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Influence of Weather Factors on Seasonal Population Dynamics of coelaenomenodera elaeidis(Coleoptera: Chrysomelidae) and Its Natural Enemies in NIFOR, Nigeria

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American Journal of Plant Sciences 2014年第1期5卷 42-47页

作者： T. I. Aneni C. I. Aisagbonhi B. N. Iloba V. C. Adaigbe C. O. Ogbebor Department of Animal and Environmental Biology University of Benin Benin City Nigeria Entomology Division Nigerian Institute for Oil Palm Research Benin City Nigeria

The leaf miner (coelaenomenodera elaeidis) is the major pest of the oil palm. Seasonality of C. elaeidis, its natural enemies and their relationship with temperature, rainfall and relative humidity were observed between January 2009 and December 2010 at the main station of the Nigerian Institute for Oil Palm Research. Leaf miner population estimates were obtained from NIFOR entomology division from 1976-1980. This study analyses temporal patterns in leaf miner abundance, and elucidates general patterns and factors influencing leaf miner abundance. Multiple linear regressions were used to analyse the relationship between abundance of leaf miner, its parasitoids and predators and the following climatic variables: maximum and minimum temperature (°C), rainfall (mm) and relative humidity (%). Climate variables from the month of pest collection (control variable) or from the month before collection (delayed variable) were used. The abundance of leaf miner and predatory ants peaked in the dry season, while parasitoids were most abundant in the rainy season. Significant correlations (P ≤ 0.05) were found between leaf miner, its natural enemies and both control and delayed weather variables. For all years, maximum temperature was the most dominant for all the leaf miner stages. This indicates that the weather variables at both the month of collection and with a delayed month in relation to collection are critical for pest-weather evaluation and important for leaf miner control. Temperature, rainfall and relative humidity had an effect on the population of C. elaeidis, and this effect is manifested primarily in seasonal fluctuations in oil palm agroecosystems. Weather influenced the seasonal population dynamics of C. elaeidis, facilitating early season build-up on the oil palm host crop. Dry season months with resultant higher temperatures recorded higher population of C. elaeidis.

关键词： Seasonality coelaenomenodera elaeidis Oil Palm Weather Variables Pest Management

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Fluctuations in Natural Populations of the Leaf miner (coelaenomenodera lameensis) in Relation to Different Origins of Oil Palm (Elaeissp.) in South Benin

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American Journal of Plant Sciences 2013年第9期4卷 1846-1852页

作者： A. Coffi R. Philippe I. Glitho Centre de Recherches Agricoles Plantes Pérennes (CRA-PP) Institut National de Recherches Agricoles du Bénin (INRAB) Pobè Bénin Centre International de Recherche Agronomique pour le Développement Montpellier France Laboratoire d’Entomologie Appliquée Faculté des Sciences Université de Lomé Lomé Togo.

Preferences of different oil palm crosses in the station of Pobè in Benin were tested on coelaenomenodera lameensis by monitoring the natural population for 7 consecutive years. Experiments monitoring of developmental stages of the insect were performed on material types Elaeis guineensis and Elaeis oleifera. Observations were performed every two weeks on leaves of different ranks (25, 17 or 9) depending on the degree of defoliation by counting the different stages of insect development on leaflets. The results showed that the evolution of pest density is a function of species and the origin of the materials being compared. Population densities of different stages of C. lameensis were more abundant in the crosses from Yocoboué where average population indices were higher at all stages of development from early observations. By contrast, in crosses La Mé, Yangambi and Deli, the numbers of larvae, pupae and adults were lower. Among these three crosses infestation was more abundant in La Mé, followed by Yangambi and Deli. E. oleifera is much less or not attacked. The stages of development (larvae and adults) were also differently held in oil palm origins in comparison. The larval population is significantly important during the short rainy season and lesser important during the dry season. These results may contribute to the development of suitable materials for the genetic improvement of breeding tolerant oil palm material to leaf miner.

关键词： coelaenomenodera lameensis Leaf Miner Oil Palm Elaeis spp

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