https://jopr.mpob.gov.my Tue, 10 Mar 2026 00:23:34 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/biology-and-behaviour-of-ielaeidobius-kamerunicusi-faust-1898-coleoptera-curculionidae-in-two-oil-palm-cultivars-in-colombia/ Mon, 25 Sep 2023 06:38:16 +0000 https://jopr.mpob.gov.my/?p=13136 Elaeidobius kamerunicus is the most efficient and abundant pollinator in oil palm plantations. We recorded biweekly observations to understand the population behaviour, habits and biological features of E. kamerunicus, as well as the volatile organic compound profile emitted by the inflorescences of two oil palm cultivars. Samples of the male and female inflorescences during the anthesis of Elaeis guineensis and the hybrid Coari × La Mé were collected. Elaeidobius kamerunicus adults copulated between 9:30 and 11:30 hr, and the females oviposited on the stamens of the male flowers. The life cycle of E. kamerunicus from egg to pupa took 8.6 days, and the life expectancy of adult males and females was 40.8 and 51.4 days, respectively. The female oviposition rate was 1.3 eggs/day, with a development time of 0.5 days. Insects such as Pachycondyla harpax, Hololepta sp., and members of the Chrysopidae and Dermaptera families, as well as spiders and Pseudoscorpiones, predated on this species. The main compounds emitted by the male and female inflorescences were methyl salicylate, estragole, cis-Anethole, and trans-Anethole studied in these two cultivars.

]]> https://jopr.mpob.gov.my/biology-and-population-dynamics-of-adult-isagalassa-validai-walker-1856-lepidoptera-brachodidae-the-oil-palm-root-borer-in-colombia/ Tue, 08 Aug 2023 03:08:41 +0000 https://jopr.mpob.gov.my/?p=13016 Sagalassa valida is a pest of economic importance because the larval stage feeds on the root system of the oil palm. In this investigation, the life cycle, the population dynamics of the adults, and their natural enemies were determined through biweekly samplings for 43 months in two lots of oil palm; located in the Central and Western Zone of Colombia. It was determined that the life cycle of S. valida is 64.1 days on average; the duration of each stage was: egg 9.2 ± 0.5 days, larva 38.1 ± 4.9 days (five instars), prepupa 2.9 ± 1.1 days, pupa 13.9 ± 1.1 days and adult 12.3 ± 4.3 days. The adults of S. valida were present in the two zones during the study; using Spearman’s correlation index, it was determined that in the Central Zone, the precipitation presented a direct and significant correlation with the variables: number of males (ρ = 0.24; P = 0.023) and the total number of adults (ρ = 0.21; P = 0.044). Ten natural enemies of S. valida and 14 weeds were identified in the study areas. This information is essential to implement an efficient management strategy for S. valida in plantations.

]]> https://jopr.mpob.gov.my/parasitoids-and-predators-of-insects-associated-with-oil-palm-elaeis-guineensis-jacq-in-india/ Tue, 16 Nov 2021 16:07:50 +0000 https://jopr.mpob.gov.my/V2/?p=10610 Oil palm nurseries and plantations in India were surveyed from April 1985 to February 1992 and 57 species of natural enemies of insects associated with the oil palm were recorded. These included 24 species of parasitoids, 17 species of predatory insects and 16 species of spiders. In the majority of the insects infesting the oil palm in India, native natural enemies could be found and the highest number of such natural enemies were reported on the diaspids encrusting fruits and leaves and the psychids causing defoliation. The role of these parasitoids and predators in naturally suppressing populations of limacodids, psychids and diaspids was highlighted. Infestations of the defoliating psychids and limacodids in Little Andaman Island were attributed to a lower incidence of parasitism by their natural enemies, thus augmenting these parasitoids from the main land in Little andaman Island is suggested.

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