attract predator and parasitoid of Coffee Berry Borer (CBB), Hypothenemus hampei Ferr. (Coleoptera: Scolytidae). The aim of this research was to elucidate the influence of weeds to the presence of predator dan parasitoid and their impact to the population of CBB. The research was conducted at Ngantang, Malang Regency and in Laboratory of Entomology, Faculty of Agriculture, Brawijaya University. Three species of weed used were: Ageratum conyzoides L. (Asteraceae), Synedrela nodiflora(L.) Gaertn. (Asteraceae), and Arachis pintoi Krap. & Greg. (Fabaceae). The research consisted of two experiments (1) coffee plot with single species of weed and (2) coffee plot with two species of weeds. The results of experiment I and II showed that A. conyzoides, S. nodiflora, A. pintoi and its combination in coffee plantation significantly attracted the predator and parasitoid of CBB. The population of CBB was not significantly different between coffee plot with and without weed. The existence of A. conyzoides, S. nodiflora and A. pintoi in coffee plantations could increase the number of predator and parasitoid of CBB around coffee tree. This result showed that the presence of weeds in coffee plantation is an important factor in maintaining the predator and parasitoid of CBB population. Coffee is largely planted in Ngantang District, Malang Regency, where CBB is concerned as a main pest. Many coffee farmers in Ngantang do not use any insecticide to control CBB, making the possibility of natural enemies of CBB still remain in high diversity and number. However, farmers usually use herbicide to clean weeds in the coffee plantation especially several weeks before and during harvest season. We assumed that the using of herbicide might decrease natural enemies either in the diversity or the population. Van Emden and Williams (1974) stated that herbicide could reduce the diversity of weeds and the population of arthropods up to 50%. However, there is still less information about the influence of weeds in coffee plantation, more often their effect on the presence of predator and parasitoid of CBB. Therefore, we investigated the effect of weeds on species number and population of CBB predators and parasitoids during fruit season. We also studied the population of CBB in coffee plantation related to the existence of predators and parasitoids on weeds. We expected that this study could show the important of some weeds species in coffee plantation to conserve predators and parasitoids of CBB. How to Cite METHODSThis research was conducted in coffee plantation at Ngantang District, Malang, East Java and in the Laboratory of Entomology, Faculty of Agriculture, Brawijaya University. Two experiments were conducted on 1445 m 2 of coffee plantation. The field was divided into two blocks for those two experiments. Experiment I was to elucidate the influence of single weed species on the presence and population of natural enemies...
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