Distribution and Incidence of the Oil Palm Weevil Rhynchophorus phoenicis (Fabricius, 1801) (Coleoptera: Curculionidae) in Selected Agro-Ecological Zones of Uganda

Baguma, John; Otema, Milton A.; Ddamulira, G.; Naluyimba, R.; Egonyu, James P.

doi:10.4001/003.027.0477

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…It seems therefore that the other two palm weevil species (R. quadrangulus and R. ferrugeneus) reported in West-Central and North Africa, respectively (CABI, 2019;Chebbi, 2011;Hill, 2008), have not yet spread to Kenya and Uganda. Contrary to Baguma et al (2019) who were unable to detect incidence of R. phoenicis in Bugiri-Uganda, we recorded the presence of this species at this site. These discrepancies can be attributed to the methods used in sampling by the two studies, thus demonstrating the superiority of semiochemical lures in detecting occurrence of Rhynchophorus spp.…”

Section: Discussioncontrasting

confidence: 99%

“…We established that traps placed on oil palms approximately 100 m away from the natural forest without raffia palms caught 6-fold more R. phoenicis than those at the periphery of the forest. This finding corroborates that of Baguma et al (2019) who documented higher incidence of R. phoenicis symptoms on oil palms located 100 m away from the forest than those positioned at its periphery. Low pest density near undisturbed natural forest might be attributed to rich plant diversity with suitable microclimates which could boost the build-up of natural enemies of the pests (Altieri, 1999;Letourneau et al, 2011).…”

Section: Discussionsupporting

confidence: 90%

“…In Kenya, Kwale is among the major coconut palm production areas, involving largely small holder producers (Kadere et al, 2009;Odenya et al, 2006); whereas Busia is famous for oil palm production (Odenya et al, 2006). In Uganda, Mayuge, Bugiri, Mukono and Masaka districts have research adaptive oil palm trial farms sized 1-17 ha (Baguma et al, 2019); whereas Kalangala district has over 14,000 ha of oil palms (Carrere 2013;Vegetable Oil Development Project, 2016). Ages of the trees across sites were variable and not determined, as was the case with environmental conditions.…”

Section: Study Sitesmentioning

confidence: 99%

“…In Mukono district where the oil palm plantation was surrounded by a thick natural forest with undetermined plant species, the plantation was subdivided into two subsites, the peripheral zone within 15 m outside the forest, and the centre of the plantation, which was approximately 100 m away from the forest. This subdivision was guided by the report by Baguma et al (2019) that the symptoms of R. phoenicis at this site were higher on oil palms positioned 100 m away from the forest than those within 15 m outside the forest. At Kalangala district, the study site comprised an oil palm plantation which was adjacent to wild raffia palms.…”

Section: Study Sitesmentioning

confidence: 99%

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Trapping, identification and rearing of edible palm weevils in Kenya and Uganda

Egonyu

Gitonga

Khamis

et al. 2021

JIFF

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Palm weevils, Rhynchophorus spp. (Coleoptera: Curculionidae) double as devastating invasive pests of palms, and delicacies in many communities. This study evaluated ethyl acetate and 3-methyl-octan-4-ol for trapping palm weevils from coconut, oil and raffia palms in Kenya and Uganda; taking into account the distance of traps on oil palm from a forest or raffia palm. Eggs from the weevils from different locations were incubated and their larvae reared on sugarcane under laboratory conditions. All the 285 weevils collected were identified by morphological and molecular techniques as Rhynchophorus phoenicis, and the catch was female-biased. 3-methyl-octan-4-ol attracted more weevils than ethyl acetate. More weevils were caught at ~100 m away from the forest than within 15 m outside the forest; and on raffia palm than oil palm irrespective of distance apart. Eggs took ~4 d to develop and 95-100% of pupae developed into adults, irrespective of the collection site. Larval and pupal developmental periods for weevils from Uganda were longer than those of Kenya, resulting in egg-adult development of ~6 months and ~4 months, respectively. The sex ratio of laboratory produced males and females was similar. These results can guide in designing an integrated R. phoenicis management system with a dual benefit of protecting palms from weevil attack and utilising the weevils to improve human nutrition.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 90%

Section: Study Sitesmentioning

confidence: 99%

Section: Study Sitesmentioning

confidence: 99%

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Trapping, identification and rearing of edible palm weevils in Kenya and Uganda

Egonyu

Gitonga

Khamis

et al. 2021

JIFF

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“…Pests: The major pest that constrains oil palm production in Uganda is the oil palm weevil, Rhynchophorus phoenicis [36]. At the nursery stage, chewing Lepidopteran larvae including the armyworm have been identified.…”

Section: Challenges In Oil Palm Productivity In Ugandamentioning

confidence: 99%

Challenges and Opportunities of Oil Palm Production in Uganda

Amugoli¹,

Masika²,

Asiimwe³

et al. 2023

Palm Oil - Current Status and Updates

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Oil palm, a lucrative vegetable oil crop in the world, showed promising adaptability to some agroecologies in Uganda from studies carried out in the 1970s resulting in first commercial establishment in 2005 in Bugala Island, Kalangala district. Further, adaptability studies continue to reveal suitable areas for commercial oil palm production in the country. The infant industry faces an array of challenges, both biotic and abiotic especially in regard to smallholder farmer field management and build-up of pests and disease in the face of climate change both in the nuclear estate and smallholder farmers’ fields. The rapid build-up of devastating diseases such as Fusarium wilt of oil palm and Ganoderma trunk rot in Uganda is an interesting scenario since they are often expected from second-phase plantings in other areas in the world. However, it may be attributed to the all-year-round weather suitability to pests and disease build-up on native or alternative hosts in most agroecologies in Uganda. This difference from other oil palm producing regions in the world has resulted in recently initiated oil palm Research in Uganda to focus on developing local solutions to challenges facing oil palm farmers in the country.

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A multi-scale approach to study palm-weevils in a tropical agroecosystem

Vásquez-Ordóñez,

Torres-López,

Monmany-Garzia

2024

Landsc Ecol

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Context The recent phytosanitary crisis caused by the stem borer weevils Dynamis borassi and Rhynchophorus palmarum in peach palms (Bactris gasipaes) seriously affects the economy of rural families in Colombia. To understand the possible ecological mechanisms favoring the pest, the weevil-palm system needs to be studied from a multi-scale perspective. Objectives We evaluated the combined effects of agricultural management, landscape, topography, soil, and climate variables on infestation levels of peach palm caused by the weevils D. borassi and R. palmarum in the Colombian southwest to understand underlying ecological drivers of the current phytosanitary crisis. Methods The palm infestation levels (response variable) and local agronomic practices were recorded in 32 sites across Colombia's Pacific, Andes, and Amazon natural regions. For each peach palm crop, landscape variables were estimated from classified Sentinel-2 images, soil variables were extracted from the Soil Grids 250 m database, and climate variables were extracted from the CHIRPS and CHIRTS databases. Explanatory variables were analyzed using Generalized Linear Models and Partial Least Squares-Generalized Linear Models. Results Landscape variables, specifically the number and shape of non-forest patches, had a greater influence on peach palm infestation levels than other environmental variables, possibly related to the decrease in the density of Oenocarpus batatua, the natural palm host for D. borassi, leading it to switch to the peach palm. Conclusions A multi-scale approach of the weevil-palm interaction enabled us to identify an ecological mechanism that has not been proposed before. Our recommendation for families depending on peach palm is to design palm management with a landscape perspective that considers the conservation of alternative hosts for the weevils in agroforestal plots.

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Distribution and Incidence of the Oil Palm Weevil Rhynchophorus phoenicis (Fabricius, 1801) (Coleoptera: Curculionidae) in Selected Agro-Ecological Zones of Uganda

Cited by 9 publications

References 24 publications

Trapping, identification and rearing of edible palm weevils in Kenya and Uganda

Trapping, identification and rearing of edible palm weevils in Kenya and Uganda

Challenges and Opportunities of Oil Palm Production in Uganda

A multi-scale approach to study palm-weevils in a tropical agroecosystem

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